Design of borehole in-situ shear test system

LIU Xin; LAN Heng-xing; YAN Chang-gen; DONG Zhong-hong; BAO Han; WU Yu-ming; ZHANG Fan-yu; ZHU Yan-bo; ZHANG Jun

doi:10.19818/j.cnki.1671-1637.2023.04.011

Volume 23 Issue 4

Aug. 2023

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Article Navigation > Journal of Traffic and Transportation Engineering > 2023 > 23(4): 154-164

LIU Xin, LAN Heng-xing, YAN Chang-gen, DONG Zhong-hong, BAO Han, WU Yu-ming, ZHANG Fan-yu, ZHU Yan-bo, ZHANG Jun. Design of borehole in-situ shear test system[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 154-164. doi: 10.19818/j.cnki.1671-1637.2023.04.011

Citation:

LIU Xin, LAN Heng-xing, YAN Chang-gen, DONG Zhong-hong, BAO Han, WU Yu-ming, ZHANG Fan-yu, ZHU Yan-bo, ZHANG Jun. Design of borehole in-situ shear test system[J]. Journal of Traffic and Transportation Engineering, 2023, 23(4): 154-164. doi: 10.19818/j.cnki.1671-1637.2023.04.011

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Design of borehole in-situ shear test system

doi: 10.19818/j.cnki.1671-1637.2023.04.011

1.
School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710064, Shaanxi, China
2.
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
3.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
4.
School of Construction Machinery, Chang'an University, Xi'an 710064, Shaanxi, China
5.
College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, Gansu, China
6.
National Engineering Research Center of Highway Maintenance Equipment, Chang'an University, Xi'an 710064, Shaanxi, China

Funds:

National Natural Science Foundation of China 41927806

More Information

Author Bio:
LIU Xin(1987-), male, associated professor, PhD, xliu67@chd.edu.cn

LAN Heng-xing(1972-), male, professor, PhD, lanhx@igsnrr.ac.cn
Received Date: 2023-03-06
Available Online: 2023-09-08
Publish Date: 2023-08-25

Abstract

Abstract

In order to solve the problems of shallow detection depth and over-reliance on empirical formulas in the traditional in-situ soil strength test, a borehole in-situ shear test system was proposed, and a prototype was developed. The whole test system consisted of an in-hole cutting subsystem, which could anchor and cut the soil ring at any position in the borehole, and an in-hole shear subsystem with a reducing wing, which could perform shear tests on the soil ring and record shear force and shear displacement through sensors. Based on the borehole shear test in the model box and the direct shear test in the laboratory, the reliability of the borehole in-situ shear test system was verified. Research results show that the shear plane of the borehole shear test in the model box is parallel to the direction of the shear force, and the stress-strain curve is found to be consistent with the expectation. The strain softening behavior occurs for loess in the borehole shear test in the model box and direct shear test in the laboratory, and the peak shear strength of the loess decreases with the increase in water content. The brittle failure is found in the direct shear test in the laboratory, while in the borehole shear test, the loess shows plastic failure. The peak strength is higher in the borehole shear test than in the direct shear test in the laboratory under the same void ratio, water content, and loading pressure. The above discrepancy is attributed to the fact that the stress distribution along the shear plane is not uniform in the direct shear test in the laboratory, while in the borehole in-situ shear test, the stress on the shear plane is stable and remains unchanged. Compared with the direct shear test in the laboratory, the borehole in-situ shear test system exhibits a higher test accuracy.
- geotechnical engineering,
- shear strength,
- laboratory direct shear test,
- borehole in-situ shear,
- geological disaster

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References

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Design of borehole in-situ shear test system

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