CN112525711B - Bidirectional deep soil mechanical parameter in-situ testing device and testing structure - Google Patents
Bidirectional deep soil mechanical parameter in-situ testing device and testing structure Download PDFInfo
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- CN112525711B CN112525711B CN202011348945.4A CN202011348945A CN112525711B CN 112525711 B CN112525711 B CN 112525711B CN 202011348945 A CN202011348945 A CN 202011348945A CN 112525711 B CN112525711 B CN 112525711B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0208—Specific programs of loading, e.g. incremental loading or pre-loading
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention relates to the field of soil permeability coefficient detection devices, in particular to a bidirectional deep soil mechanical parameter in-situ test device and a test structure which are used for better establishing the correlation between an in-situ test result and an indoor test result so as to improve the accuracy of deep soil mechanical parameter selection. And supporting the soil body upwards and downwards respectively through the corresponding jacks, acquiring corresponding parameters through the parameter acquisition system, and obtaining corresponding bidirectional deep soil body mechanical parameters through analysis and processing of the parameters. Due to the innovation of the detection mode and the corresponding structure, the device can better establish the correlation between the in-situ test result and the indoor test result. The invention is especially suitable for the detection of deep soil mechanical parameters.
Description
Technical Field
The invention relates to the field of soil mechanical parameter detection devices, in particular to a bidirectional deep soil mechanical parameter in-situ test device and a test structure.
Background
Along with the acceleration of construction of large-scale national engineering, the depth of the soil layer is continuously increased, and the depth is far beyond the current specification. Because of complex geological conditions of the deep soil body, the prior theory and calculation method have limitation on calculation of key parameters such as the bearing capacity and sedimentation of the deep soil body, and have great influence on design and construction of engineering, investment cost and safe operation. The method for determining the soil layer mechanical parameters through the on-site in-situ test is a relatively visual method, but is limited by the current on-site test conditions and technical level, the in-situ test result of the deep soil body without loss of the overburden pressure and the pore water pressure is difficult to obtain, the correlation between the in-situ test result and the indoor test result cannot be well established, the accuracy of the deep soil body mechanical parameters is poor, and the method becomes a technical problem for restricting the breakthrough of the engineering construction level in China.
Disclosure of Invention
The invention aims to solve the technical problem of providing a bidirectional in-situ testing device and a testing structure for deep soil mechanical parameters, which are used for better establishing the correlation between in-situ test results and indoor test results so as to improve the accuracy of deep soil mechanical parameter selection.
The technical scheme adopted for solving the technical problems is as follows: the in-situ testing device for the mechanical parameters of the bidirectional deep soil body comprises a parameter acquisition system, a pair of jacks and a shell fixedly arranged between the pair of jacks, wherein the pushing-out directions of the jacks at two sides of the shell are arranged in a back-to-back mode, and the tops of the jacks are respectively and correspondingly provided with a pressure-bearing plate structure.
Further, the parameter acquisition system comprises a displacement sensor and an inclination sensor, wherein a moving part of the displacement sensor is arranged in a piston rod of the jack, and the inclination sensor is arranged in the shell.
Further, the parameter acquisition system comprises a soil pressure sensor and a pore water pressure gauge, wherein the soil pressure sensor and the pore water pressure gauge are arranged on the bottom surface of the pressure bearing plate structure, and the bottom surfaces of the soil pressure sensor and the pore water pressure gauge are flush with the bottom surface of the pressure bearing plate structure.
Further, the loading system comprises an oil inlet pipe, an oil return pipe and a stabilized pump station, wherein one ends of the oil inlet pipe and the oil return pipe are communicated with the stabilized pump station, and the other ends of the oil inlet pipe and the oil return pipe are communicated with the jack.
Further, the parameter acquisition system comprises a protection pipeline, and an oil inlet pipe, an oil return pipe and a sensor data line are arranged in the protection pipeline.
Further, the wireless sensor comprises a wireless acquisition module, and the wireless acquisition module is communicated with a sensor data line.
Further, the protection pipeline is arranged in the high-pressure braided winding rubber pipe.
Further, the periphery of testing arrangement is provided with the concrete protection piece, wherein, the top and the bottom of concrete protection piece are flush with the bearing plate structure at testing arrangement's top and the bearing plate structure at bottom respectively.
Further, the lower part of the concrete protection block and the testing device is provided with an undisturbed soil structure, and the upper part of the concrete protection block and the testing device is provided with a backfill soil cushion layer.
Further, a backfill or a weight layer is arranged above the backfill cushion layer.
The beneficial effects of the invention are as follows: when the testing device is in actual use, soil bodies are respectively supported up and down through the corresponding jacks, corresponding parameters are acquired through the parameter acquisition system, and corresponding bidirectional deep soil body mechanical parameters are obtained through analysis and processing of the parameters. Due to the innovation of the detection mode and the corresponding structure, the device can better establish the correlation between the in-situ test result and the indoor test result, thereby improving the accuracy of deep soil mechanical parameter selection. The invention is especially suitable for the detection of deep soil mechanical parameters.
Drawings
FIG. 1 is an overall layout of a test apparatus in which the present invention is actually used.
Fig. 2 is a cross-sectional view of the present invention.
FIG. 3 is a cross-sectional view of the present invention with the addition of a concrete protector.
FIG. 4 is a plan view of the test apparatus in actual use of the present invention.
Fig. 5 is a schematic diagram of a guard pipeline of the present invention.
Fig. 6 is a schematic view of the protective tubing of the present invention disposed on a high pressure braided wound hose.
FIG. 7 is a schematic diagram of a loading system of the present invention.
Fig. 8 is a schematic diagram of an acquisition system of the present invention.
Marked in the figure as: the testing device 1, a concrete protection block 2, a loading system 3, a parameter acquisition system 4, a protection pipeline 5, a jack 6, a bearing plate structure 7, a bearing plate protective cover 8, a shell 9, an end cover 10, a wire outlet device 11, a soil pressure sensor 12, a pore water pressure gauge 13, a displacement sensor 14, an inclination sensor 15, a wire leading pipe groove 16, an oil inlet pipe 17, an oil return pipe 18, a stabilized pump station 19, a sensor data line 20, a wireless acquisition module 21, a high-pressure woven winding rubber pipe 22, a weight layer 111, a backfill soil cushion layer 112, an undisturbed soil structure 113 and a fixed point 212.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The bidirectional deep soil mechanical parameter in-situ testing device shown in fig. 1 to 8 comprises a parameter acquisition system 4, a pair of jacks 6 and a shell 9 fixedly arranged between the jacks 6, wherein the pushing-out directions of the jacks 6 on two sides of the shell 9 are arranged in a back direction, and the tops of the jacks 6 are respectively and correspondingly provided with a bearing plate structure 7.
The device measures the mechanical parameters of the deep soil body when the overburden pressure and the pore water pressure are not lost, and establishes the correlation between the in-situ test and the indoor test. In practical design, as shown in fig. 2, since the jacks 6 are symmetrically arranged and the pushing directions of the jacks 6 on both sides are arranged back to back, it is preferable that the jacks 6 are large-diameter low-friction jacks. Because the pushing directions of the jacks 6 are opposite, the rear ends of the corresponding two jacks 6 are only required to be welded with the shell 9, and the periphery of the bearing plate structure 7 at the front ends of the jacks 6 is tightly pressed through the bearing plate protective cover 8. The bearing plate protective cover 8 is arranged on the cylinder body of the jack 6 through a screw, and a piston rod in the jack 6 is connected with the bearing plate 7 through the screw. In addition, it is preferable that a line outlet 11 is provided on the side surface of the test device 1, and the sensor data line and the hydraulic line of the parameter acquisition system 4 are collected in the end cap 10, and the isolation and collection of the inside and the outside of the casing 9 are realized by the line outlet 11. The joints of all the parts adopt corresponding sealing elements and external seals, so that the soil pressure and the water pressure which are higher than 1.0MPa can be born.
For the corresponding parameter detection, the parameter acquisition system is generally selected to comprise a displacement sensor 14 and an inclination sensor 15, wherein the moving part of the displacement sensor 14 is arranged in the piston rod of the jack 6, and the inclination sensor 15 is arranged in the housing (9). The acquired corresponding information is collected to a parameter acquisition system 4 for processing. Based on the same conception, it is preferable that the parameter acquisition system comprises a soil pressure sensor 12 and a pore water pressure gauge 13, wherein the soil pressure sensor 12 and the pore water pressure gauge 13 are arranged on the bottom surface of the bearing plate structure 7, and the bottom surfaces of the soil pressure sensor 12 and the pore water pressure gauge 13 are all level with the bottom surface of the bearing plate structure 7.
In order to realize loading of the jack 6 and thus complete corresponding detection actions, the loading system 3 preferably comprises a loading system 3, wherein the loading system 3 consists of an oil inlet pipe 17, an oil return pipe 18 and a stabilized pump station 19, one ends of the oil inlet pipe 17 and the oil return pipe 18 are communicated with the stabilized pump station 19, and the other ends of the oil inlet pipe 17 and the oil return pipe 18 are communicated with the jack 6.
As key components for parameter transmission and oil pressure signal acquisition, the parameter acquisition system 4 preferably comprises a protection pipeline 5, and an oil inlet pipe 17, an oil return pipe 18 and a sensor data line 20 are arranged in the protection pipeline 5. As shown in fig. 1 and 6, the protection pipeline 5 is connected with the loading system 3 and the parameter acquisition system 4, and completes the oil path transmission and the acquisition signal transmission respectively corresponding to the protection pipeline. The system 4 also comprises a wireless acquisition module 21, wherein the wireless acquisition module 21 is communicated with the sensor data line 20 so as to acquire corresponding signals. In order to protect the protective line 5, it is preferable that the protective line 5 is provided in the high-pressure braided wound hose 22. In general, the high-pressure braided and wound rubber tube 22 is internally wrapped with the oil inlet tube 17, the oil return tube 18 and the sensor data wire 20, and the wrapping mode is section-by-section wrapping, and the joint is sleeved. The high-pressure braided and wound rubber tube 22 is led to the outside of the concrete protection block 2 along the tube groove 16 and is fixed on the steel twisted wire.
In actual detection, the periphery of the testing device 1 is provided with a concrete protection block 2, wherein the top and the bottom of the concrete protection block 2 are respectively flush with the bearing plate structure 7 at the top and the bearing plate structure 7 at the bottom of the testing device 1. Preferably, an undisturbed soil structure 113 is arranged below the concrete protection block 2 and the testing device 1, a backfill soil cushion layer 112 is arranged above the concrete protection block 2 and the testing device 1, and a backfill soil or a weight layer 111 is arranged above the backfill soil cushion layer 112. Generally, the shape of the concrete protection block 2 is a truncated cone shape or a cylindrical shape, the side surface of the concrete protection block is provided with a lead pipe groove 16, and the lead pipe groove 16 is formed by welding channel steel.
When in actual use, after the test device 1 is manufactured and assembled, waterproof detection, various sensor calibration and push-out load calibration are carried out, and numerical connection between different sensors and push-out loads is established. Before the testing device 1 is used, a well or a hole is dug into a soil body, and a concrete protection block 2 wrapping the testing device 1 is placed on the top surface of an undisturbed soil structure 113 to be tested, as shown in fig. 3. Depending on the area of the working surface, 1 table may be selected to be placed or a plurality of tables may be symmetrically placed, as shown in fig. 4. The loading system 3 and the parameter acquisition system 4 are placed on top of the well or hole and set up a working platform. The oil inlet pipe, the oil return pipe and the sensor data line are wrapped in the protection pipeline 5 and are fixed along the wall of an excavated hole or a well wall, one end of the protection pipeline is connected with the testing device 1, and the other end of the protection pipeline is connected with the loading system 3 and the parameter acquisition system 4. And secondly, restoring the overlying pressure of the test soil body by adopting backfill soil body or backfill soil cushion layer and equal weight substitution. The compactness of the backfill soil body and the soil cushion layer is controlled, and the consistency of the compaction degree and the actual measurement compactness when the backfill soil body and the soil cushion layer are excavated to the soil layer is ensured. When the 'soil cushion layer + equal weight replacement' is adopted, the height of the backfill soil cushion layer from the top surface of the testing device is not less than 5 times of the diameter of the bearing plate. And after the overlying stress is recovered, recovering the original water level height of the undisturbed soil body, ensuring consistency with the soil body before excavation, and standing for more than 15 days. After restoring the soil body overburden pressure and the initial pore water pressure, the hydraulic load is applied to the testing device 1 in a grading way through the oil inlet pipe by the pressure stabilizing pump station 19 in the loading system in the working platform, the jack 6 in the testing device 1 is pushed out in a bidirectional way under the action of the hydraulic load, and the pushing-out sequence is that the undisturbed soil body is extruded downwards firstly, and then the remolded soil body is extruded upwards. The loading mode adopted by the testing device is a method for maintaining the relative stability of load sedimentation in a grading way, the load is graded and increased by 250 to 500kPa at each stage, and the sedimentation data is monitored according to different interval time. When the continuous 2h settling rate does not exceed 0.1mm/h, the next stage load is applied until one of the following occurs, terminating the test: (a) The accumulated push-out amount reaches the maximum push-out amount of the test design; (b) The push-out load reaches the maximum push-out load of the test design; (c) The load settlement amount of the current stage is 5 times larger than that of the previous stage, and the load settlement curve is obviously and steeply reduced; (d) The 24 hour settling rate at a certain level of loading did not meet the relatively stable criteria. In the pushing process, the oil pressure sensor, the soil pressure sensor 12, the pore water pressure gauge, the displacement sensor and the inclinometer in the testing device record data, the measured data are converted into electric signals, and the electric signals are transmitted to the wireless acquisition module through the sensor lead wires and are transmitted to data analysts remotely and wirelessly. After mutual checking and verification of sensors embedded in the testing device, test values of load-settlement deformation curves and ultimate bearing capacities of deep undisturbed soil and remolded soil are measured, the relation between undisturbed soil and disturbance remolded soil mechanical parameters is determined, and the soil mechanical parameters are determined together with a conventional in-situ test method and an indoor test result. The bottom soil pressure box and the pore water pressure gauge have long-term monitoring conditions after the push-out test is finished, and can be used for carrying out long-term rheological property tests of undisturbed soil and remolded soil under high water pressure and high confining pressure.
The invention effectively improves the accuracy of deep soil mechanical parameter selection, has obvious technical advantages and has very broad market popularization prospect.
Claims (4)
1. Two-way deep soil body mechanical parameter normal position testing arrangement, its characterized in that: the device comprises a parameter acquisition system (4), a pair of jacks (6) and a shell (9) fixedly arranged between the pair of jacks (6), wherein the pushing-out directions of the jacks (6) at two sides of the shell (9) are arranged in a back-to-back mode, and the tops of the jacks (6) are respectively provided with a bearing plate structure (7) correspondingly; the parameter acquisition system comprises a displacement sensor (14) and an inclination sensor (15), wherein the moving part of the displacement sensor (14) is arranged in a piston rod of a jack (6), the inclination sensor (15) is arranged in a shell (9), the parameter acquisition system comprises a soil pressure sensor (12) and a pore water pressure gauge (13), the soil pressure sensor (12) and the pore water pressure gauge (13) are arranged on the bottom surface of a bearing plate structure (7), the bottom surfaces of the soil pressure sensor (12) and the pore water pressure gauge (13) are all level with the bottom surface of the bearing plate structure (7), the parameter acquisition system comprises a loading system (3), the loading system (3) consists of an oil inlet pipe (17), an oil return pipe (18) and a pressure stabilizing pump station (19), one end of the oil inlet pipe (17) and one end of the oil return pipe (18) are communicated with the pressure stabilizing pump station (19), the other end of the oil inlet pipe (17) and the oil return pipe (18) are communicated with the jack (6), the parameter acquisition system (4) comprises a protection pipeline (5), the oil inlet pipe (17) and the oil return pipe (18) are arranged in the protection pipeline (5) and the wireless acquisition module (21) is communicated with the wireless data acquisition module (20), the protection pipeline (5) is arranged in the high-pressure braided winding rubber tube (22);
the jack (6) is pushed out in a bidirectional way under the action of oil pressure load, and the pushing-out sequence is that the undisturbed soil body is extruded downwards firstly, and then the remolded soil body is extruded upwards.
2. The test structure realized by the bidirectional deep soil body mechanical parameter in-situ test device as claimed in claim 1, which is characterized in that: the periphery of testing arrangement (1) is provided with concrete protection piece (2), wherein, top and the bottom of concrete protection piece (2) are flush with bearing plate structure (7) at the top and bearing plate structure (7) at the bottom of testing arrangement (1) respectively.
3. The test structure realized by the bidirectional deep soil body mechanical parameter in-situ test device as claimed in claim 2, which is characterized in that: the concrete protection block (2) and the testing device (1) are provided with undisturbed soil structures (113), and backfill soil cushions (112) are arranged above the concrete protection block (2) and the testing device (1).
4. A test structure implemented by the bidirectional deep soil mechanical parameter in-situ test device as claimed in claim 3, which is characterized in that: and a backfill or weight layer (111) is arranged above the backfill cushion layer (112).
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| CN202011348945.4A CN112525711B (en) | 2020-11-26 | 2020-11-26 | Bidirectional deep soil mechanical parameter in-situ testing device and testing structure |
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| CN202011348945.4A CN112525711B (en) | 2020-11-26 | 2020-11-26 | Bidirectional deep soil mechanical parameter in-situ testing device and testing structure |
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| CN112525711B true CN112525711B (en) | 2023-08-22 |
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| CN112525711A (en) | 2021-03-19 |
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