桩间黄土卸荷湿陷过程中卸荷量计算方法初探

doi:10.16285/j.rsm.2021.1904

Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (9): 2399-2409.doi: 10.16285/j.rsm.2021.1904

• Fundamental Theroy and Experimental Research • Previous Articles Next Articles

Preliminary study of unloading calculation method in the unloading collapse process of loess between piles

JIN Xin¹, WANG Tie-hang², HAO Yan-zhou³, ZHAO Zai-kun ², ZHANG Liang², ZHANG Meng¹

1. School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an, Shaanxi 710021, China; 2. College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710021, China; 3. School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan, Henan 467036, China

Received:2021-11-10 Revised:2022-05-06 Online:2022-09-12 Published:2022-09-12
Supported by:
This work was supported by the Natural Science Program of Shaanxi Science and Technology Department (2021JQ-644) and the Scientific Research Program of Shaanxi Education Department(21JK0672, 21JK0689).

Abstract

Abstract: To investigate the proper value of unloading in the unloading collapse process of loess between piles, a correlation between pile-soil interface shear strength, shear displacement, and pile-soil interface normal force under collapse was studied by interface shear test. In the range of neutral points, the results indicate that the shear strength of the pile-soil interface under different vertical stresses and water contents can represent the pile side negative friction resistance. Using the mechanical principle of the mutual action and reaction force between the unloading amount and the negative frictional resistance, we proposed a method to calculate the unloading amount based on the unloading variation laws during loess collapse. The rationality of proposed method is verified via the comparison between the calculated unloading values and the field measured results of pile side negative friction resistance in different loess areas. This method provides a quantitative means of unloading effect to promote loess unloading collapse evaluation and optimize the relevant loess engineering design theory.

Key words: unloading collapse, collapsible loess, collapse potential, collapse process

CLC Number:

TU411

JIN Xin, WANG Tie-hang, HAO Yan-zhou, ZHAO Zai-kun, ZHANG Liang, ZHANG Meng, . Preliminary study of unloading calculation method in the unloading collapse process of loess between piles[J].Rock and Soil Mechanics, 2022, 43(9): 2399-2409.

References

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