Rock and earth mass frost heaving parameter in-situ tester
A tester and technology of rock and soil mass, which are applied in the field of in-situ testing of geotechnical engineering in cold regions, and can solve the problems of inability to accurately simulate the stress state and groundwater conditions on site, damage to the original structure and state of rock and soil mass, and limited test accuracy. , to solve the problem of freezing damage of underground engineering in cold regions, solve the problem of hysteresis, and achieve the effect of short test period
Active Publication Date: 2015-12-23
SOUTHEAST UNIV
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Problems solved by technology
Indoor frost heaving experiments have the advantages of quickness, convenience, and low test cost. However, the preparation of indoor test samples destroys the original structure and state of rock and soil, and cannot accurately simulate the stress state and groundwater conditions on site. The rock mass obtained from indoor experiments Frost heave parameters cannot faithfully reflect the frost heave characteristics of rock and soil, and its test accuracy is limited; on-site frost heave force monitoring is to monitor the frost heave force of surrounding rock by embedding pressure sensors between the surrounding rock and the underground structure. Obtain the frost heaving force of the rock mass, but this method needs to embed the sensor in the construction process of the underground structure, the obtained results can only be used to test the rationality of the design calculation, and cannot be used for the design calculation, there is hysteresis, and there is also a long monitoring period , high monitoring cost and other disadvantages
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[0029] The in-situ testing instrument for frost heaving parameters of rock and soil mass in this embodiment is as follows: figure 1 As shown, it includes a pressure control device 1 arranged outside the borehole 5, a liquid nitrogen bottle 2, a temperature control device 3 and a data acquisition device 4, and a test probe 6 arranged in the borehole 5, through a pressure pipeline 7, heat preservation Pipeline 8 and wire 9 connect the two. Among them, the temperature control device 3 provides a cold source for freezing the rock and soil around the borehole, and is connected to the test probe 6 through the insulation pipeline 8; the pressure control device 1 provides the pressure required for the expansion of the elastic airbag, and is connected through the pressure pipeline to test probe 6. The data collection device 4 is used to collect the monitoring data of each sensor, and is connected to each sensor on the test probe 6 through a wire 9 .
[0030] like figure 2 and ima...
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Abstract
The invention discloses a rock and earth mass frost heaving parameter in-situ tester. The tester comprises a test probe, a control device and a data collection device. The test probe comprises a hollow shaft, an elastic air bag, a thermal insulation layer, a heat exchange sheet and a protection sleeve which are distributed in order from inside to outside. The upper end and the lower end of the elastic air bag are fixed on the hollow shaft through flanges. A frost heaving force monitoring device and a frost heaving displacement monitoring device are arranged between the hollow shaft and the air bag. The control device comprises a temperature control device and a pressure control device. The temperature control device is connected with the heat exchange sheet through a thermal insulation pipe. The pressure control device is connected with the elastic air bag through a pressure pipe. The data collection device is connected with a sensor arranged on the test probe. The tester has advantages of accurate result, low cost, easy operation and the like.
Description
technical field [0001] The invention relates to the field of in-situ testing of geotechnical engineering in cold regions, in particular to a testing instrument capable of measuring frost heaving parameters of rock and soil bodies. Background technique [0002] The frost heaving parameters of rock and soil include the frost heaving rate and frost heaving force of rock and soil. Accurate acquisition of the frost heaving parameters of rock and soil is a prerequisite for the rationality of the design and calculation of underground engineering structures in cold regions. The test of rock mass frost heaving parameters is mainly There are indoor frost heave experiments and on-site frost heave force monitoring. Indoor frost heaving experiments have the advantages of quickness, convenience, and low test cost. However, the preparation of indoor test samples destroys the original structure and state of rock and soil, and cannot accurately simulate the stress state and groundwater condi...
Claims
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IPC IPC(8): G01N25/14
Inventor 张国柱刘松玉
Owner SOUTHEAST UNIV
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