阅读说明：本技术 一种立井井筒过富水煤层段安全掘进防治水保护方法 (Water prevention and control protection method for safe excavation of water-rich coal seam section of vertical shaft ) 是由 王春刚 方刚 高栓文 刘洋 王宇 梁向阳 徐圣集 黄浩 李博 魏瀚昆 武永强 于 2020-05-15 设计创作，主要内容包括：本发明公开了一种立井井筒过富水煤层段安全掘进防治水保护方法,包括以下步骤：S1：立井井筒马头门与其上方40m之间的区域为待注浆堵水区域,对待注浆堵水区域内的壁间及壁后环形空间进行充填注浆；S2：在待注浆堵水区域周边施工一定数量的疏水泄压钻孔；S3：对富水煤层内待掘马头门两帮及迎头影响范围内施工一定数量的注浆孔,采用水泥基注浆料对煤层裂隙进行注浆改造,形成注浆改造区域；S4：对注浆改造区域施工检查孔,通过单孔压水试验、出水量、注浆圈内外水压差综合分析注浆效果,不满足要求的通过检查孔进行补充注浆。本发明经济投入相对较少,工期较短,有助于矿井加快基础设施建设的时间要求。(The invention discloses a water prevention and control protection method for safe excavation of a water-rich coal seam section of a vertical shaft, which comprises the following steps: s1: the area between the ingate of the vertical shaft and the area 40m above the ingate is a water plugging area to be grouted, and annular spaces between walls and behind the walls in the water plugging area to be grouted are filled and grouted; s2: constructing a certain number of drainage pressure relief drill holes at the periphery of a water plugging area to be grouted; s3: constructing a certain number of grouting holes in the water-rich coal seam within the influence range of the two sides of the to-be-dug horse head and head-on, and performing grouting transformation on the coal seam crack by adopting cement-based grouting material to form a grouting transformation area; s4: and (3) comprehensively analyzing the grouting effect through a single-hole water pressure test, the water yield and the difference between the internal water pressure and the external water pressure of the grouting ring for the grouting reconstruction area construction inspection hole, and performing supplementary grouting through the inspection hole which does not meet the requirements. The invention has relatively less economic investment and shorter construction period, and is favorable for the time requirement of accelerating the infrastructure construction of the mine.)

1. A protection method for preventing water in a vertical shaft over-water-rich coal seam section during safe tunneling is characterized by comprising the following steps: the method comprises the following steps:

s1: the area between the ingate of the vertical shaft and 40m above the ingate is a water plugging area to be grouted, and annular spaces between walls and behind the walls in the water plugging area to be grouted are filled with grouting to avoid the rise of water level after coal bed water is plugged and accelerate the unfreezing speed of the freezing holes and the freezing walls of the upper freezing layer section;

s2: constructing a certain number of drainage pressure relief drill holes at the periphery of a water plugging area to be grouted, reducing the coal bed water pressure in the water plugging area to be grouted by concentrated drainage and interception, and playing a role in drainage grouting in the grouting process;

s3: constructing a certain number of grouting holes in the water-rich coal seam within the influence range of two sides and head-on of a to-be-dug horse head, performing grouting transformation on coal seam cracks by adopting cement-based grouting materials to form a grouting transformation area, adopting a full-hole section grouting method in the single-hole grouting process, drilling holes in sandstone of a coal seam top plate, and arranging a water-stop sleeve in the sandstone;

s4: and (3) comprehensively analyzing the grouting effect through a single-hole water pressure test, the water yield and the difference between the internal water pressure and the external water pressure of the grouting ring for the grouting reconstruction area construction inspection hole, and performing supplementary grouting through the inspection hole which does not meet the requirements.

Technical Field

The invention belongs to the technical field of vertical shaft construction, and particularly relates to a water prevention and control protection method for safe excavation of a water-rich coal seam section of a vertical shaft.

Background

In the process of construction of a coal mine shaft in China, in order to prevent an underground water-bearing layer section from entering a tunneling working face to influence safe production, a freezing method construction process is usually adopted to freeze the stratum and then perform shaft tunneling, the cost is high, and due to the design depth problem, particularly the vertical shaft, the whole shaft section is often difficult to freeze. In the northwest elm area of Jurassic coal field in the Erdos basin of China, the existence of a water-rich coal bed is discovered in recent years, and further, the problem of water hazard related to the construction and production processes of mines is brought. In the prior knowledge, the coal seam section is considered to be a compact water-free sediment body, and in the construction process of a mine in an area, the design construction is carried out according to the prior vertical shaft tunneling, and the whole section of the shaft is not frozen, so when the shaft is tunneled to the coal seam section of the shaft, water inrush occurs, the field drainage capability is limited, and the threat to the safety of the mine and personnel is brought.

Disclosure of Invention

The invention aims to provide a water prevention and control protection method for safe excavation of a water-rich coal seam section of a vertical shaft, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a vertical shaft water-rich coal seam section safe tunneling water prevention and control protection method is structurally characterized in that: the method comprises the following steps:

s1: the area between the ingate of the vertical shaft and 40m above the ingate is a water plugging area to be grouted, and annular spaces between walls and behind the walls in the water plugging area to be grouted are filled with grouting to avoid the rise of water level after coal bed water is plugged and accelerate the unfreezing speed of the freezing holes and the freezing walls of the upper freezing layer section;

s2: constructing a certain number of drainage pressure relief drill holes at the periphery of a water plugging area to be grouted, reducing the coal bed water pressure in the water plugging area to be grouted by concentrated drainage and interception, and playing a role in drainage grouting in the grouting process;

s3: constructing a certain number of grouting holes in the water-rich coal seam within the influence range of two sides and head-on of a to-be-dug horse head, performing grouting transformation on coal seam cracks by adopting cement-based grouting materials to form a grouting transformation area, adopting a full-hole section grouting method in the single-hole grouting process, drilling holes in sandstone of a coal seam top plate, and arranging a water-stop sleeve in the sandstone;

s4: and (3) comprehensively analyzing the grouting effect through a single-hole water pressure test, the water yield and the difference between the internal water pressure and the external water pressure of the grouting ring for the grouting reconstruction area construction inspection hole, and performing supplementary grouting through the inspection hole which does not meet the requirements.

Compared with the prior art, the method has the advantages of relatively less economic investment and shorter construction period, and is favorable for meeting the time requirement of accelerating the infrastructure construction of the mine.

Drawings

FIG. 1 is a plan view of a vertical shaft ingate pressure relief borehole arrangement of the present invention;

FIG. 2 is a cross-sectional view of a vertical shaft ingate pressure relief borehole design of the present invention;

FIG. 3 is a schematic view of a vertical shaft ingate pressure relief borehole opening of the present invention;

FIG. 4 is a plan view of a vertical well bore ingate grouting borehole arrangement of the present invention;

FIG. 5 is a cross-sectional view of a vertical shaft ingate grouting borehole design of the present invention;

FIG. 6 is a schematic diagram of the vertical shaft ingate grouting drilling hole opening position of the invention;

FIG. 7 is a schematic diagram of the expected effect of vertical shaft ingate grouting water plugging of the present invention;

FIG. 8 is a plan view of the effect of the bridgehead door curtain grouting of the auxiliary vertical shaft of the bravamin coal mine;

FIG. 9 is a schematic sectional view showing the grouting effect of a bridgehead curtain of the auxiliary vertical shaft of the bravamin coal mine.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-7, the invention provides a technical solution, a method for protecting water prevention and control during safe excavation of a water-rich coal seam section of a vertical shaft, comprising the following steps:

s1: the area between the ingate of the vertical shaft and 40m above the ingate is a water plugging area to be grouted, and annular spaces between walls and behind the walls in the water plugging area to be grouted are filled with grouting to avoid the rise of water level after coal bed water is plugged and accelerate the unfreezing speed of the freezing holes and the freezing walls of the upper freezing layer section;

s2: constructing a certain number of drainage pressure relief drill holes at the periphery of a water plugging area to be grouted, reducing the coal bed water pressure in the water plugging area to be grouted by concentrated drainage and interception, and playing a role in drainage grouting in the grouting process;

s3: constructing a certain number of grouting holes in the water-rich coal seam within the influence range of two sides and head-on of a to-be-dug horse head, performing grouting transformation on coal seam cracks by adopting cement-based grouting materials to form a grouting transformation area, adopting a full-hole section grouting method in the single-hole grouting process, drilling holes in sandstone of a coal seam top plate, and arranging a water-stop sleeve in the sandstone;

s4: and (3) comprehensively analyzing the grouting effect through a single-hole water pressure test, the water yield and the difference between the internal water pressure and the external water pressure of the grouting ring for the grouting reconstruction area construction inspection hole, and performing supplementary grouting through the inspection hole which does not meet the requirements.

Referring to fig. 8-9, the method is applied to the stallion grouting water plugging project of the sublevel vertical well of the bravamin coal mine in the northwest Jurassic coal field elm, and achieves good application effect. By the related drilling and grouting method, the plugging engineering of the water-rich coal seam in the area is successfully realized for the first time. The total water inflow of the auxiliary vertical shaft of the mine is from the initial 150m³H (up to 200 m)³H) decay to the current 11m³And the grouting water plugging rate is 93%, and the construction is carried out from the mine water prevention angle, so that the shaft can be ensured to continue to carry out safe tunneling construction.

The mines in the elm cross north area are all self-contained well fields, most of the mines are basically in exploration and construction stages at present, various facilities of unproductive mines are not perfect, particularly mine drainage systems, water treatment systems and the like, the mineralization degree of mine water and deep underground water is high, the discharged mine water pollutes the environment, but the rich water of the mine coal seam needs to be drained, so the grouting method provided by the invention is adopted for preventing and treating the water hazard of the coal seam, the multiple problems of the built mines in the area can be solved, the mines enter the production stage after various facilities of the mines are complete, the requirements of discharging a large amount of underground water, treating the mine water and the like can be met, and the water hazard of the coal seam can be discharged for a long time to meet the requirements of safe production. Compared with the freezing method construction, the method has the advantages of relatively less economic investment, shorter construction period and contribution to the time requirement of accelerating the infrastructure construction of the mine.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.