阅读说明：本技术 一种用于深埋藏矿井缓冲吸能让压井壁结构 (Buffering, energy-absorbing and yielding well wall structure for deep-buried mine ) 是由 王剑波 姜明伟 刘焕新 张德琦 侯奎奎 王玺 郝英杰 程力 尹延天 范玉赟 刘兴 于 2021-08-13 设计创作，主要内容包括：本发明属于岩土工程技术领域,公开了一种用于深埋藏矿井缓冲吸能让压井壁结构,包括井筒外壁、井筒内壁以及吸能缓冲组件；所述吸能缓冲组件包括多个吸能缓冲管,均匀的竖向设置在井筒内壁与井筒外壁之间,且分别与井筒内壁与井筒外壁相接触,所述吸能缓冲管具有竖向中空结构,所述吸能缓冲钢管之间的间隙填充有弹性体；本发明能保证当井筒外壁受到外力时让压结构能吸收外壁传进来的作用力,减少周围土体压力对内壁的冲击保证内壁低压或者不受压,提高井筒结构安全性,确保深部井筒稳定性。(The invention belongs to the technical field of geotechnical engineering, and discloses a buffering, energy-absorbing and yielding well wall structure for a deep-buried mine, which comprises a well wall outer wall, a well wall inner wall and an energy-absorbing buffering assembly, wherein the energy-absorbing buffering assembly is arranged on the well wall outer wall; the energy-absorbing buffer assembly comprises a plurality of energy-absorbing buffer tubes, the energy-absorbing buffer tubes are uniformly and vertically arranged between the inner wall and the outer wall of the shaft and are respectively contacted with the inner wall and the outer wall of the shaft, the energy-absorbing buffer tubes are of vertical hollow structures, and gaps among the energy-absorbing buffer steel tubes are filled with elastomers; the invention can ensure that the yielding structure can absorb the acting force transmitted by the outer wall when the outer wall of the shaft is subjected to the external force, reduce the impact of the pressure of the surrounding soil body on the inner wall, ensure that the inner wall is low-pressure or not pressed, improve the safety of the shaft structure and ensure the stability of the deep shaft.)

1. A buffering, energy-absorbing and yielding well wall structure for a deep-buried mine is characterized by comprising a well shaft outer wall, a well shaft inner wall and an energy-absorbing buffering assembly; the energy-absorbing buffer assembly comprises a plurality of energy-absorbing buffer tubes, the uniform vertical arrangement is arranged between the inner wall and the outer wall of the shaft, the energy-absorbing buffer tubes are respectively contacted with the inner wall and the outer wall of the shaft, the energy-absorbing buffer tubes are of vertical hollow structures, and the elastic bodies are filled in gaps between the energy-absorbing buffer steel tubes.

2. The buffering, energy-absorbing and yielding borehole wall structure for the deep-buried mine as claimed in claim 1, wherein the energy-absorbing buffer tube is a hollow seamless steel tube.

3. The buffering, energy-absorbing and yielding well wall structure for the deep-buried mine as claimed in claim 2, wherein the cross section of the hollow seamless steel tube is a circular ring.

4. The buffering, energy-absorbing and yielding well wall structure for the deep-buried mine as claimed in claim 1, wherein the energy-absorbing buffer tube is a hollow open steel tube, and an opening is formed in a bus of the hollow steel tube.

5. The buffering, energy-absorbing and yielding well wall structure for the deep-buried mine as claimed in claim 4, wherein the cross section of the hollow open steel pipe is a major arc ring.

6. The buffering, energy-absorbing and yielding well wall structure for the deep-buried mine as claimed in claim 1, wherein the energy-absorbing buffer tube is a hollow seamless steel tube and a hollow open steel tube, the hollow steel tube bus has an opening, the hollow seamless steel tube and the hollow open steel tube are used for an asymmetric pressure well bore, and the lateral horizontal pressure applied to the position where the hollow open steel tube is arranged is greater than the lateral horizontal pressure applied to the position where the hollow seamless steel tube is arranged.

7. The buffer energy-absorbing yielding well wall structure for the deep-buried mine as claimed in claim 4, 5 or 6, wherein the opening direction is consistent with the tangential direction of the contact point of the hollow opening steel pipe and the outer wall of the well shaft.

8. The buffer energy-absorbing yielding well wall structure for the deep-buried mine as claimed in claim 7, wherein the angle range of the opening is greater than 0 ° and equal to or less than 30 °.

9. The buffering, energy-absorbing and pressure-yielding borehole wall structure for the deep-buried mine as claimed in claim 1, 2, 3, 4, 5, 6 or 8, wherein the central angle between adjacent energy-absorbing buffer tubes ranges from 10 ° to 30 °.

10. The buffering, energy-absorbing and pressure-yielding borehole wall structure for the deep-buried mine as claimed in claim 1, 2, 3, 4, 5, 6 or 8, wherein the elastomer is a polyurethane foaming agent.

Technical Field

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a buffering, energy-absorbing and yielding well wall structure for a deep-buried mine.

Background

The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The mine vertical shaft is used for carrying people and objects, ventilating, cooling and the like, is an essential link for safe and efficient production of mines, and is a life line of the mines. Since the 80 s of the last century, vertical shafts with deep and superficial soil layer sections are frequently subjected to non-mining damage accidents, with the increasing demand for mineral products in China, the well walls of many mine vertical shafts in China enter the kilometer stage, and a plurality of vertical shafts with the depth of more than 1500m are currently under construction.

The method of instant support can be adopted to prevent the well wall from being damaged in the construction process of the vertical shaft of the shallow-buried mine, and if the method is applied to the deep-buried well wall, the rock-soil pressure can not be released in time to cause the well wall to be damaged. In addition, the deep soil layer is easy to dehydrate and stabilize in the construction process of the shaft of the deep-buried mine vertical shaft, the surface soil layer around the shaft wall generates vertical displacement relative to the rigid shaft wall, and the interaction of the shaft wall and the surrounding surface soil layer generates additional pressure on the shaft wall and the larger horizontal pressure fractures the shaft wall.

At present, no good technical scheme is proposed for the current situation.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a buffer energy-absorbing yielding well wall structure for a deep-buried mine, which adopts a yielding technology, and a certain number of energy-absorbing buffer steel pipes are arranged between the inner wall and the outer wall of a well shaft to fully absorb the energy outside the well wall, so that the stability of the deep-buried well shaft can be ensured. In order to achieve the above object, the present invention is achieved by the following technical solutions:

the invention provides a buffering, energy-absorbing and yielding well wall structure for a deep-buried mine, which comprises a well wall outer wall, a well wall inner wall and an energy-absorbing buffering assembly, wherein the well wall outer wall is provided with a plurality of holes; the energy-absorbing buffer assembly comprises a plurality of energy-absorbing buffer tubes, the uniform vertical arrangement is arranged between the inner wall and the outer wall of the shaft, the energy-absorbing buffer tubes are respectively contacted with the inner wall and the outer wall of the shaft, the energy-absorbing buffer tubes are of vertical hollow structures, and the elastic bodies are filled in gaps between the energy-absorbing buffer steel tubes.

Further, the energy-absorbing buffer tube is a hollow seamless steel tube.

Further, the cross section of the hollow seamless steel pipe is a circular ring.

Furthermore, the energy-absorbing buffer tube is a hollow open steel tube, and an opening is formed in a bus of the hollow steel tube.

Further, the cross section of the hollow open steel pipe is an optimal arc ring.

Furthermore, the energy-absorbing buffer tube is a hollow seamless steel tube and a hollow open steel tube, an opening is formed in a bus of the hollow steel tube, the hollow seamless steel tube and the hollow open steel tube are used for an asymmetric pressure shaft, and the lateral horizontal pressure applied to the position of the hollow open steel tube is larger than the lateral horizontal pressure applied to the position of the hollow seamless steel tube.

Further, the opening direction is consistent with the tangential direction of the contact point of the hollow opening steel pipe and the outer wall of the shaft.

Further, the opening has an angular range of greater than 0 ° and equal to or less than 30 °.

Further, the central angle between adjacent energy-absorbing buffer tubes ranges from 10 degrees to 30 degrees.

Further, the elastomer is a polyurethane foaming agent.

The beneficial effects of the invention are as follows:

(1) the invention provides an energy-absorbing yielding structure used between the inner wall and the outer wall of a shaft of a vertical shaft, which is characterized in that a certain number of energy-absorbing buffer steel pipes are arranged between the inner wall and the outer wall of the shaft, so that the energy outside the shaft wall can be fully absorbed, the yielding structure can be ensured to absorb the acting force transmitted by the outer wall when the outer wall of the shaft is subjected to an external force, the impact of the pressure of the surrounding soil body on the inner wall is reduced, the low pressure or no pressure of the inner wall is ensured, the safety of the shaft structure is improved, and the stability of the deep shaft is ensured.

(2) The invention allows the outer wall of the shaft to generate certain deformation during supporting, the outer wall is subjected to external pressure and energy and is transmitted to the energy-absorbing buffer steel pipe, and the energy is absorbed by the yielding structure, so that the invention can fully play the yielding and energy-absorbing functions of the structure, reduce the use amount of concrete of the shaft wall structure and reduce the supporting cost.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention. It will be further appreciated that the drawings are for simplicity and clarity and have not necessarily been drawn to scale. The invention will now be described and explained with additional specificity and detail through the use of the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view illustrating a buffering, energy-absorbing and yielding well wall structure of a deep-buried mine according to the present invention;

FIG. 2 is a schematic longitudinal sectional view showing a buffering, energy-absorbing and yielding well wall structure of a deep-buried mine according to the invention;

FIG. 3 shows an enlarged partial view of the crush feature of the present invention;

FIG. 4 illustrates a diagram of a borehole wall computational mechanics model;

figure 5 shows a schematic diagram of the borehole wall support pressure.

In the figure: the method comprises the following steps of 1, 2, 3, 4, a polyurethane foaming agent, 5 and 6, wherein the outer wall of a shaft, the inner wall of the shaft, the cross section of the hollow seamless steel pipe is a circular ring, and the cross section of the hollow seamless steel pipe is a hollow opening steel pipe with a circular ring.

Detailed Description

The technical solution in an exemplary embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention.

When the well wall is not damaged and normally used, the stress state of the well wall structure is an elastic stress state, and the well wall in deep surface soil is subjected to lateral horizontal pressure of soil bodies 5 around the well wall and vertical additional force caused by drainage under the drainage state. The influence of temperature change on the stress of the well wall is not considered, the following mechanical calculation model is established, fig. 4 is a well wall computational mechanical model diagram, and the diagram shows the lateral soil pressure P (Z) and the uniformly distributed hydrophobic vertical additional force P_V。

As described in the background art, the deep soil layer is easy to dehydrate and stabilize in the construction process of the vertical shaft of the deep-buried mine, the surface soil layer of the soil body 5 around the shaft generates vertical displacement relative to the rigid shaft wall, and the interaction between the shaft wall and the surface soil layer around the shaft generates additional pressure on the shaft wall (at the moment, because of P, the surface soil layer is easy to dehydrate and stabilize in the construction process of the vertical shaft of the deep-buried mine_VThe effect of which can increase the lateral horizontal pressure of the soil mass 5 around the shaft) plus the larger lateral horizontal pressure of the soil mass 5 around the shaft itself fractures the well wall.

The embodiment provides a buffering, energy-absorbing and yielding well wall structure for a deep-buried mine, which comprises a well wall outer wall 1, a well wall inner wall 2 and an energy-absorbing and buffering assembly, as shown in fig. 1 and 2; energy-absorbing buffer assembly includes a plurality of energy-absorbing buffer tubes, and even vertical setting is between pit shaft inner wall 2 and pit shaft outer wall 1, and contacts with pit shaft inner wall 2 and pit shaft outer wall 1 respectively, and energy-absorbing buffer tube has vertical hollow structure, and the clearance packing between the energy-absorbing buffer steel pipe has the elastomer.

Further, the central angle between adjacent energy-absorbing buffer tubes ranges from 10 degrees to 30 degrees.

According to the structure, a certain number of energy-absorbing buffer tubes are arranged between the inner wall 2 of the shaft and the outer wall 1 of the shaft, so that the energy outside the shaft wall can be fully absorbed, the acting force transmitted from the outer wall 1 of the shaft can be absorbed by the yielding structure when the outer wall 1 of the shaft is subjected to external force, the impact of the lateral horizontal pressure of the soil body 5 around the shaft on the inner wall 2 of the shaft is reduced, the low pressure or no pressure of the inner wall of the shaft is ensured, the safety of the shaft structure is improved, and the stability of the deep shaft is ensured.

In addition, the elastomer filler can fix the energy-absorbing buffer tube on one hand, and can be matched with the energy-absorbing buffer tube to fully absorb external energy to resist deformation on the other hand. The preferred elastomer is polyurethane foaming agent 4, and the polyurethane foaming agent 4 has certain rigidity after being solidified and also has waterproofness.

The principle of the 'yielding method' support is shown in fig. 5, wherein the earth pressure is firstly, the borehole wall pressure with a buffer structure is secondly, the borehole wall pressure without a buffer structure is thirdly, and the earth pressure after the earth is unstable is fourthly. The well wall with the buffering energy-absorbing structure is designed, and the pressure A of a well wall working point is smaller than the pressure of a working point B, so that the safety of the well wall is ensured.

As shown in fig. 3, the energy-absorbing buffer tube in this embodiment is a hollow open steel tube, and the hollow steel tube bus has an opening, but it is understood that the cross section of the hollow open steel tube may be an elliptical ring, a square ring, a polygonal ring, etc. with an opening, and preferably, a hollow open steel tube 6 with a cross section of a perfect arc ring is used, and the opening direction is consistent with the tangential direction of the contact point of the hollow open steel tube and the outer wall 1 of the wellbore.

Further, the angular range of the opening is greater than 0 ° and equal to or less than 30 °.

In some embodiments, the energy-absorbing buffer tube is a hollow seamless steel tube, although it is understood that the cross-section of the hollow seamless steel tube can be oval, square, polygonal, etc., and preferably, a hollow seamless steel tube 3 with a circular cross-section is used.

The hollow open steel pipe 6 with the cross section being the major arc ring has larger elasticity due to the open structure, can buffer larger pressure and is mainly used for the position with larger lateral horizontal pressure, and the hollow seamless steel pipe 3 with the cross section being the circular ring has no open structure and does not have larger elasticity due to the non-open structure, can buffer smaller pressure and is mainly used for the position with smaller lateral horizontal pressure.

In some embodiments, the energy-absorbing buffer tube is a hollow seamless steel tube and a hollow open steel tube, the hollow steel tube bus has an opening, the hollow seamless steel tube and the hollow open steel tube are used for a pressure asymmetric wellbore, and the lateral pressure applied to the position where the hollow open steel tube is arranged is greater than the lateral pressure applied to the position where the hollow seamless steel tube is arranged.

Simulation example 1

Most of the surface of the coal mine field is covered by loess of the fourth system, and a main well and an auxiliary well are arranged in the industrial square. The shaft structure adopts the compound wall of a well of reinforced concrete in the topsoil section, adopts the freezing method to construct in the loose stratum section wall of a well, and main shaft pit shaft passes fourth series topsoil layer, and this section comprises sandy clay, gravel layer and clay layer, and wherein the sand layer is main aquifer, and its aquifer characteristics are the loose good sandy soil of water permeability of structure, and this simulation is this section aquifer wall of a well. The physical and mechanical parameters of the well wall and the energy-absorbing steel pipe are shown in the table 1.

TABLE 1 model physical mechanical parameters

The model takes the upward direction of a shaft as a Y axis, the length of the Y axis is 30m, the left boundary and the right boundary are restricted in the X direction and 9m in the X direction, the front boundary and the back boundary are restricted in the Z direction and 9m in the Z direction, the lower boundary is all restricted in X, Y, Z, the upper boundary is a pressure boundary, boundary load is applied, and the magnitude of the applied force is 15MPa according to calculation.

The outer radius of the shaft outer wall 1 is 4.5m, the inner radius of the shaft outer wall 1 is 4.4m, the wall thickness of the shaft outer wall 1 is 0.1m, the outer radius of the shaft inner wall 2 is 4.0m, the inner radius of the shaft inner wall 2 is 3.8m, the wall thickness of the shaft inner wall 2 is 0.2m, a plurality of hollow open steel pipes 6 with cross sections of 0.4m and major arc rings are arranged between the shaft inner wall 2 and the shaft outer wall 1, the central angle between two adjacent steel pipes is 22.5 degrees, the opening angle is 20 degrees, the thickness of each steel pipe is 0.1m, the numerical simulation calculation model is a coulomb-mole model, the steel pipes are simulated by unit bodies and are endowed with proper parameters, and gaps between the steel pipes are filled with foaming filling agents.

Simulation example 2

Different from the simulation example 1, the simulation example is a traditional well wall, a hollow open steel pipe 6 with a cross section of a major arc ring is not arranged in the middle, the thickness of the simulated outer wall is 0.4m, and the thickness of the simulated inner wall is 0.3 m.

After the models are built, initial ground pressure calculation is respectively carried out on the two models, the number of the calculation steps is 20000, after the initial ground pressure calculation is finished, physical and mechanical parameters are respectively given to carry out calculation, and the parameters are shown in table 1. The model cannot be continuously calculated after about 500 steps of calculation of the traditional well wall model, which shows that the calculation cannot be converged due to collapse of the well wall, although the steel pipe of the well wall model supported by the energy-absorbing steel pipe is greatly deformed, the well wall is not obviously deformed, the model can be completely calculated, and finally the deformation of the well wall is 180mm, so that the better supporting effect of the energy-absorbing steel pipe is embodied.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.