滑动测微管抗渗能力的测试装置及试验研究

doi:10.16285/j.rsm.2019.1500

Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (7): 2504-2515.doi: 10.16285/j.rsm.2019.1500

• Testing Technology • Previous Articles

Testing device and experimental study on anti-seepage ability of sliding micrometer tube

LIU Zheng-hong^{1, 2, 3}, ZHANG Long^{2, 3}, ZHENG Jian-guo^{2, 3}, ZHANG Wei^{2, 3}, YU Yong-tang^{2, 3}

1. College of Geological Engineering and Geomatics, Chang’an University, Xi’an, Shaanxi 710054, China; 2. China JK Institute of Engineering Investigation and Design Co. Ltd., Xi’an, Shaanxi 710043, China; 3. Shaanxi Key Laboratory for the Property and Treatment of Special Soil and Rock, Xi’an, Shaanxi 710043, China

Received:2019-09-02 Revised:2019-12-16 Online:2020-07-10 Published:2020-09-20
Supported by:
This work was supported by the Science and Technology Overall Innovation Project of Shaanxi Province (2016KTZDSF04-05-01), the Transformation and Guidance of Major Scientific and Technological Achievements Project of Shaanxi Province (2015KTCG01-08) and the Science and Technology R & D Fund Project of China Mechanical Engineering Corporation (CMEC-KJYF-2016-06).

Abstract

Abstract: It is a way to measure the internal force of pile foundation by sliding micrometer, and the anti-seepage measures during the installation of sliding micrometer tube are the key to achieve high quality test, while quantitative research on anti-seepage effect of measures is rare. A set of device for testing the anti-seepage ability of sliding micrometer tube was developed. The seepage flow of three common anti-seepage measures under different pressure differences was tested, and a formula for calculating the seepage flow was developed. The matters needing attention in the installation of the sliding micrometer tube were analyzed according to the site conditions. Test results show that when the internal pressure is higher than the external pressure, the seepage flow rate is much larger than that when the external pressure is larger than the internal pressure. Glue coating is a very effective anti-seepage measure, and generally no particles with a diameter over 0.005 mm will enter the sliding micrometer tube after adopting this measure. Increasing the water head in the sliding micrometer tube is beneficial to reduce impurities entering it, but the water head in the sliding micrometer tube can not be too much higher than the liquid levels in the borehole of the pile. After pouring concrete, if water overflow in the sliding micrometer tube happens, the orifice of the sliding micrometer tube should be closed to limit water overflow, and if the water level in the sliding micrometer tube falls, the orifice of the sliding micrometer tube should be opened to allow gas to enter it.

Key words: sliding micrometer, pile, stress test, anti-seepage measure

CLC Number:

TU 473.1

LIU Zheng-hong, ZHANG Long, ZHENG Jian-guo, ZHANG Wei, YU Yong-tang, . Testing device and experimental study on anti-seepage ability of sliding micrometer tube[J].Rock and Soil Mechanics, 2020, 41(7): 2504-2515.

References

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