Rock-soil body temperature-control dynamic characteristic test system and test method

A technology of dynamic characteristics and test system, applied in strength characteristics, using stable tension/pressure to test material strength, measuring devices, etc., can solve the problems of reduced viscosity, long time required for test temperature, and resistance of various components of the instrument. High temperature requirements and other issues, to achieve the effect of easy loading and unloading

Active Publication Date: 2015-05-06
NINGBO UNIV
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although this type of device saves the development process of the instrument, the cost of establishing a temperature-controlled laboratory is relatively high, the test environment is poor, and the requirements for high temperature resistance of each component of the instrument are high.
[0005] (2) The heating mode in the pressure chamber uses heating coils, heating tubes, heating rods, and heating plates to heat the fluid. This heating method directly heats the fluid, which can better meet the test temperature requirements, but it is not easy for the pressure chamber under high confining pressure. The liquid is heated evenly, so that the temperature of the sample is not uniform
[0006] (3) In the pressure outdoor heating mode, the coil is wound outside the pressure chamber, and the fluid in the pressure chamber is heated by the heating coil. Since the temp

Method used

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  • Rock-soil body temperature-control dynamic characteristic test system and test method
  • Rock-soil body temperature-control dynamic characteristic test system and test method

Examples

Experimental program
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Example Embodiment

[0037] Example one

[0038] A temperature control dynamic characteristic test system for rock and soil, such as figure 1 with figure 2 As shown, it includes a dynamic triaxial pressure chamber and a temperature control device. The dynamic triaxial pressure chamber includes a pressure chamber cylinder 3. The upper opening of the pressure chamber cylinder 3 is provided with a pressure chamber upper cover 2 and a pressure chamber cylinder 3 A chassis 9 is provided at the bottom, a piston rod 8 is longitudinally provided in the center of the bottom of the pressure chamber cylinder 3, and an upstream force rod 20 is longitudinally provided in the pressure chamber cylinder 3 above the piston rod 8. The lower end of the upstream force rod 20 and the piston The sample 17 is placed between the upper ends of the rod 8, the bottom of the chassis 9 is provided with a loading frame bearing platform 12, a loading frame beam 25 is provided directly above the pressure chamber upper cover 2, and ...

Example Embodiment

[0057] Example two

[0058] A test method for temperature control dynamic characteristics of rock and soil. It is mainly used to measure the dynamic parameters of soil samples at different temperatures, including pore pressure sensor 16, temperature sensor 21, pressure sensor 24, axial displacement sensor 31, The deformation sensor 32, the confining pressure sensor 33 and the lateral displacement sensor 34, the specific structure of the test system is as described in the above embodiment 1 and as figure 1 with figure 2 As shown, the specific steps of the method are as follows:

[0059] (1) Sample installation

[0060] After soil sample 17 is saturated with water head, saturated with vacuum exhaust, or saturated with back pressure, stick 6-7 strips of filter paper on the side of sample 17, and stick filter paper and permeable stone 20 on both ends of the sample. 17 Coat the latex film 19, then place the sample 17 on the piston rod 8 in the pressure chamber cylinder 3, and control th...

Example Embodiment

[0081] Example three

[0082] Using the temperature-controlled triaxial test system of Example 1, select a project in Zhuangshi, Zhenhai District, Ningbo ② 2 Layer silty silty clay is subjected to isotropic consolidation undrained dynamic triaxial test. The basic physical and mechanical indexes and test schemes of the soil samples are shown in Table 1 and Table 2, respectively.

[0083] Table 1 Basic physical and mechanical indexes of soil samples

[0084]

[0085] Table 2 Test plan

[0086] Confining pressure / kPa100 Axial pressure / kPa100 Static deflection stress / kPa30 Dynamic stress / kPa30 Frequency / Hz1 Vibration waveform Sine wave Vibration times / N500 Temperature / ℃ 22 (room temperature), 45, 60

[0087] Prepared according to the method stipulated in the "Geotechnical Test Regulations", the sample diameter is 39.1mm, the height is 80mm, and it is saturated with water after vacuum pumping to make its saturation Sr> 95%. At a specific temperature (set 22°C, 45°C, 60°C), app...

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Abstract

The invention discloses a rock-soil body temperature-control dynamic characteristic test system and method, is characterized in that the system includes a dynamic triaxial pressure chamber and a temperature control device; the dynamic triaxial pressure chamber comprises a pressure chamber cylinder body, a piston rod and an upper dowel bar; a sample is arranged between the lower end of the upper dowel bar and the upper end of the piston rod; the dynamic triaxial pressure chamber also includes a pressure sensor, an axial displacement sensor, a deformation sensor, a confining pressure sensor, a lateral displacement sensor and a pore pressure sensor; the temperature control device includes a temperature sensor, a temperature controller and an arc plate type heater symmetrically coating the outer wall of the pressure chamber cylinder body. The temperature-control dynamic characteristic test method mainly includes installing the sample, setting the temperature control device, carrying out drainage consolidation of the sample, applying dynamic/static stress, and completing a temperature-control dynamic/static triaxial test, to determine the cumulative plastic strain, dynamic damping ratio, dynamic elastic modulus and other indexes of a rock-soil body under different temperatures. The system and the method have the advantages of uniform heating temperature, short heating time and low cost, and can accurately control the temperature in the pressure chamber.

Description

technical field [0001] The invention belongs to the technical field of soil engineering tests, and in particular relates to a test system and a test method for temperature-controlled dynamic characteristics of rock and soil. Background technique [0002] Earthquake force, wave force, explosive force, piling vibration, dynamic foundation force and traffic load in the construction process of railways, highways, ports and urban rail transit all belong to the category of dynamic loads, which affect the strength and deformation of foundation soil. It is very necessary to carry out the dynamic characteristic test of soil to obtain various dynamic characteristic parameters. The purpose of the soil dynamic characteristics test includes two aspects: one is to determine the dynamic strength of the soil, which is used to analyze the stability of the foundation and structures under large deformation conditions, especially the vibration liquefaction of sandy soil; the other is to determi...

Claims

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Application Information

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IPC IPC(8): G01N3/10G01N3/02
Inventor 刘干斌范思婷范高飞郭桢尹铁锋
Owner NINGBO UNIV
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