Comprehensive test equipment for observing permeation and settlement of accumulated gravel soil

Abstract

The invention discloses comprehensive test equipment for observing permeation and settlement of accumulated gravel soil. The test equipment comprises a permeation and settlement integrated generation observation system and a constant pressure circulating water supply system. The equipment disclosed by the invention has the following technical effects that 1, artificial rainfall is simulated, and the moisture infiltration condition of unsaturated gravel soil under different rainfall intensities is directly observed; 2, the settlement deformation of the soil body in a natural state and under the simulated rainfall condition can be measured; 3, because the equipment is large in overall size, the grading features of the natural soil can be remained to the greatest degree, and a size effect is weakened; and 4, the equipment is accurate in testing, easy to operate and economical in construction cost, the overall structure is subjected to modular combination, and function extension is conveniently realized.

Description

technical field [0001] The invention relates to a comprehensive test equipment for observing seepage settlement. Background technique [0002] At present, the instrument commonly used indoors to measure the permeability coefficient of soil and rock bodies in China is the TST-70 type permeameter. Geotechnical Test Regulations People's Republic of China Industry Standard Compilation Group. SL237-1999 Geotechnical Test Regulations [S]. Beijing: China Water Conservancy and Hydropower Press, 1999. It stipulates that in order to reduce the size effect, the inner diameter of the cylinder permeameter should be larger than the largest particle size of the sample. 10 times the diameter. Qiu Xiande et al. Qiu Xiande, Yan Zongling, Liu Li, et al. Effect of particle size characteristics of rockfill body on its permeability. [J]. Rock and Soil Mechanics, 2004, 25(6): 950-954. Requirements for simulated samples The diameter should not be less than 5 to 6 times the maximum diameter of the...

AI Technical Summary

Problems solved by technology

Since the maximum particle size of accumulated gravel soil is generally 60mm-80mm, while the TST-70 permeameter water cylinder is only 100mm×400mm, its size is small, and the size effect is significant, which makes it impossible to objectively and accurately reflect the infiltration of debris flow soil and rock bodies coefficient

If a three-axis permeameter is used for measurement, it is not suitable for promotion due to its high cost, complicated operation, and high requirements for operators.

In addition, the above-mentioned measuring instruments are mainly metal cylinders with a single structure and function. They can only test the saturated permeability coefficient of the soil through the water supply of the Martens bottle, and cannot simulate artificial rainfall and observe the moisture content of unsaturated gravel soil under different rain intensities. Infiltration process, and it is impossible to measure the settlement and deformation of soil and rock during rainwater infiltration

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