Abstract

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Title:: Reinforcement Mechanism of Cement Slurry Grouting in Collapsible Loess

Author(s):: ZHOU Ming-ru; CHEN Zhi-chao; LUO Xiao-bo; ZHOU Guang-kang; LU Cheng-gong; Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology

Keywords:: collapsible loess; mechanical property; reinforcement mechanism; grouting; cement slurry; separation

Abstract:: By analyzing the structure composition, collapsibility mechanism and mechanical properties of collapsible loess, the deformation and failure mechanism of collapsible loess under external loads were studied. The in-situ cement slurry grouting reinforcement test was carried out in collapsible loess, and the interaction during grouting processes at different time was analyzed. The consolidation mechanism of cement slurry in collapsible loess was studied by analyzing the texture and deformation of soil after grouting. The interaction between cement slurry and soil during grouting was studied by means of elastic mechanics and fracture mechanics. The results show that cement slurry grouting can effectively reinforce collapsible loess. During the grouting process of collapsible loess, the collapsibility of slurry is very small, and the collapsibility can be compensated quickly under the action of pressure. The reinforcement mechanism of cement slurry in loess includes filling grouting, splitting grouting and compaction grouting, and controlling grouting pressure can effectively realize compaction and splitting grouting in collapsible loess.