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饱和砂和低塑性粘土的临界剪应变γcr的研究为循环应变法分析该类土的液化势提供了依据。文中介绍了用共振柱仪测定γcr的试验研究结论,指出γcr受土的密度、固结压力和超固结比的影响较小,试验结果比较稳定。建议对正常固结的饱和砂、浅埋松散粉砂、浅埋低塑性粘土的γcr分别取为(1～2)×10~(-4)、(1.5～1.8)×10~(-4)、(2.6～3.0)×10~(-4)。文中还给出了用循环应变法分析土层液化势的公式和方法,并通过计算实例说明了γcr对土层液化势的敏感性影响很大,因此,务必精确测定之。
The study of the critical shear strain γcr of saturated sand and low plastic clay provides a basis for the analysis of the liquefaction potential of this type of soil by cyclic strain method. In this paper, the experimental results of the determination of γcr using a resonant column instrument are introduced. It is pointed out that the density, consolidation pressure and overconsolidation ratio of γcr soil have little effect, and the test results are relatively stable. It is suggested that the γcr for normally consolidated saturated sand, shallow buried silt, and shallow-buried low plastic clay be taken as (1～2)×10~(-4), (1.5～1.8)×10~(-4), respectively. (2.6 to 3.0) × 10 to (-4). The equations and methods for analyzing the liquefaction potential of soil by cyclic strain method are also given in this paper. The calculation examples show that γcr has a great influence on the liquefaction potential of soil. Therefore, it must be determined accurately.