高应力下石英砂与不同结构接触面抗剪强度的试验研究

高应力下土与结构接触面抗剪强度研究是当前井壁破裂理论研究的关键之一 .通过在DRS 1型微机高压直残剪试验系统上所进行的标准石英砂与不同基底的界面剪切特性试验研究表明 ,高应力作用下不同结构接触面的峰值强度与正应力以及残余强度与正应力之间的关系符合库仑强度准则 .咬合强度C和界面摩擦角δ取决于基底材料的刚度 ,刚度越大 ,C值越小 ,δ值越大 .高应力作用下不同结构界面剪切过程中土体都呈现出剪缩性 ,体积应变随剪切位移的增大而增大 ,体积应变受接触面的刚度和正应力共同影响

Experimental study of shear strength between siliceous sand and structure interfaces in high stress

The shear strength between soil and structure interfaces in high stress is one of key research in shaft lining fracture theory. The experiments of shear character between siliceous sand and structure interfaces in high stress is carried out in DRS?1 computer direct shear and cyclic shear apparatus. The results showed that the relationships of peak strength versus normal stress and residual strength versus accorded with Coulomb′s law, interlocking strength C and angel of internal friction δ depended on base rigidity, the larger the base rigidity and the smaller the C and the larger the δ. The soil under different structure interfaces in high stress presented contraction throughout, volumetric strains increased with increasing shear displacement, and base rigidity and normal stress have effect on the volumetric strain.