阅读说明：本技术 一种严寒地区土密度的测试设备及方法 (testing equipment and method for soil density in severe cold region ) 是由 薛兆锋 晁刚 程文东 房建宏 黄阿妮 马亮 冶炯 于 2019-10-10 设计创作，主要内容包括：本发明公开了一种严寒地区土密度的测试设备及方法,该设备包括排液筒、铁板和泄水管,所述排液筒高度为50cm,泄水管的排液口距地面高40cm,所述铁板焊接在排液筒底部。本发明还提供了一种严寒地区土密度的测试方法。本发明的严寒地区土密度测试装置有效的避免了传统冻土密度联合测定法试验中排液管装置在工程实际试验测试中的缺陷,实现了严寒地区地质勘查中冻土密度的准确测试,保证了现场土密度试验数据的准确性。为地质勘查的科学性和严谨性提供了保障。该测试装置可直接用于冻土及岩性土密度测试。(The invention discloses a device and a method for testing soil density in severe cold regions, wherein the device comprises a liquid discharge cylinder, an iron plate and a water drain pipe, the height of the liquid discharge cylinder is 50cm, the distance between a liquid discharge port of the water drain pipe and the ground is 40cm, and the iron plate is welded at the bottom of the liquid discharge cylinder. The invention also provides a method for testing the soil density in the severe cold area. The soil density testing device for the severe cold area effectively avoids the defects of a liquid discharge pipe device in the traditional frozen soil density joint measurement method test in the engineering actual test, realizes the accurate test of the frozen soil density in the geological survey of the severe cold area, and ensures the accuracy of the field soil density test data. And guarantee is provided for the scientificity and the rigor of geological exploration. The testing device can be directly used for testing the density of frozen soil and lithologic soil.)

1. the device for testing the soil density in the severe cold area is characterized by comprising a liquid drainage cylinder (1), an iron plate (2) and a drain pipe (3), wherein the height of the liquid drainage cylinder (1) is 50cm, the distance between a liquid drainage port of the drain pipe (3) and the ground is 40cm, and the iron plate (2) is welded at the bottom of the liquid drainage cylinder.

2. The apparatus for testing soil density in severe cold regions according to claim 1, wherein the thickness of the iron plate (2) is 3 mm.

3. The soil density testing device for severe cold regions is characterized in that the contact opening of the drain pipe (3) and the drainage cylinder (1) is a circle with the diameter of 5 cm.

4. The soil density testing device for severe cold regions according to claim 1, wherein the outer opening of the drain pipe (3) is a 2cm circle.

5. A method for testing soil density in severe cold regions is characterized by comprising the following steps:

Step 1, taking 1000-1500g of rock sample and weighing;

Step 2, slowly pouring clear water at the temperature close to 0 ℃ into the drainage cylinder to enable the water surface to exceed the top of the drain pipe, slowly descending the water surface in the drainage cylinder, and weighing the quality of the drainage cylinder and water when the water surface is stable and the drain pipe does not discharge water any more;

Step 3, gently placing the core sample into a drainage cylinder, enabling water in the drainage cylinder to flow into a measuring cylinder, immediately weighing the quality of the drainage cylinder, the water and the sample after water flow stops, and simultaneously measuring and reading the volume of the water in the measuring cylinder to check the volume of the core sample;

Step 4, when the rock core sample is fully dissolved into a loose state in the drainage cylinder, clarifying, adding clear water to enable the water surface to exceed the drain pipe, and weighing the quality of the drainage cylinder, water and soil particles after water flow stops;

And 5, keeping the water surface stable in the test process, wherein the liquid discharging cylinder cannot shake during water discharging and rock core sample placing.

6. The method for testing soil density in severe cold regions according to claim 5, wherein the soil density calculation method is operated according to relevant specification requirements.

Technical Field

The invention belongs to the technical field of highway geotechnical tests and relates to a device and a method for testing soil density in severe cold regions.

Background

In severe cold areas, the temperature is severe cold in winter and long in duration, the temperature is short and cool in summer, the temperature is relatively high, the freezing period is long, the solar radiation amount is large, and the sunshine is rich; it is often accompanied by strong wind. In the geological exploration process of severe cold areas, due to special geological conditions and climatic environments, frozen soil is often encountered in the exploration process, and a frozen soil sample testing device specified in industry specifications cannot completely meet the actual requirements on site, such as a soil density testing device and the requirements in a frozen soil density joint measurement method test of highway geotechnical test regulations, wherein a liquid discharge pipe device of a testing instrument consists of a liquid discharge cylinder, a siphon, a water stop clamp, a frozen soil sample and a measuring cylinder.

in geological exploration in severe cold areas, due to the special climatic environment, strong wind is often accompanied on site, a liquid discharge cylinder base given by highway geotechnical test regulations is in a round shape with the diameter of 15cm, in the site test in the strong wind environment, the stability of a test device can not meet the site test requirement, if the liquid discharge cylinder swings left and right, the accuracy of test data is seriously influenced, and even the collapse phenomenon of test equipment is generated; meanwhile, the diameter of a siphon pipe in the liquid discharge pipe device is small, and in a field frozen soil density test, after multiple tests, water in a liquid discharge cylinder is turbid and is accompanied by suspended particles and rotten vegetation, so that the siphon pipe is blocked at the position of a siphon opening in the liquid discharge cylinder, the discharge of the water in the liquid discharge cylinder during the test is influenced, and the accuracy of the measurement of the volume of discharged water in the test is greatly influenced. In the market of road instrument equipment sale, a liquid discharge cylinder in a liquid discharge pipe device sold and used is basically similar to the prior art, and the requirements of a frozen soil density field test in geological exploration in a severe cold region cannot be met; thirdly, in the frozen soil core soil density test in geological exploration, if the frozen soil test sample is small, the frozen soil test sample is not representative, and therefore the volume of the test sample is not suitable to be too small. Meanwhile, after 2-3 soil sample tests, the soil sample in the liquid discharge cylinder can not be melted in a short time, the accumulated height of the soil sample in the liquid discharge cylinder reaches more than 20cm, the usable height of the liquid in the liquid discharge cylinder is 30-13 cm-17 cm, the requirement of repeated use can not be met, and in engineering field tests, due to the limitation of conditions, the standby of clean water in the liquid discharge cylinder is very difficult, so that the working efficiency of the field test is greatly reduced. In summary, the joint determination of the density of the frozen soil given in the road geotechnical test regulations requires a large gap from the actual test of the density of the frozen soil in the severe cold area, and the device for testing the density of the frozen soil, which meets the requirements of the road geotechnical test regulations and is suitable for the severe cold area, is urgently required by testers for actual engineering application.

Disclosure of Invention

the invention aims to overcome the defects in the prior art, and provides a device and a method for testing soil density in severe cold regions.

The specific technical scheme is as follows:

The testing equipment for the soil density in the severe cold region comprises a liquid drainage cylinder 1, an iron plate 2 and a water drain pipe 3, wherein the height of the liquid drainage cylinder 1 is 50cm, the distance between a liquid discharge port of the water drain pipe 3 and the ground is 40cm, and the iron plate 2 is welded at the bottom of the liquid drainage cylinder.

Further, the thickness of the iron plate 2 is 3 mm.

Further, the contact opening of the drain pipe 3 and the drain cylinder 1 is a circle having a diameter of 5 cm.

Further, the outer opening of the drain pipe 3 is a 2cm circle.

Further, the iron plate 2 has a diameter of a circle of 30 cm.

Further, the diameter of the drainage cylinder is 15 cm.

A method for testing soil density in severe cold regions comprises the following steps:

Step 1, taking about 1000-1500g of rock sample and weighing.

And 2, slowly pouring clear water at the temperature of approximately 0 ℃ into the drainage cylinder to enable the water surface to exceed the top of the drainage pipe, slowly descending the water surface in the drainage cylinder, and weighing the quality of the drainage cylinder and the water when the water surface is stable and the drainage pipe does not discharge water any more.

And 3, gently placing the core sample into the drainage cylinder, enabling water in the drainage cylinder to flow into the measuring cylinder, immediately weighing the quality of the drainage cylinder, the water and the sample after the water flow stops, and simultaneously measuring and reading the volume of the water in the measuring cylinder to check the volume of the core sample.

And 4, when the rock core sample is fully dissolved into a loose state in the liquid discharge cylinder, clarifying, adding clear water to enable the water surface to exceed the water drain pipe, and weighing the mass of the liquid discharge cylinder, water and soil particles after water flow stops.

And 5, keeping the water surface stable in the test process, wherein the liquid discharging cylinder cannot shake during water discharging and rock core sample placing.

further, the soil density calculation method is operated according to the relevant standard requirements.

Compared with the prior art, the invention has the beneficial effects that:

the soil density testing device for the severe cold area effectively avoids the defects of a liquid discharge pipe device in the traditional frozen soil density joint measurement method test in the engineering actual test, realizes the accurate test of the frozen soil density in the geological survey of the severe cold area, and ensures the accuracy of the field soil density test data. And guarantee is provided for the scientificity and the rigor of geological exploration. The testing device can be directly used for testing the density of frozen soil and lithologic soil.

Drawings

FIG. 1 is a schematic structural diagram of a soil density testing device in a severe cold region.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the height of a liquid discharge cylinder 1 is designed to be 50cm, a liquid discharge port of a drain pipe 3 is 40cm away from the ground, the volume of the lower part of a water discharge port of the liquid discharge cylinder is increased, the repeated test problem of the density of frozen soil is effectively solved in the actual engineering test, the using amount of clean water in the test is saved, and the problem that the clean water is difficult to prepare in the field test is effectively solved.

the iron plate 2 with the thickness of 3mm is welded at the bottom of the liquid discharge cylinder 1, the contact area of the liquid discharge cylinder and the ground is increased, the stability of the soil density testing device is firm, and the phenomenon that wind power influences the accuracy of test data and the collapse of test equipment is avoided due to the fact that the bottom area is large and the iron plate is heavy in the on-site strong wind environment.

The contact opening of the drain pipe 3 and the drainage tube 1 is a circle with a diameter of 5cm, and the outer opening of the drain pipe 3 is a circle with a diameter of 2 cm. The increase of the inner buckle of the water drain pipe 3 can effectively remove suspended matters and rotten matters in the liquid discharge cylinder, ensure the stability of the liquid level of the liquid, ensure the accuracy of liquid removal and effectively ensure the accuracy of field test data.

A method for testing soil density in severe cold regions comprises the following steps:

Step 1, taking about 1000-1500g of rock sample and weighing.

And 2, slowly pouring clear water at the temperature of approximately 0 ℃ into the drainage cylinder to enable the water surface to exceed the top of the drainage pipe, slowly descending the water surface in the drainage cylinder, and weighing the quality of the drainage cylinder and the water when the water surface is stable and the drainage pipe does not discharge water any more.

And 3, gently placing the core sample into the drainage cylinder, enabling water in the drainage cylinder to flow into the measuring cylinder, immediately weighing the quality of the drainage cylinder, the water and the sample after the water flow stops, and simultaneously measuring and reading the volume of the water in the measuring cylinder to check the volume of the core sample.

And 4, when the rock core sample is fully dissolved into a loose state in the liquid discharge cylinder, clarifying, adding clear water to enable the water surface to exceed the water drain pipe, and weighing the mass of the liquid discharge cylinder, water and soil particles after water flow stops.

And 5, keeping the water surface stable in the test process, wherein the liquid discharging cylinder cannot shake during water discharging and rock core sample placing.

And the soil density calculation method is operated according to the relevant standard requirements.

The height of the testing device is 20cm higher than that of the traditional device, the verticality of a matching instrument, namely a measuring cylinder when receiving clean water discharged by a drain pipe is ensured in the test, and the diameter of the circular iron plate 2 is 30cm, so that the stability of a liquid discharge cylinder test room is ensured.

When the traditional testing device is 30cm high in field test, a matched instrument, namely a measuring cylinder, needs to be placed in a side-inclined mode to receive clear water discharged from a water drain pipe, and the measuring cylinder is not favorable for stability of the measuring cylinder due to the side-inclined placement of the measuring cylinder and has the risk of leakage. The testing device can enable the matching instrument, namely the measuring cylinder, to stand to receive clear water discharged by the water drain pipe, and the measuring accuracy of the measuring cylinder is ensured. The aperture of the drain pipe 3 is increased to ensure the fluidity of the clear water discharged water.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.