CN111189992A - Engineering soil body frost heaving force testing device - Google Patents

Engineering soil body frost heaving force testing device Download PDF

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CN111189992A
CN111189992A CN201811350754.4A CN201811350754A CN111189992A CN 111189992 A CN111189992 A CN 111189992A CN 201811350754 A CN201811350754 A CN 201811350754A CN 111189992 A CN111189992 A CN 111189992A
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copper box
box body
copper
frost heaving
testing device
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王怀义
何建村
贺传卿
蔡正银
黄英豪
杨桂权
李鑫
聂新山
金龙
王显旭
孙金龙
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XINJIANG WATER CONSERVANCY & HYDROPOWER MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTER
Xinjiang Institute of Water Resources and Hydropower Research
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XINJIANG WATER CONSERVANCY & HYDROPOWER MATERIAL ENGINEERING TECHNOLOGY RESEARCH CENTER
Xinjiang Institute of Water Resources and Hydropower Research
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Priority to CN201811350754.4A priority Critical patent/CN111189992A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

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Abstract

The invention belongs to a frost heaving amount testing device of an engineering soil body, in particular to a frost heaving force testing device of an engineering soil body, a cubic copper box body is formed by pure copper plates, the upper opening of the copper box body is hinged with a copper box cover formed by a pure copper plate through a hinge seat, the four walls, the bottom surface and the copper box cover of the copper box body are respectively and uniformly provided with strip-shaped permeable holes on the inner walls of six surfaces of the closed copper box body, the resistance strain gauges which are criss-cross and are positioned at the center of the inner wall are respectively arranged along the central line of each inner wall, wherein the axes of the resistance strain gauges respectively arranged on the corresponding inner walls of the closed copper box body are mutually vertical, and soil materials which are the same as the engineering soil body are filled in the copper box body, the soil materials are filled in two layers and tamped in layers, an electric logging thermometer is embedded in the copper box body, and a cable of the resistance strain gauge is led out from the water permeable hole and is connected with a reading instrument. The device has the advantages of reasonable structure, reliable performance, capability of measuring the frost heaving force of the engineering soil body in the three-dimensional direction, high measurement precision, good durability, no influence of low temperature and corrosion of water and soil environments, and convenient installation and use.

Description

Engineering soil body frost heaving force testing device
Technical Field
The invention belongs to a frost heaving amount testing device for an engineering soil body, and particularly relates to a frost heaving force testing device for an engineering soil body.
Background
At present, in foundation projects such as earth dams, dykes and the like in cold or severe cold areas, when the water content of the dams, dykes and the like is high, and when the foundation projects are in low-temperature seasons, soil bodies can be frozen and swelled, so that the foundation and the superstructure of the soil bodies are damaged, the normal use of the project is influenced, and the project has to spend time and money for maintenance work such as foundation drainage, replacement filling, superstructure repair and the like. Therefore, the frost heaving force of the engineering soil body is accurately measured, and the method plays an important role in solving the frost heaving problem of the engineering foundation.
Disclosure of Invention
The invention aims to provide a frost heaving force testing device for an engineering soil body, which has the advantages of reasonable structure, reliable performance, high measurement precision, good durability, no influence of low temperature and corrosion of water and soil environments, convenience in installation and use, and capability of measuring the frost heaving force of the engineering soil body in the three-dimensional direction.
The purpose of the invention is realized as follows: the engineering soil frost heaving force testing device comprises a copper box body which is formed by a cube of a pure copper plate, a copper box cover which is formed by the pure copper plate is hinged on the upper opening of the copper box body through a hinge seat, strip-shaped water permeable holes are uniformly distributed on the four walls, the bottom surface and the copper box cover of the copper box body respectively and are arranged on the inner walls of six surfaces of the closed copper box body, a resistance strain gauge which is criss-cross and is positioned at the center of the inner wall is arranged along the central line of each inner wall, the axes of the resistance strain gauges which are respectively arranged on the corresponding inner walls of the closed copper box body are mutually vertical, soil materials which are the same as the engineering soil body are filled in the copper box body, the resistance strain gauges are filled in two layers and tamped in layers, an electric measuring thermometer is embedded in the copper box body, and a cable of the resistance strain gauge is led out from the water permeable holes and is connected with.
The working principle of the invention is as follows:
1. in the process of filling foundation soil bodies such as earth and rock dams, canal dike soil bodies and the like, excavating a square pit not smaller than 50cm multiplied by 50cm on the filled and rolled soil bodies, and putting the device into the pit;
2. opening a rolled pure copper cover plate of the device, filling soil materials which are the same as soil filling into a rolled pure copper box body of the device, filling the rolled pure copper box body in two layers, and filling the soil materials with fine grains (the grain diameter is less than 0.5 mm) within 5cm of the periphery of the strain gauge in an intention of filling, so that the strain gauge is prevented from being damaged during tamping;
3. when two layers of the rolled pure copper box are tamped, after an electric thermometer is embedded in the rolled pure copper box, the rubber box is filled with a small amount of soil, the cable of the strain gauge is led out from the water permeable groove, and the cable is protected;
4. after the working steps are finished, the rolled pure copper cover plate is covered on the upper part of the rolled pure copper box body, the cover plate connecting pipes are embedded in a crossed mode, the cover plate fixing copper inserting rods are inserted into the centers of the cover plate connecting pipes at two ends respectively, the rolled pure copper cover plate is fixed, and at the moment, the engineering soil body frost heaving force testing device is installed completely.
5. After the engineering soil body frost heaving force testing device is installed, the upper part still carries out rolling compaction on filling of soil materials according to engineering requirements until the engineering filling is finished.
6. After the engineering soil is filled and rolled, the strain gauge cable led out from the device is respectively connected with a reading instrument to measure and read the strain of each strain gauge, the strain reading of each strain gauge at each position is the initial reading of the device, and the measured value is respectively epsilonS0、εN0、εU0、εD0、εE0And εW0(unit: mu. epsilon. or. times.10)-6Six strain gauges are arranged on six surfaces in total), one strain gauge is arranged on each of the six surfaces and three perpendicular surfaces, and the measured values are respectively epsilonS0、εU 0And epsilonE 0(unit: mu. epsilon. or. times.10)-6Strain);
7. then in low-temperature season, respectively measuring the soil body temperature at the moment and the readings of all the strain gauges, and when n is reached, respectively measuring the measured values as epsilonSn、εNn、εUn、εDn、εEnAnd εWn(unit: mu. epsilon. or. times.10)-6Strain, six strain gauges are arranged on six surfaces in total); the frost heaving force of the engineering soil body in three directions can be calculated according to a formula when n is measured, and the frost heaving forces are respectively counted as PS、PUAnd PE(unit: MPa). Wherein 110 is the modulus of elasticity E (unit GPa) of a rolled pure copper plate
The north-south direction:
Figure DEST_PATH_IMAGE002
the east-west direction:
Figure DEST_PATH_IMAGE004
the up-down direction:
Figure DEST_PATH_IMAGE006
three vertical surfaces of the six surfaces are respectively provided with oneStrain gauges, the value of n is measured as ∈Sn、εUnAnd εEn(unit: mu. epsilon. or. times.10)-6Strain); the frost heaving force of the engineering soil body in three directions can be calculated according to a formula when n is measured, and the frost heaving forces are respectively counted as PS、PUAnd PE(unit: MPa).
The north-south direction:
Figure DEST_PATH_IMAGE008
the east-west direction:
Figure DEST_PATH_IMAGE010
the up-down direction:
Figure DEST_PATH_IMAGE012
。
the invention has the following positive effects:
the engineering soil body frost heaving force testing device provided by the invention is mainly characterized by three aspects: the matrix material of the invention is a rolled pure copper plate, which not only has good durability and is not affected by low temperature and corrosion of water and soil environment, but also has large deformation and tensile strength of an elastomer and can bear frost heaving deformation and frost heaving force of soil; secondly, the water permeable grooves are respectively designed on the six surfaces, so that the smoothness of the infiltration and the seepage of environmental water is realized, the water-containing states of the soil body in the rolled pure copper box body and the peripheral soil body are kept consistent, and the conformity of the test result and the frost heaving condition of the engineering soil body is ensured; thirdly, the frost heaving measuring device adopts a BX120-100AA resistance strain gauge, the BHF series strain gauge has the functions of high precision, full sealing, temperature self-compensation and creep self-compensation, and finally the strain gauge is protected by a hard plastic protective sleeve, so that the influence of the pressure of a soil body on the strain gauge is avoided.
The invention has reasonable structure and reliable performance, realizes the measurement of the frost heaving force of the engineering soil body in the three-dimensional direction, has high measurement precision and good durability, is not influenced by low temperature and the corrosion of water and soil environments, and is convenient to install and use.
Drawings
The present invention will be further described with reference to the accompanying drawings, in which fig. 1 is a schematic front view, fig. 2 is a schematic side view, fig. 3 is a schematic top view, fig. 4 is a schematic sectional view of a-a in fig. 1, and fig. 5 is a schematic sectional view of a-B in fig. 3.
Detailed Description
A frost heaving force testing device for engineering soil bodies is shown in figures 1, 2, 3, 4 and 5, a cubic copper box body 1 is formed by pure copper plates, the upper opening of the copper box body 1 is hinged with a copper box cover 5 formed by a pure copper plate through a hinge seat, the four walls, the bottom surface and the copper box cover 5 of the copper box body 1 are respectively and evenly provided with strip-shaped permeable holes 2 on the inner walls of six surfaces of the closed copper box body, the resistance strain gauges 6 which are criss-cross and are positioned at the center of the inner wall are respectively arranged along the central line of each inner wall, wherein the axes of the resistance strain gauges 6 respectively arranged on the corresponding inner walls of the closed copper box body are mutually vertical, filling soil materials which are the same as the engineering soil body in the copper box body 1, filling in two layers, tamping in layers, an electric measuring thermometer is embedded in the copper box body 1, and a cable of the resistance strain gauge 6 is led out from the water permeable hole 2 and is connected with a reading instrument. The resistance strain gauge 6 is a BX120-100AA resistance strain gauge. When the copper box body 1 is filled with soil materials, fine-particle soil bodies with the particle size of less than 0.5mm are filled in the range of 5cm around the resistance strain gauge 6. The thickness of the pure copper plate forming the copper box body 1 is 5 mm. A hard plastic protective sleeve 8 is arranged outside the resistance strain gauge 6. The compaction degree of the rammed soil layer in the copper box body 1 is the same as the compaction degree of the engineering soil body filling. The length, width and height of the copper box body 1 are respectively 500 mm. The structure of articulated seat is setting up the box connecting pipe 3 that is interrupted for the equipartition respectively on two opposite sides of the mouth on copper box 1, is setting up respectively on two opposite sides of copper apron 5 and is being interrupted the department matched with apron connecting pipe 4 with the box connecting pipe 3 of equipartition, connects copper apron 5 on the mouth on copper box 1 through inserted plunger 7.

Claims (8)

1. The utility model provides an engineering soil body frozen swelling power testing arrangement which characterized by: a cubic copper box body (1) formed by pure copper plates, a copper box cover (5) formed by pure copper plates is hinged at the upper opening of the copper box body (1) through a hinge seat, the four walls and the bottom surface of the copper box body (1) and the copper box cover (5) are respectively and uniformly provided with strip-shaped permeable holes (2) on the inner walls of six surfaces of the closed copper box body, the central lines of the inner walls of each surface are respectively provided with a criss-cross resistance strain gage (6) positioned in the center of the inner wall, wherein the axes of the resistance strain gauges (6) respectively arranged on the corresponding inner walls of the closed copper box body are mutually vertical, filling soil materials which are the same as the engineering soil body in the copper box body (1), filling in two layers, tamping in layers, an electric measuring thermometer is embedded in the copper box body (1), and a cable of the resistance strain gauge (6) is led out from the water permeable hole (2) to be connected with a reading instrument.
2. The engineering soil body frost heaving force testing device of claim 1, wherein: the resistance strain gauge (6) is a BX120-100AA resistance strain gauge.
3. The engineering soil body frost heaving force testing device of claim 1, wherein: when the copper box body (1) is filled with soil materials, fine-particle soil bodies with the particle size of less than 0.5mm are filled in the range of 5cm around the resistance strain gauge (6).
4. The engineering soil body frost heaving force testing device of claim 1, wherein: the thickness of the pure copper plate forming the copper box body (1) is 5 mm.
5. The engineering soil body frost heaving force testing device of claim 1, wherein: a hard plastic protective sleeve (8) is arranged outside the resistance strain gauge (6).
6. The engineering soil body frost heaving force testing device of claim 1, wherein: the compaction degree of the rammed soil layer in the copper box body (1) is the same as the compaction degree of the engineering soil body filling.
7. The engineering soil body frost heaving force testing device of claim 1, wherein: the length, the width and the height of the copper box body (1) are respectively 500 mm.
8. The engineering soil body frost heaving force testing device of claim 1, wherein: the structure of articulated seat is setting up interrupted box connecting pipe (3) for the equipartition respectively on two opposite sides of copper box (1) suitable for reading, is setting up respectively on two opposite sides of copper apron (5) and is being interrupted department matched with apron connecting pipe (4) with box connecting pipe (3) of equipartition, connects copper apron (5) on the suitable for reading of copper box (1) through inserted plunger (7).
CN201811350754.4A 2018-11-14 2018-11-14 Engineering soil body frost heaving force testing device Pending CN111189992A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113176170A (en) * 2021-05-24 2021-07-27 内蒙古工业大学 Pumice concrete frost heaving stress testing device and method, test piece and manufacturing method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113176170A (en) * 2021-05-24 2021-07-27 内蒙古工业大学 Pumice concrete frost heaving stress testing device and method, test piece and manufacturing method

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