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常规的抗剪强度指标黏聚力c和内摩擦角φ无法准确描述堆载作用下任意固结度时软土的力学特性,而现有的考虑软土抗剪强度值随固结度增长的极限平衡法无法得出应力场、位移场等实际工程需要的数据,因此,基于理论推导和室内试验,对堆载作用下软土抗剪强度指标随固结度的变化规律进行了分析。对现有的2个计算公式进行了对比分析,得出它们具有等价性。从孔隙水压力的角度进行分析,提出了新的计算公式,并且得出内摩擦角随固结度单调递增,黏聚力随固结度单调递减的变化规律。当固结度一定且不为100%时,黏聚力与初始固结压力呈线性增长的关系,内摩擦角与其无关。室内试验表明,由于综合考虑了有效应力参数和总应力参数,新推导公式与试验结果吻合得更好,证明了新推导公式正确性和优越性。
Conventional shear strength index cohesion c and internal friction angle φ can not accurately describe the mechanical properties of soft clay with any degree of consolidation under surcharge. However, the existing consideration that the value of soft soil shear strength increases with the degree of consolidation The limit equilibrium method can not obtain the data needed by the actual engineering such as stress field and displacement field. Therefore, based on the theoretical derivation and laboratory tests, the change law of shear strength index of soft clay under consolidation with the degree of consolidation is analyzed. Comparing the two existing formulas, we find that they are equivalent. From the angle of pore water pressure, a new calculation formula is put forward, and the law of the internal friction angle monotonically increasing with the degree of consolidation is obtained. The variation of the cohesion decreases monotonically with the degree of consolidation. When the degree of consolidation is constant and not 100%, the relationship between cohesion and initial consolidation pressure increases linearly, and the internal friction angle has nothing to do with it. The indoor tests show that the newly derived formula is in good agreement with the experimental result due to the comprehensive consideration of the effective stress parameter and the total stress parameter, which proves the correctness and superiority of the new derivation formula.