CN114910367A - Indoor static sounding and bending element combined test system suitable for soil body size strain measurement - Google Patents
Indoor static sounding and bending element combined test system suitable for soil body size strain measurement Download PDFInfo
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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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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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
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- 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
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The invention relates to the technical field of geotechnical engineering physical simulation, and provides a set of indoor static sounding and bending element combined test system suitable for soil mass size strain measurement. The invention can realize continuous and stable penetration of the static sounding probe under different confining pressure and dynamic loading conditions, realize static sounding and triaxial shear indoor tests under different soil sample sizes, has the advantages of high precision, quick response and good stability, can perform servo control under stress or displacement conditions, and can simulate cyclic loading characteristics under different field conditions; the sample preparation device and the loading test device are integrated and are both completed by the control system, the operation is simple and convenient, and the complex operation flow in the in-situ test is avoided.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering physical simulation.
Background
In recent years, the construction of the infrastructure of China is rapidly developed, and geotechnical engineering design needs accurate soil layer information. The method is an important step for analyzing the liquefaction risk of the underground soil body and evaluating the bearing capacity of the foundation by determining the soil body property, and because the undisturbed soil body is difficult to test, the geotechnical engineering field test usually depends on dynamic penetration test (SPT) or static penetration test (CPT). The static sounding in-situ test technology is a relatively mature and reliable survey means for cohesive soil and sandy soil in geotechnical engineering survey, and becomes one of in-situ field test and exploration methods by virtue of the advantages of continuous data measurement, high precision, strong repeatability, low cost and the like.
The static penetration resistance value q is established in the current national, industrial and local specifications and standards c Characteristic value f of bearing capacity of foundation soil ak Compression modulus E s Shear wave velocity V s And the like. The indoor static sounding and bending element testing has the characteristics of convenience and quickness, and if the correlation between the indoor static sounding and bending element testing and in-situ testing parameters can be established, a large amount of exploration cost and construction period can be saved. In the process of penetration of the static cone penetration test, the resistance of the cone tip can be increased along with the increase of the effective stress of the soil sample, the resistance values of the cone tips at different depths are compared by a common normalization method at present, and a relational expression for describing the change of the resistance of the cone tip along with the depth does not exist, so that the magnitude strain of the soil body is measured by combining indoor static cone penetration test and a bending element, and the correlation relation between indoor test and in-situ test parameters is established, so that the deep research on the property of the tested soil sample can be more effectively carried out.
Although the indoor model test is an important means of geotechnical research, the size effect of the model exists in the static sounding indoor calibration tank test, the result of the model is different from the result of the in-situ test, and the size effect of the model needs to be corrected. At present, the standardized method is widely applied to the static cone penetration resistance data, such as the normalized cone penetration resistance relational expression established in an exponential form in the document "Cetin K O, Isik NS. basic assessment of stress normalization for CPT data. journal of geotechnical and geoenvironmental engineering,2007,133(7):887 + 897". At present, no equipment can simultaneously carry out indoor static sounding and bending element tests, and the existing indoor static sounding test has large error and low automation degree. Therefore, an indoor static sounding and bending element combined test system suitable for soil body size strain measurement is urgently needed, and the indoor static sounding and bending element combined test system comprises a dynamic loading device which is high in precision, quick in response, stable in loading and capable of simultaneously completing static sounding and bending element tests.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, develops an indoor static sounding and bending element combined test system suitable for soil mass size strain measurement, and comprises a dynamic loading device which has high precision, quick response and stable loading and can simultaneously complete static sounding and bending element tests.
The purpose of the invention can be realized by the following technical scheme:
a set of indoor static sounding and bending element combined test system suitable for soil body size strain measurement comprises a sample preparation system capable of changing the size of a soil sample, a test soil sample boundary power control system, a soil sample stress strain data measuring system, a soil sample shear wave speed test system and a soil sample static sounding test system.
The sample preparation system capable of changing the size of the soil sample can prepare test soil samples (14) with different sizes. Specifically, the system component mainly comprises a sample cap (4), a flexible membrane (13), a lifting device (16) and a pressure chamber bottom plate (7). The volume of the test soil samples (14) with different sizes is calculated according to the density and the mass of the soil samples. The test soil sample (14) is arranged on the pressure chamber bottom plate (7). The height of the pressure chamber bottom plate (7) is adjusted by controlling the lifting type lifting device (16), a test soil sample is made into a flexible membrane (13) printed in a 3D mode by a sand rain method, and the test soil sample (14) with different sizes can be prepared by covering the test soil sample (14) with the sample cap (4) and wrapping the test soil sample with the flexible membrane (13).
The test soil sample boundary power control system can change the internal stress state of the test soil sample (14). Specifically, the system component mainly comprises a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), a pressure chamber bottom plate (7), an external pore water pressure gauge (8), a confining pressure control cavity (12), a flexible membrane (13), an external confining pressure loading device (15), a lifting type lifting device (16) and a test control system (17). The power control of the test soil sample boundary is completed by regulating and controlling the confining pressure control cavity (12) by the test control system (17). And the confining pressure control cavity (12) is a closed system formed by enclosing a pressure chamber top cover (3), a pressure chamber bottom plate (7) and a side wall. The sample cap (4) and the pressure chamber bottom plate (7) are provided with pipe holes, and two ends of the soil sample drainage pipeline (5) respectively penetrate through the pipe holes of the sample cap (4) and the pressure chamber bottom plate (7). The bottom of the pressure chamber bottom plate (7) is also provided with two openings which are respectively connected with an external pore water pressure gauge (8) and an external confining pressure loading device (15). Connecting a soil sample drainage pipeline (5) with a prepared test soil sample (14), and recording the pore water pressure of the soil sample by an external pore water pressure meter (8); the testing device is characterized in that a pressure chamber top cover (3) is connected with a pressure chamber bottom plate (7) to form a closed confining pressure control cavity (12), an external confining pressure loading device (15) is adjusted by using a test control system (17), the confining pressure control cavity (12) is regulated and controlled through the air input of the loading device, and when a testing soil sample (14) is subjected to confining pressure servo control, the pore water pressure of the soil sample can be controlled through an external pore water pressure gauge (8), so that the purpose of testing the boundary power control of the soil sample is achieved.
The soil sample stress-strain data measuring system can record the stress strain of a tested soil sample (14) in real time. Specifically, the system component mainly comprises a pressure chamber bottom plate (7), a test soil sample (14), a lifting type lifting device (16), a test control system (17) and data recording and analyzing equipment (18). The data recording and analyzing equipment (18) can be used for carrying out stress-strain analysis on the soil sample. The confining pressure control is carried out on the confining pressure control cavity (12) through the test control system (17), after a preset confining pressure value is reached, a triaxial shear test is carried out on the test soil sample (14) through the lifting type lifting device (16), and a test result can be obtained through the data recording and analyzing equipment (18). Similarly, subsequent shear wave velocity or static cone penetration tests of the test soil sample (14) may also be obtained by the data logging and analysis device (18).
The soil sample shear wave velocity testing system can monitor small strain deformation of a tested soil sample (14). Specifically, the system component mainly comprises a sample cap (4), an embedded bending element (6), a pressure chamber bottom plate (7), a test control system (17) and data recording and analyzing equipment (18). The embedded bending element (6) is arranged in the sample cap (4) and the pressure chamber bottom plate (7), the upper bending element device can emit shear wave velocity, and the lower bending element device receives wave velocity signals. When a triaxial shear or static sounding test is carried out, the real-time deformation condition of the soil sample in the triaxial shear or static sounding test can be presumed through shear wave velocity signals, and the test result is obtained through data recording and analyzing equipment (18).
The soil sample static sounding test system can be used for testing the static sounding soil body property of a test soil sample (14). Specifically, the system component mainly comprises an equipment top cover (1), an external feeler lever (2), a pressure chamber top cover (3), a sample cap (4), an external loading device connecting piece (9), a detachable loading device (10) and multifunctional mini-feeler equipment (11). The multifunctional mini sounding equipment (11) is connected with the external sounding rod (2) through a detachable loading device (10), and the external sounding rod (2) penetrates through the center of the pressure chamber top cover (3) and is installed on an external loading device connecting piece (9). The center of the sample cap (4) is provided with a hole, the multifunctional mini penetration test equipment (11) is arranged at the hole of the sample cap (4), when a test is started, the multifunctional mini penetration test equipment (11) can be pressed into a test soil sample (14) by using an external loading device of an external loading device connecting piece (9) to obtain soil body parameters, and a test result is obtained through data recording and analyzing equipment (18).
Furthermore, the multifunctional mini penetration test device (11) comprises a detachable force transducer (19), an internal penetration test rod (20), a sleeve type monitoring device (21), a probe sealing rubber ring (22) and a static penetration test probe (23);
the multifunctional mini sounding equipment (11) adopts a rigid sleeve structure, and an internal sounding rod (20) is positioned in the center of the sleeve; the sleeve type monitoring device (21) is positioned at the lower half part of the internal feeler lever (20), and a pore pressure sensor and a force measuring sensor are arranged in the sleeve type monitoring device (21) and can monitor the interaction force of the multifunctional mini-sounding device (11) in the process of penetrating a test soil sample (14); the probe sealing rubber ring (22) and the static sounding probe (23) are arranged at the tail end of the internal sounding rod (20); the sleeve type monitoring device (21), the probe sealing rubber ring (22) and components protect the pore pressure sensor and the force sensor, so that the influence of other non-test factors on the measurement result in the process that the multifunctional mini penetration equipment (11) penetrates into the test soil sample (14) is avoided; the detachable force sensor (19) is connected with the internal feeler lever (20), the vertical stress generated by the interaction of the static sounding probe (23) and the test soil sample (14) in the penetration process of the multifunctional mini-penetration equipment (11) is recorded and transmitted, and the detachable force sensor (19) is replaced when other data needs to be measured in a test; the sensor monitoring data is transmitted to the data recording and analyzing device (18) during penetration of the internal feeler lever (20) into the test soil sample (14).
Compared with the prior art, the invention has the following advantages:
1) the general test system can not simultaneously carry out the cooperative measurement of the magnitude strain of the soil body, but the invention can combine the triaxial shear test of the soil body with the bending element and static sounding test technology and simultaneously carry out the magnitude strain measurement of the soil body.
2) The existing triaxial shear test equipment cannot perform indoor static sounding test, and the model is provided with an internal loading system and an external loading system, so that the static sounding probe can be continuously and stably penetrated under different confining pressure and dynamic loading conditions.
3) The existing triaxial shear test equipment pressure chamber base is single in size, the model pressure chamber base can be replaced, and static sounding and triaxial shear indoor tests under different soil sample sizes can be realized.
4) The test control system can carry out cyclic loading on the test soil sample, the loading structure has the advantages of high precision, quick response and good stability, servo control can be carried out under stress or displacement conditions, and cyclic loading characteristics under different field conditions can be simulated.
5) To inviscid soil sample preparation process, avoided complicated loading and unloading sample process, only need adjust dismantlement formula loading attachment, trade it for inviscid soil sand rain legal system appearance ware, control over-and-under type lifting device adjustment sand rain legal system appearance ware and test soil sample distance can prepare the inviscid soil sample of different target compactness fast.
6) In the process from the preparation of the test sample to the recording of the final data, the sample preparation device and the loading test device are integrated and are all completed by the control system, the operation is simple and convenient, and the complex operation flow in the in-situ test is avoided.
Drawings
FIG. 1 is a perspective view of the system of the present invention;
FIG. 2 is an explanatory diagram of the multifunctional mini-penetration device of the present invention;
reference numerals:
1. a top cover of the equipment; 2. an external feeler lever; 3. a pressure chamber top cover; 4. a sample cap; 5. a soil sample drainage line; 6. an embedded bending element; 7. a pressure chamber floor; 8. a pore water pressure gauge is externally connected; 9. an external loading device connection; 10. a detachable loading device; 11. a multifunctional mini sounding device; 12. a confining pressure control cavity; 13. a flexible film; 14. testing a soil sample; 15. the external confining pressure loading device; 16. a lifting device; 17. a test control system; 18. data recording and analysis equipment; 19. a detachable force cell sensor; 20. an internal feeler lever; 21. a sleeve-type monitoring device; 22. a probe is sealed with a rubber ring; 23. a static cone penetration probe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, a set of indoor static sounding and bending element combined test system suitable for soil mass size strain measurement includes a sample preparation system capable of changing the size of a soil sample, a test soil sample boundary dynamic control system, a soil sample stress strain data measurement system, a soil sample shear wave velocity test system, and a soil sample static sounding test system.
The sample preparation system component capable of changing the size of the soil sample mainly comprises a sample cap (4), a flexible membrane (13) and a lifting type lifting device (16). During sample preparation, the volume of a test soil sample (14) with different sizes is calculated according to the density and the mass of the soil sample, the test soil sample (14) is placed on a pressure chamber bottom plate (7), then a lifting type lifting device (16) is controlled to adjust the height of the pressure chamber bottom plate (7), the soil sample is prepared in a 3D printed flexible film (13) by a sand rain method, a sample cap (4) covers the test soil sample (14) and is wrapped by the flexible film (13), and the test soil sample (14) with different sizes can be prepared.
The test soil sample boundary power control system mainly comprises a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), a pressure chamber bottom plate (7), an external pore water pressure gauge (8), a confining pressure control cavity (12), a flexible membrane (13), an external confining pressure loading device (15), a lifting type lifting device (16) and a test control system (17). And the confining pressure control cavity (12) is a closed system formed by enclosing a pressure chamber top cover (3), a pressure chamber bottom plate (7) and a side wall. The sample cap (4) and the pressure chamber bottom plate (7) are provided with pipe holes, and two ends of the soil sample drainage pipeline (5) respectively penetrate through the pipe holes of the sample cap (4) and the pressure chamber bottom plate (7). The bottom of the pressure chamber bottom plate (7) is also provided with two openings which are respectively connected with an external pore water pressure gauge (8) and an external confining pressure loading device (15). After equipment system appearance is accomplished, be connected soil sample drainage line (5) with prepared test soil sample (14), be connected pressure chamber top cap (3) and pressure chamber bottom plate (7) afterwards, form inclosed confined confining pressure control chamber (12), utilize experimental control system (17) to adjust external confining pressure loading device (15), control chamber (12) are confined to regulation and control through loading device air input, when test soil sample (14) receive when confining pressure servo control pore water pressure of accessible external pore water pressure gauge (8) control soil sample, thereby reach test soil sample (14) border power control purpose.
The soil sample stress-strain data measuring system mainly comprises an equipment top cover (1), an external feeler lever (2), a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), a pressure chamber bottom plate (7), an external pore water pressure gauge (8), a confining pressure control cavity (12), a flexible membrane (13), a test soil sample (14), an external confining pressure loading device (15), a lifting type lifting device (16), a test control system (17) and data recording and analyzing equipment (18). Confining pressure servo control is carried out on the confining pressure control cavity (12) through a test control system (17), then a lifting type lifting device (16) is utilized to carry out triaxial shear test on a test soil sample (14) under a set confining pressure, and a test result can be obtained through data recording and analyzing equipment (18). Similarly, subsequent shear wave velocity or static cone penetration tests of the test soil sample (14) may also be obtained by the data logging and analysis device (18).
The soil sample shear wave velocity testing system mainly comprises an equipment top cover (1), an external feeler lever (2), a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), an embedded bending element (6), a pressure chamber bottom plate (7), an external pore water pressure meter (8), a confining pressure control cavity (12), a flexible membrane (13), a testing soil sample (14), an external confining pressure loading device (15), a lifting device (16), a testing control system (17) and data recording and analyzing equipment (18). The embedded bending elements (6) are arranged in the sample cap (4) and the pressure chamber bottom plate (7), when a test soil sample (14) is prepared, the embedded bending elements (6) on the upper portion transmit signals through the transmitter, shear waves are transmitted to the bending element receiver on the lower portion along the axial direction of the test soil sample (14), the measurement of the shear wave speed of the test soil sample (14) in the test process can be completed, and the real-time deformation condition of the soil sample in a triaxial shear or static sounding test is presumed through shear wave speed signals in the experiment control system and the data recording and analyzing equipment (18). The shear wave velocity is calculated by the formula:
in the formula: v (t) is the shear wave velocity, D (t) is the distance between the bending element transmitting end and the receiving end piezoelectric ceramic shear wave velocity test sensor, t 1 Time corresponding to the peak of the transmitted wave, t 2 The time corresponding to the peak of the transmitted wave in the received wave.
The static sounding test system mainly comprises an equipment top cover (1), an external sounding rod (2), a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), an embedded bending element (6), a pressure chamber bottom plate (7), an external pore water pressure meter (8), an external loading device connecting piece (9), a detachable loading device (10), multifunctional mini sounding equipment (11), a confining pressure control cavity (12), a flexible membrane (13), a test soil sample (14), an external confining pressure loading device (15), a lifting type lifting device (16), a test control system (17), data recording and analyzing equipment (18), a detachable force measuring sensor (19), an internal sounding rod (20), a strain gauge sleeve structure (21), a probe sealing rubber ring (22) and a static sounding probe (23). Before a prepared test soil sample (14) is subjected to static sounding test, the multifunctional mini-sounding device (11) is connected with an external sounding rod (2) through a detachable loading device (10), and then is installed on an external loading device connecting piece (9). When the test is carried out, the multifunctional mini primary detection equipment penetrates into a test soil body at a constant speed along a reserved hole channel in the sample cap (4) under the driving of the power of the internal loading device. In the penetration process, the test soil sample (14) can generate resistance to the multifunctional mini penetration equipment (11), and then the cone tip resistance, the friction resistance of the side wall of the cone rod and the pore water pressure of the soil body along the depth change in the penetration process of the mini penetration equipment are recorded by the sleeve type monitoring device (21), so that the parameters of the test soil sample (14) can be obtained.
More preferably, before the multifunctional mini penetration test equipment (11) starts to test, the embedded bending element (6) signal transmitter is started, the signal receiver can receive a complete shear wave velocity signal of a test soil sample (14), when the multifunctional mini penetration test equipment (11) penetrates into the test soil sample (14), the signal receiver can receive different shear wave velocity signals, different shear wave velocity information before and after transmission is compared, and the result can be compared with a static penetration test result, so that soil body parameters are estimated.
More preferably, after the triaxial shear test is carried out on the test soil sample (14), the relation between the soil stress and the strain is obtained. The method comprises the steps of utilizing multifunctional mini penetration equipment (11) to conduct static penetration indoor calibration test on a test soil sample (14), obtaining the cone tip resistance, the cone rod side wall friction resistance and the soil body pore water pressure of a shearing sample, comparing the parameters with the parameters obtained by the mini penetration equipment, and observing the parameter change of the test soil sample (14) before and after shearing.
The indoor static sounding and bending element combined test system suitable for soil body size strain measurement provided by the embodiment has the following test procedures and operation steps:
step 1: after preparing the saturated sand soil sample, the external pore water pressure gauge 8 is opened, then the test soil sample 14 is fixed and aligned with the embedded bending element 6, the test control system 17 is opened, and the lifting type lifting device 16 is operated to lift the pressure chamber until the pressure chamber is contacted with the multifunctional mini sounding device 11.
Step 2: and (3) installing a confining pressure cavity, avoiding touching the test soil sample 14 in the process, diagonally screwing bolts, and correcting the multifunctional mini sounding device 11 and the embedded bent element 6. And then, opening the external pore water pressure gauge 8, and after the confining pressure cavity is filled with water, opening the external confining pressure loading device 15 to adjust the confining pressure control chamber 12.
And step 3: the confining pressure is kept stable by using a test control system 17, and then the test soil sample 14 is subjected to saturation consolidation.
And 4, step 4: the shear wave speed of the test soil sample 14 is tested by using the embedded bending element 6, and data is transmitted and recorded through the test control system 17.
And 5: the test soil sample 14 is uniformly lifted by using the lifting type lifting device 16, and the tested soil sample is monitored by the multifunctional mini sounding equipment 11.
Step 6: when the sounding rod completely enters the test soil sample 14, the lifting type lifting device 16 is closed, and the shear wave speed of the test soil sample 14 is tested through the embedded bending element 6 again.
And 7: and (4) arranging the data of the sensors to obtain a test relation of the size strain of the soil under the joint measurement of the static sounding and the bending element.
Claims (7)
1. A set of indoor static sounding and bending element combined test system suitable for soil body size strain measurement is characterized by comprising a sample preparation system capable of changing the size of a soil sample, a test soil sample boundary power control system, a soil sample stress strain data measuring system, a soil sample shear wave speed test system and a soil sample static sounding test system.
2. An indoor static sounding and bending element combined test system suitable for soil mass size strain measurement as claimed in claim 1, wherein the sample preparation system capable of changing the size of the soil sample is used for preparing test soil samples (14) with different sizes; the system component comprises a sample cap (4), a flexible membrane (13), a lifting type lifting device (16) and a pressure chamber bottom plate (7); the volume of the test soil samples (14) with different sizes is calculated according to the density and the mass of the soil samples;
the test soil sample (14) is arranged on the pressure chamber bottom plate (7); the height of the pressure chamber bottom plate (7) is adjusted by controlling the lifting type lifting device (16), a test soil sample is made into a flexible membrane (13) printed in a 3D mode by a sand rain method, and the test soil sample (14) with different sizes can be prepared by covering the test soil sample (14) with the sample cap (4) and wrapping the test soil sample with the flexible membrane (13).
3. The indoor static sounding and bending element combined test system suitable for soil mass size strain measurement as recited in claim 1, wherein the test soil sample boundary dynamic control system is used for changing the internal stress state of the test soil sample (14); the system component comprises a pressure chamber top cover (3), a sample cap (4), a soil sample drainage pipeline (5), a pressure chamber bottom plate (7), an external pore water pressure gauge (8), a confining pressure control cavity (12), a flexible membrane (13), an external confining pressure loading device (15), a lifting type lifting device (16) and a test control system (17); the power control of the test soil sample boundary is completed by regulating and controlling the confining pressure control cavity (12) by a test control system (17);
the confining pressure control cavity (12) is a closed system formed by enclosing a pressure chamber top cover (3), a pressure chamber bottom plate (7) and a side wall; pipe holes are formed in the sample cap (4) and the pressure chamber bottom plate (7), and two ends of the soil sample drainage pipeline (5) penetrate through the pipe holes of the sample cap (4) and the pressure chamber bottom plate (7) respectively; the bottom of the pressure chamber bottom plate (7) is also provided with two openings which are respectively connected with an external pore water pressure gauge (8) and an external confining pressure loading device (15);
connecting a soil sample drainage pipeline (5) with a prepared test soil sample (14), and recording the pore water pressure of the soil sample by an external pore water pressure meter (8); the pressure chamber top cover (3) is connected with the pressure chamber bottom plate (7) to form a closed confining pressure control cavity (12), an external confining pressure loading device (15) is adjusted by using a test control system (17), the confining pressure control cavity (12) is regulated and controlled through the air input of the loading device, and when a test soil sample (14) is subjected to confining pressure servo control, the pore water pressure of the soil sample is controlled through an external pore water pressure gauge (8), so that the purpose of testing the boundary power control of the soil sample is achieved.
4. An indoor static sounding and bending element combined test system suitable for soil mass size strain measurement as claimed in claim 1, wherein the soil sample stress strain data measurement system is used for recording the stress strain of a test soil sample (14) in real time; the system component comprises a pressure chamber bottom plate (7), a test soil sample (14), a lifting type lifting device (16), a test control system (17) and data recording and analyzing equipment (18);
the data recording and analyzing equipment (18) is used for analyzing the stress and strain of the soil sample; the confining pressure control is carried out on the confining pressure control cavity (12) through the test control system (17), after a preset confining pressure value is reached, a triaxial shear test is carried out on the test soil sample (14) through the lifting type lifting device (16), and a test result is obtained through the data recording and analyzing equipment (18).
5. An indoor static sounding and bending element combined test system suitable for soil mass size strain measurement as claimed in claim 1, wherein the soil sample shear wave speed test system is used for small strain deformation monitoring of a test soil sample (14); the system component comprises a sample cap (4), an embedded bending element (6), a pressure chamber bottom plate (7), a test control system (17) and data recording and analyzing equipment (18);
the embedded bending element (6) is arranged in the sample cap (4) and the pressure chamber bottom plate (7), the upper bending element equipment can transmit shear wave velocity, and the lower bending element equipment receives wave velocity signals; when a triaxial shear or static sounding test is carried out, the real-time deformation condition of the soil sample in the triaxial shear or static sounding test is presumed through shear wave velocity signals, and the test result is obtained through data recording and analyzing equipment (18).
6. The indoor static sounding and bending element combined test system suitable for soil mass magnitude strain measurement according to claim 1,soil sample static sounding test systemThe static sounding soil property testing device is used for testing the static sounding soil property of the testing soil sample (14); the system component comprises an equipment top cover (1), an external feeler lever (2), a pressure chamber top cover (3), a sample cap (4), an external loading device connecting piece (9), a detachable loading device (10) and multifunctional mini-feeler equipment (11);
the multifunctional mini sounding equipment (11) is connected with the external sounding rod (2) through a detachable loading device (10), and the external sounding rod (2) penetrates through the center of the pressure chamber top cover (3) and is installed to an external loading device connecting piece (9); the center of the sample cap (4) is provided with a hole, the multifunctional mini sounding equipment (11) is arranged at the hole of the sample cap (4), when a test is started, the multifunctional mini sounding equipment (11) can be pressed into a test soil sample (14) by using an external loading device of the external loading device connecting piece (9) to obtain soil body parameters, and a test result is obtained through the data recording and analyzing equipment (18).
7. An indoor static sounding and bending element combined test system suitable for soil mass size strain measurement according to claim 6, wherein the multifunctional mini sounding device (11) comprises a detachable load cell (19), an internal feeler lever (20), a sleeve type monitoring device (21), a probe sealing rubber ring (22) and a static sounding probe (23);
the multifunctional mini sounding equipment (11) adopts a rigid sleeve structure, and an internal sounding rod (20) is positioned in the center of the sleeve; the sleeve type monitoring device (21) is positioned at the lower half part of the internal feeler lever (20), and a pore pressure sensor and a force sensor are arranged in the sleeve type monitoring device (21) and can monitor the interaction force of the multifunctional mini-feeler device (11) in the process of penetrating into the test soil sample (14); the probe sealing rubber ring (22) and the static sounding probe (23) are arranged at the tail end of the internal sounding rod (20); the sleeve type monitoring device (21), the probe sealing rubber ring (22) and components protect the pore pressure sensor and the force sensor, so that the influence of other non-test factors on the measurement result in the process that the multifunctional mini penetration equipment (11) penetrates into the test soil sample (14) is avoided; the detachable force sensor (19) is connected with the internal feeler lever (20), the vertical stress generated by the interaction of the static sounding probe (23) and the test soil sample (14) in the penetration process of the multifunctional mini-penetration equipment (11) is recorded and transmitted, and the detachable force sensor (19) is replaced when other data needs to be measured in a test; the sensor monitoring data is transmitted to the data recording and analyzing device (18) during penetration of the internal feeler lever (20) into the test soil sample (14).
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| CN202210435710.1A CN114910367A (en) | 2022-04-24 | 2022-04-24 | Indoor static sounding and bending element combined test system suitable for soil body size strain measurement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354641A (en) * | 2022-09-14 | 2022-11-18 | 中国科学院力学研究所 | Underwater static sounding penetration test device and method based on wave current environment simulation |
| CN115639079A (en) * | 2022-11-04 | 2023-01-24 | 湖北顶华工程勘察设计有限公司 | Static sounding test system and method for restoring soil body field state indoors |
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2022
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115354641A (en) * | 2022-09-14 | 2022-11-18 | 中国科学院力学研究所 | Underwater static sounding penetration test device and method based on wave current environment simulation |
| CN115639079A (en) * | 2022-11-04 | 2023-01-24 | 湖北顶华工程勘察设计有限公司 | Static sounding test system and method for restoring soil body field state indoors |
| CN115639079B (en) * | 2022-11-04 | 2023-10-20 | 湖北顶华工程勘察设计有限公司 | Static cone penetration test system and method for restoring soil body site state indoors |
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