Research on Moistening and Demoistening Behaviours of Collapsible Loess

2021 ◽  
pp. 261-266
Author(s):  
Zhang Sumin ◽  
Zhang Wei ◽  
Zheng Jianguo
Keyword(s):  
Collapsible Loess

scholarly journals Study on the Hydro-Thermal-Mechanical Characteristics of the Lime-Soil Compaction Pile in the Forming Process

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Fengchuan Zhang ◽  
Jianhua Dong ◽  
Xiaoyu Yang ◽  
Bo Lian ◽  
Xuelang Wang
Keyword(s):  
Soil Compaction ◽  
Pressure Change ◽  
Soil Pressure ◽  
Expansion Process ◽  
Forming Process ◽  
Collapsible Loess ◽  
Influence Of Water ◽  
Force Characteristics ◽  
Temperature Water ◽  
Pore Expansion

To study the effect of the lime-soil compaction pile on the collapsible loess foundation and the influence of water-heat-force characteristics on the soil during compaction, the field test of lime-soil compaction pile treatment of collapsible loess foundation is carried out. This paper monitors the process of soil temperature, water, and soil pressure change in the process of pile forming. According to the macroprocess and micromechanism of lime-soil compaction pile treatment of collapsible loess foundation, the qualitative law of water-heat-force change in the process of pile forming is obtained. Meanwhile, the influence of soil damage is introduced in the process of compaction expansion. The model of pore expansion under linear damage conditions in the plastic zone is established. The formula of radial stress distribution under damage conditions is given. The influence of different damage factors on the expansion process is analyzed.

scholarly journals Collapse Potential of Loess under Unloading Effect

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xin Jin ◽  
Tie-Hang Wang ◽  
Zai-Kun Zhao ◽  
Liang Zhang ◽  
Yan-Zhou Hao
Keyword(s):  
Low Cost ◽  
Initial Pressure ◽  
Threshold Value ◽  
Building Construction ◽  
Stress Variation ◽  
Collapse Potential ◽  
Evaluation Scheme ◽  
Practical Project ◽  
Collapsible Loess ◽  
Collapse Process

Collapsible loess is generally characterized by a sudden and substantial decrease in volume that occurs when is applied under constant stress. To evaluate the loess collapse potential, the self-weight collapse and collapse coefficients have been defined by the code for building construction in collapsible loess regions. However, the method in the code does not account for the vertical stress variation. The loess collapse process commonly occurs with stress variation in practice. This paper documents a low-cost, quantitative evaluation scheme using regression analysis to evaluate the loess collapse potential by varying the unloading levels. The results show that the factors that prominently account for loess collapse deformation are the initial pressure, unloading ratio, and collapse completed-ratio. At a constant collapse-completed ratio, the remnant collapse coefficient significantly decreases with the decreasing unloading ratio; at a constant unloading ratio, the remnant collapse coefficient increases with a decreasing collapse-completed ratio. Decreasing unloading and collapse-completed ratios decreased the loess collapse potential with an initial pressure that exceeds the threshold value. Finally, an unloading collapse deformation calculation of loess was prepared to analyze practical project problems of loess based on the unloading collapse test.

Thermal effects on water retention behaviour of unsaturated collapsible loess

2019 ◽  
Vol 20 (2) ◽  
pp. 756-762
Author(s):  
Qing Cheng ◽  
Chao Zhou ◽  
Charles Wang Wao Ng ◽  
Chaosheng Tang
Keyword(s):  
Thermal Effects ◽  
Water Retention ◽  
Retention Behaviour ◽  
Collapsible Loess ◽  
Water Retention Behaviour
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