Development of reasonable liquefaction strength estimation for cohesive sandy soils

本文提出用应力控制的循环直剪试验，以较低的造价估算粘性砂土等处理土的循环阻力比。对不同砂性土和粘土进行了循环剪切试验。所提出的试验所获得的CRR与常规的空心圆筒循环试验所获得的CRR具有较好的一致性。指出了实际应用中需要解决的问题，如合理确定双幅水平位移触发液化的判据等。

Stress-controlled cyclic direct shear test to simply estimate cyclic resistance ratio (CRR) of cohesive sandy soil such as treated soil by lower cost was proposed in this study. Cyclic shear tests for various sandy soils and clay were conducted. The CRR obtained by proposed test gave a good agreement with the CRR obtained by conventional cyclic test of hollow cylinder test. In addition, the problem to be solved for practice application such as a reasonable criteria decision of double amplitude horizontal displacement for triggering liquefaction was pointed out.