CN216695991U - Contain native gas content normal position testing arrangement of gas and sounding device - Google Patents
Contain native gas content normal position testing arrangement of gas and sounding device Download PDFInfo
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- CN216695991U CN216695991U CN202122721666.4U CN202122721666U CN216695991U CN 216695991 U CN216695991 U CN 216695991U CN 202122721666 U CN202122721666 U CN 202122721666U CN 216695991 U CN216695991 U CN 216695991U
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Abstract
The invention relates to the technical field of in-situ soil body property testing, in particular to an in-situ testing device for gas content of gas-containing soil and a penetration testing device; the testing device comprises a machine body, wherein a heating system, a soil pressure testing system and a water pressure testing system are arranged on the machine body; the soil pressure testing system comprises a pressure cavity and a soil pressure sensor, wherein the pressure cavity is provided with an elastic side wall, and the soil pressure sensor is arranged in the pressure cavity; the water pressure testing system comprises a sealing cavity and a water pressure sensor, a water permeable hole is formed in the sealing cavity, and the water pressure sensor is arranged in the sealing cavity; the method comprises the steps of heating the surrounding soil body by controlling a heating system, testing the pressure, the soil pressure and the temperature of a water permeable hole (water) in the heating process, stopping heating after the final heating temperature is reached, and dissipating the pressure, the soil pressure and the temperature in the process; and calculating the gas content in the gas-containing soil through a quantitative relation of gas content-temperature-pressure.
Description
Technical Field
The invention relates to the technical field of in-situ soil body property testing, in particular to an in-situ testing device for gas content of gas-containing soil and a penetration testing device.
Background
The thermoosmosis effect is a phenomenon that the pressure of pore fluid is obviously increased along with the increase of the temperature of a certain point or a certain area in a stratum, the main reason is that the pressure of the pore fluid is generated and increased due to the difference of heated volume expansion of soil particles and the pore fluid, but the pressure value of the pore fluid is increased and then decreased regularly along with the exertion of the thermal consolidation effect of the soil body, and finally tends to 0.
The principle of the in-situ testing device for testing the gas content in the gas-containing soil by utilizing the heat seepage effect is as follows: the device is used for heating the soil around the device by the heating ring to cause the expansion of fluid in the soil, and as the fluid part in the gas-containing soil comprises water and gas, and the reaction of the gas to the temperature is far higher than that of the water and the soil, the quantitative relation between the gas content of the soil and the fluid pressure is deduced by utilizing indoor tests and theories to obtain the gas content of the soil in situ.
At present, the research of the heat seepage effect mainly focuses on the field of development and utilization of geothermal resources, such as energy piles, which mainly perform heat source heat consolidation problem research on saturated soil or unsaturated soil, and also form articles such as an approximate solution of a saturated soil cylindrical heat source heat consolidation problem, a limited heat source consolidation approximate solution considering the heat seepage effect, elasto-plastic simulation of unsaturated soil deformation characteristics under the action of heat-water-force coupling, and the like; and patent methods such as "soft clay thermal consolidation experimental model device disclosed in CN 201810935522.9", "thermal consolidation tester for internal heating of saturated soil and test method thereof disclosed in CN 201710110118.3", but the above devices mainly aim at establishing the relationship between temperature and consolidation effect, and although the patent also utilizes the phenomenon of thermo-osmosis effect, the device herein mainly aims at obtaining the gas content of gas-containing soil.
The testing of the gas content of the soil body containing gas soil in situ is very critical, and the existing testing of the gas content in the gas soil mainly comprises an in-situ testing device of a seabed shallow gas detection method based on MIP-CPT technology and a shallow gas content penetration testing device, and the methods have the defects of high price, large disturbance and the like.
The existing in-situ testing method for the gas content of the gas-containing soil has the defects of high price, large disturbance and the like, for example:
(1) for example, in a method for detecting shallow gas in the sea bottom based on the MIP-CPT technology disclosed in CN201510677546.5, the price of the MIP film is very high, and meanwhile, the method requires a mother ship, so that the method is difficult to popularize and apply, secondly, the method is very suitable for detecting gas components, but the gas content in the soil mass cannot be accurately estimated, however, in the study of the mechanical property formula of the soil mass, the gas content in the unit soil mass is the most important parameter;
(2) for example, the device and the method disclosed in CN201610455222.1 for in-situ measurement of gas content in seabed gas-containing soil require a cavity to be reserved on the probe rod, soil mass to be squeezed into the cavity, and the closed cavity to test the compression wave velocity and the highest compressible volume to estimate the gas content in the unit soil mass, and there are the following problems: 1. the reserved cavity can affect the strength of the penetration rod; 2. the soil mass extruded into the cavity in situ is disturbed soil mass; 3. the method needs to test that the air cavity is completely closed; 4. soil needs to be pumped and squeezed out during in-situ test, and the continuity is poor;
(3) the existing method for testing the modulus and the gas content of gas-containing soil by indoor test is mainly a bending element method, namely, the relationship between the wave velocity of compression waves and the gas content of soil is established.
In conclusion, a new method and a new device for detecting the gas content of the gas-containing soil are urgently expected in application, the detection cost is economic, the wide popularization and application are facilitated, and the requirement of large-scale gas-containing soil gas content testing is met without depending on complex instruments and equipment. The problem of above solution need be with the high components and parts set of more common sensitivity in a unit, and this unit can carry on the static sounding probe rod commonly used at present simultaneously, realizes the non-disturbance penetration test to the collection equipment that the sensor that adopts needs is simple.
Although the heat seepage effect is discovered early, the application range is limited at present, the heat seepage effect is expanded and used for quantitative evaluation of the gas content of the gas-containing soil, the reaction of the gas volume and the pressure to the temperature is far higher than that of water and soil, the large-amplitude increase of the total pressure and the pore water pressure can be caused, the method is an effective method for detecting and judging the gas-containing soil, and meanwhile, if a quantitative relation of the gas content-the temperature-the pressure is established, the method can be used for calculating the gas content of the gas-containing soil.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the in-situ testing device for the gas content of the gas-containing soil and the sounding device are simple in structure, do not depend on a mother ship with high price, are economical in detection cost and convenient to popularize and apply widely.
In order to solve the technical problems, the invention adopts the technical scheme that:
an in-situ testing device for gas content of gas-containing soil comprises a machine body, wherein a heating system, a soil pressure testing system and a water pressure testing system are arranged on the machine body;
the soil pressure testing system comprises a pressure cavity and a soil pressure sensor, wherein the pressure cavity is provided with an elastic side wall, and the soil pressure sensor is arranged in the pressure cavity;
the water pressure testing system comprises a sealed cavity and a water pressure sensor, a water permeable hole is formed in the sealed cavity, and the water pressure sensor is arranged in the sealed cavity.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a sounding device comprises a penetration rod and a plurality of in-situ testing devices for the gas content of the gas-containing soil.
The invention has the beneficial effects that: the device is connected to the injection rod through a bolt structure and a thread structure (the device is of a standard size), the soil pressure testing system is adjusted after the device is in place, the pressure testing surface is tightly attached to the soil body, the strain gauge resets, and preparation work before testing is completed. The method comprises the steps of heating the surrounding soil body by controlling a heating system, heating the surrounding soil body step by step at a temperature higher than that of the surrounding soil body, ensuring that the final temperature is lower than 80 ℃, testing the pressure, soil pressure and temperature of water-permeable holes (water) in the heating process, stopping heating after the final heating temperature is reached, and dissipating the pressure, soil pressure and temperature in the process. The large increase of pore pressure and soil pressure indicates that the soil contains gas, and the gas content in the gas-containing soil is calculated through the quantitative relation of gas content-temperature-pressure.
Drawings
FIG. 1 is a schematic diagram of an in-situ testing apparatus for gas content in soil according to an embodiment of the present invention;
description of reference numerals: 1. a body; 2. a heating ring; 3. a pressure chamber; 4. a soil pressure sensor; 5. a resilient sidewall; 6. sealing the cavity; 7. a water pressure sensor; 8. water permeable holes; 9. a first temperature sensor; 10. a first temperature correction sensor; 11. a second temperature correction sensor; 12. a piston; 13. a connecting rod; 14. a stepping motor; 15. a strain sensor; 16. a metal sheet; 17. a permeable stone; 18. an acquisition instrument; 19. a first signal amplifier; 20. a second signal amplifier; 21. a second temperature sensor; 22. a hydrostatic pressure inlet hole; 23. a bolt structure; 24. and (4) a thread structure.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, an in-situ testing device for gas content in gas-containing soil comprises a machine body 1, wherein a heating system, a soil pressure testing system and a water pressure testing system are arranged on the machine body 1;
the soil pressure testing system comprises a pressure cavity 3 and a soil pressure sensor 4, wherein the pressure cavity 3 is provided with an elastic side wall 5, and the soil pressure sensor 4 is arranged in the pressure cavity 3;
the water pressure testing system comprises a sealed cavity 6 and a water pressure sensor 7, a water permeable hole 8 is formed in the sealed cavity 6, and the water pressure sensor 7 is arranged in the sealed cavity 6.
From the above description, the heating system is controlled to heat the surrounding soil body, the temperature is higher than that of the surrounding soil body, the heating is performed step by step, the final temperature is guaranteed to be lower than 80 ℃, the pressure, soil pressure and temperature of the water permeable holes 8 (water) in the heating process are tested, after the final heating temperature is reached, the heating is stopped, and the hole pressure, soil pressure and temperature in the dissipation process are performed. The large increase of pore pressure and soil pressure indicates that the soil contains gas, and the gas content in the gas-containing soil is calculated through the quantitative relation of gas content-temperature-pressure.
Further, the pressure chamber 3 is further provided with a first temperature sensor 9 and a first temperature correction sensor 10, and the sealed chamber 6 is further provided with a second temperature correction sensor 11.
As is apparent from the above description, the soil pressure sensor 4 can be corrected by the first temperature sensor 9 and the first temperature correction sensor 10; the water pressure sensor 7 can be corrected by the second temperature correction sensor 11.
Further, the soil pressure testing system also comprises a piston 12, a connecting rod 13 and a stepping motor 14, wherein hydraulic oil is filled in the pressure cavity 3; the pressure chamber 3 has a sealing portion for moving the piston 12, and the stepping motor 14 is connected to the piston 12 through a connecting rod 13 and drives the piston 12 to reciprocate along the sealing portion.
Further, elasticity lateral wall 5 is the rubber membrane, the holding tank has been seted up on the outside one side of rubber membrane, strain sensor 15 has in the holding tank, strain sensor 15 coats and is stamped sheetmetal 16.
From the above description, the soil pressure testing system plays a role in protecting the soil pressure sensor 4, before the gas-containing soil gas content in-situ testing device is inserted into the soil in-situ testing device, the stepping motor 14 controls the connecting rod 13 and the piston 12 to move downwards, the rubber membrane and the metal sheet 16 are slightly concave inwards, the strain sensor 15 can test a tensile signal, after the insertion is in place, the stepping motor 14 is controlled to push the connecting rod 13 and the piston 12, the strain sensor 15 is reset through the pressure cavity 3, the testing soil body and the metal sheet 16 are in close contact, the stepping motor 14 is locked, the soil body pressure is increased after heating, the testing soil body pressure acts on the rubber membrane and the metal sheet 16, and the hydraulic oil cavity is further compressed, the pressure tested by the differential pressure type pressure sensor is the soil body pressure, and the first temperature correction sensor 10 is used for assisting in temperature correction of the soil pressure sensor 4.
Further, a permeable stone 17 is arranged in the position of the sealing cavity 6 close to the permeable hole 8.
Further, a hydrostatic pressure inlet hole 22 is formed in the machine body 1, and the hydrostatic pressure inlet hole 22 is sealed and communicated with the pressure cavity 3 and the sealing cavity 6.
From the above description, it can be seen that by the arrangement of the hydrostatic pressure inlet hole 22, the clean water pressure can be introduced, mainly to adapt to the high water pressure formation conditions, such as deep sea environment, the differential pressure sensor only measures the changes of the hole pressure and the soil pressure, so that in the case of high background value, the test precision can be greatly improved.
Further, the heating system comprises a plurality of heating rings 2, and the plurality of heating rings 2 are distributed on the outer surface of the machine body 1.
Further, the in-situ testing device for gas content in gas-containing soil further comprises an acquisition control system, the acquisition control system comprises an acquisition instrument 18, a first signal amplifier 19, a second signal amplifier 20 and a second temperature sensor 21, the acquisition instrument 18 is electrically connected with the soil pressure sensor 4 through the first signal amplifier 19, the acquisition instrument 18 is electrically connected with the water pressure sensor 7 through the second signal amplifier 20, the second temperature sensor 21 is arranged on the side wall of the machine body 1 and located among the plurality of heating rings 2, and the second temperature sensor is electrically connected with the acquisition instrument 18;
the acquisition control system acquires data from the heating system, the soil pressure test system and the water pressure test system and controls the heating system, the soil pressure test system and the water pressure test system to work.
As can be seen from the above description, the micro-current can be converted into the normal collection voltage by the first signal amplifier 19 and the second signal amplifier 20; the electric connection that this application is related to adopts waterproof cable to realize.
A penetration device comprises a penetration rod and a plurality of in-situ test devices for the gas content of the gas-containing soil.
Further, the machine body 1 is a cylinder, the top of the machine body 1 is provided with a protruding bolt structure 23, and the bottom of the machine body is provided with a recessed thread structure 24 corresponding to the bolt structure 23; the penetrating rod is provided with the same bolt structure 23 and a thread structure 24;
the device for testing the gas content in situ of the gas-containing soil is provided with a plurality of devices, and the device for testing the gas content in situ of the gas-containing soil and the injection rod are mutually matched and fixed through a bolt structure 23 and a thread structure 24.
The bolt passing structure 23 and the thread structure 24 are connected to the injection rod (the device is in a standard size), the soil pressure testing system is adjusted after the bolt passing structure is in place, the pressure testing surface is tightly attached to the soil body, the strain gauge resets, and preparation work before testing is completed.
Example one
An in-situ testing device for gas content of gas-containing soil comprises a machine body, wherein a heating system, a soil pressure testing system and a water pressure testing system are arranged on the machine body; the heating system, the soil pressure testing system and the water pressure testing system are arranged in the machine body; the machine body is a sealing structure;
the soil pressure testing system comprises a pressure cavity and a soil pressure sensor, wherein the pressure cavity is provided with an elastic side wall, and the soil pressure sensor is arranged in the pressure cavity; an opening for contacting the elastic side wall with the outside is formed in the side wall of the machine body.
The water pressure testing system comprises a sealed cavity and a water pressure sensor, a water permeable hole is formed in the sealed cavity, and the water pressure sensor is arranged in the sealed cavity. A channel for connecting the water permeable hole with the outside is formed on the side wall of the machine body;
the pressure cavity is further provided with a first temperature sensor and a first temperature correction sensor, and a second temperature correction sensor is further arranged in the sealing cavity.
The soil pressure testing system also comprises a piston, a connecting rod and a stepping motor, and hydraulic oil is filled in the pressure cavity; the pressure cavity is provided with a sealing part for the piston to move, and the stepping motor is connected with the piston through a connecting rod and drives the piston to reciprocate along the sealing part.
The elastic side wall is a rubber film, a containing groove is formed in one side, which faces outwards, of the rubber film, a strain sensor is arranged in the containing groove, and a metal sheet covers the strain sensor.
And a permeable stone is arranged in the position, close to the permeable hole, of the sealing cavity.
A hydrostatic pressure inlet hole is formed in the machine body and communicated with the pressure cavity and the sealing cavity in a sealed mode.
The heating system comprises two heating rings, and a groove body for accommodating the heating rings is arranged on the periphery of the machine body; two heating rings are distributed in the groove body. The elastic side wall and the water permeable hole are positioned between the two heating rings.
The in-situ testing device for the gas content of the gas-containing soil further comprises an acquisition control system, wherein the acquisition control system comprises an acquisition instrument, a first signal amplifier, a second signal amplifier and a second temperature sensor, the acquisition instrument is electrically connected with the soil pressure sensor through the first signal amplifier, the acquisition instrument is electrically connected with the water pressure sensor through the second signal amplifier, the second temperature sensor is arranged on the side wall of the machine body and positioned among the heating rings, and the second temperature sensor is electrically connected with the acquisition instrument;
the acquisition control system acquires data from the heating system, the soil pressure testing system and the water pressure testing system and controls the heating system, the soil pressure testing system and the water pressure testing system to work.
The micro-current can be converted into normal acquisition voltage through the first signal amplifier and the second signal amplifier; the electric connection that this application is related to adopts waterproof cable to realize.
Example two
A penetration device comprises a penetration rod and the in-situ testing device for the gas content of the gas-containing soil in the embodiment I.
The machine body is a cylinder, the top of the machine body is provided with a protruding bolt structure, and the bottom of the machine body is provided with a sunken thread structure corresponding to the bolt structure; the penetration rod is provided with the same bolt structure and thread structure;
the device for testing the gas content in situ of the gas-containing soil is provided with a plurality of devices, and the device for testing the gas content in situ of the gas-containing soil and the injection rod are fixed by mutually matching a bolt structure and a thread structure.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (10)
1. The in-situ testing device for the gas content of the gas-containing soil is characterized by comprising a machine body, wherein a heating system, a soil pressure testing system and a water pressure testing system are arranged on the machine body;
the soil pressure testing system comprises a pressure cavity and a soil pressure sensor, wherein the pressure cavity is provided with an elastic side wall, and the soil pressure sensor is arranged in the pressure cavity;
the water pressure testing system comprises a sealed cavity and a water pressure sensor, a water permeable hole is formed in the sealed cavity, and the water pressure sensor is arranged in the sealed cavity.
2. The in-situ testing device for gas content in gas-containing soil according to claim 1, wherein the pressure chamber is further provided with a first temperature sensor and a first temperature correction sensor, and the sealing chamber is further provided with a second temperature correction sensor.
3. The in-situ testing device for gas content in gas-containing soil according to claim 1, wherein the soil pressure testing system further comprises a piston, a connecting rod and a stepping motor, and hydraulic oil is filled in the pressure cavity; the pressure cavity is provided with a sealing part for the piston to move, and the stepping motor is connected with the piston through a connecting rod and drives the piston to reciprocate along the sealing part.
4. The in-situ testing device for gas content in soil according to claim 1, wherein the elastic sidewall is a rubber membrane, an accommodating groove is formed on an outward side of the rubber membrane, a strain sensor is arranged in the accommodating groove, and a metal sheet is covered on the strain sensor.
5. The in-situ testing device for gas content in gas-containing soil according to claim 1, wherein a permeable stone is arranged in the sealing cavity near the water permeable hole.
6. The in-situ testing device for gas content in gas-containing soil according to claim 1, wherein a hydrostatic pressure inlet hole is formed in the machine body, and the hydrostatic pressure inlet hole is communicated with the pressure cavity and the sealing cavity in a sealed mode.
7. The in-situ testing device for gas content in gas-containing soil according to claim 1, wherein the heating system comprises a plurality of heating rings, and the plurality of heating rings are distributed on the outer surface of the machine body.
8. The in-situ testing device for gas content in gas-containing soil according to claim 7, further comprising a collection control system, wherein the collection control system comprises a collection instrument, a first signal amplifier, a second signal amplifier and a second temperature sensor, the collection instrument is electrically connected with the soil pressure sensor through the first signal amplifier, the collection instrument is electrically connected with the water pressure sensor through the second signal amplifier, the second temperature sensor is arranged on the side wall of the machine body and located among the plurality of heating rings, and the second temperature sensor is electrically connected with the collection instrument;
the acquisition control system acquires data from the heating system, the soil pressure test system and the water pressure test system and controls the heating system, the soil pressure test system and the water pressure test system to work.
9. A penetration device comprising a penetration rod and a plurality of in-situ gas content testing devices according to any one of claims 1 to 8.
10. The sounding device according to claim 9, wherein the body is a cylinder, the top of the body is a protruding bolt structure, and the bottom of the body is a recessed thread structure corresponding to the bolt structure; the penetration rod is provided with the same bolt structure and the same thread structure;
the device for testing the gas content in situ of the gas-containing soil is provided with a plurality of devices, and the device for testing the gas content in situ of the gas-containing soil and the injection rod are fixed by mutually matching a bolt structure and a thread structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122721666.4U CN216695991U (en) | 2021-11-08 | 2021-11-08 | Contain native gas content normal position testing arrangement of gas and sounding device |
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| CN202122721666.4U CN216695991U (en) | 2021-11-08 | 2021-11-08 | Contain native gas content normal position testing arrangement of gas and sounding device |
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| CN216695991U true CN216695991U (en) | 2022-06-07 |
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