Development of reasonable liquefaction strength estimation for cohesive sandy soils

采用应力控制循环直剪试验，以较低的成本简单估算处理过的粘性砂质土的循环阻力比。对各种砂质土和粘土进行了循环剪切试验。所提出的试验结果与常规空心汽缸循环试验结果吻合较好。并指出了在实际应用中需要解决的双幅水平位移触发液化的合理判据确定等问题。

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.