Experimental study on permeability of clay during coupled compression and shear
WEI Xing1，ZOU Ting1，WANG Gang2
(1. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. School of Civil Engineering，Chongqing University，Chongqing 400045，China)
A series of seepage tests under coupled compression and shear were performed on a typical clay by a newly-invented hollow cylinder apparatus. The permeability characteristics of the clay before，during and after large shear deformation were studied comparably. It was found that the magnitude of current consolidation stress controls the changing of the permeability coefficient and seepage stability of the clay during shearing. When the exerted vertical stress is greater than the preconsolidation stress of the specimen，the shear plane is compacted during shearing，no concentrated leakage is found in the specimen，and the overall permeability coefficient decreases slightly after shearing. In contrast，when the exerted stress is less than the preconsolidation stress of the specimen，the shear plane dilates and opens gradually during shearing，and then becomes a channel of concentrated leaking. Although the open shear plane can heal itself during steady seepage，its permeability coefficient after healing increases remarkably. For the normal consolidated specimen，the seepage stability have no significant change. For overconsolidated specimen，the seepage stability decreases significantly，and the pattern of seepage failure is hydraulic fracture and crack scouring when raising the water head rapidly.
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2017, Vol. 36 
