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天津港区地基土上覆较厚的软黏土层,处于欠固结状态,含水率高,承载力低。在构筑物施工期稳定性分析中,需要采用不排水强度指标。常用的几种抗剪强度指标中,以十字板强度最为可靠。但由于十字板强度是土体各滑动面上的抗剪强度的较小值,用于计算土坡稳定性计算常得出过于保守的不合理的结果。同时,单一的十字板强度指标无法用于计算箱筒型基础的地基土压力及承载力。基于十字板强度随深度线性分布的规律及莫尔–库仑抗剪强度原理,结合收集的大量的十字板强度实测数据,通过回归统计分析推算出地基土的两个抗剪强度指标,并将其应用于软黏土土坡的稳定分析及新型箱筒型基础稳定性的计算,计算结果较为合理。
The soft clay layer overlying thick foundation soil in Tianjin Port Area is in an underconsolidated state with high water content and low bearing capacity. In the construction stability analysis of structures, it is necessary to adopt the index of undrained strength. Several commonly used indicators of shear strength, the strength of the cross plate is the most reliable. However, since the strength of the cross plate is a relatively small value of the shear strength of each sliding surface of the soil, the calculation of the stability of the slope often leads to overly conservative and unreasonable results. At the same time, a single cross-plate strength index can not be used to calculate the pressure and the bearing capacity of foundation soil for box-type foundation. Based on the law of the strength distribution of the cross-deck with depth and the Mohr-Coulomb shear strength principle, combining with the collected data of the strength of the cross-plate, the two shear strength indexes of the foundation soil are calculated by regression statistical analysis, Applied to the stability analysis of soft soil slope and the calculation of the stability of a new box-type foundation, the calculation result is more reasonable.