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由于结构性的存在使得很多天然黏性土的强度和变形特性不同于重塑土和非结构性土。首先回顾了适用于确定重塑土和非结构性土不排水抗剪强度的有效固结应力法,并推导了相应的方程。在此基础上,对于结构性黏性土,采用两段不同斜率(内摩擦角正切)和截距(黏聚力)的直线模拟其抗剪强度包络线,建立了确定其不排水抗剪强度的有效固结应力法方程;当有效应力小于结构屈服应力时,有效固结应力方程中有效应力部分需乘以0.8的修正系数;只要已知剪切前的有效应力,利用相应的有效固结应力法公式,可确定结构性土体的不排水抗剪强度。利用连云港结构性软黏土的等压固结三轴试验数据,验证了有效固结应力法的适用性。分析表明:对于连云港软黏土的不排水抗剪强度,有效固结应力法的计算结果与试验结果吻合较好;对于结构屈服应力,有效固结应力法的预测结果与试验数据点的拟合结果有一定偏差,但并不明显。
The structural and physical properties of many natural clayey soils differ from those of remodeled and unstructured soils. Firstly, the effective consolidation stress method, which is suitable for determining undrained shear strength of remolded and non-structured soil, is reviewed and the corresponding equations are deduced. On this basis, for the structural clay, the envelope of shear strength was simulated by two straight lines with different slopes (internal friction tangent) and intercept (cohesion) When the effective stress is less than the structural yield stress, the effective stress component in the effective consolidation stress equation needs to be multiplied by the correction factor of 0.8. As long as the effective stress before shear is known, the effective effective stress Knot stress law formula, can determine the undrained shear strength of structural soil. Based on the isostatical consolidation triaxial test data of Lianyungang structural soft clay, the applicability of the effective consolidation stress method is verified. The analysis shows that for the undrained shear strength of soft clay in Lianyungang, the calculated result of effective consolidation stress method is in good agreement with the test result. For the structure yield stress, the fitting result between the predicted value of the effective consolidation stress method and the experimental data point A certain deviation, but not obvious.