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采用干样沉降法制备样品 ,选用静三轴仪对松砂和密砂样在 10 k Pa至 10 0 k Pa的低围压下的排水行为进行了实验研究 ,并对实验结果作了橡皮膜校正 ,在围压为 10 k Pa的密砂实验中 ,轴向应力的校正值可达到 12 %。实验研究表明低围压下松砂的剪胀性非常明显 ,且存在剪应力极值 ;围压越低 ,松砂和密砂的剪应力极值越小 ,达到最大剪应力所对应的剪应变越小。同时还表明低围压范围内相对密度不同 ,砂的应力应变特性不同 ;此外 ,低围压下砂的内摩擦角高于高围压下的值 ,从而在工程上应重视低围压水平下砂土工程参数的合理选取
The dry sample sedimentation method was used to prepare samples. The static triaxial apparatus was used to study the drainage behavior of loose sand and sand samples under low confining pressure of 10 kPa to 100 kPa. The rubber membrane In the sand test with confining pressure of 10 kPa, the correction value of axial stress can reach 12%. Experimental studies show that the dilatancy of loose sand under low confining pressure is very obvious, and there is the extreme value of shear stress. The lower the confining pressure is, the smaller the extreme value of the shearing stress of loose sand and sand is and the larger the shear strain corresponding to the maximum shearing stress small. At the same time, it also shows that the relative density in the low confining pressure range is different, and the stress and strain characteristics of sand are different. In addition, the internal friction angle of sand under low confining pressure is higher than that under high confining pressure, so the low confining pressure should be emphasized Reasonable Selection of Sand Engineering Parameters