固结后软黏土不排水抗剪强度简化计算方法比较

发布时间：2018-06-16 00:36

本文选题：软黏土 + 不排水抗剪强度　；参考：《土木工程学报》2014年10期

【摘要】：由于剪切破坏时的孔压难于确定,软黏土的稳定分析常采用不排水强度分析法。文中简要回顾计算软黏土不排水抗剪强度的Mesri法、Ladd法和有效固结应力法,推导相应的计算不排水抗剪强度全量和固结后增长量的简化公式。结合杜湖水库土坝和东海塘海堤试验段两个工程实例,分别用3种简化方法计算了不同加载和固结阶段地基土的抗剪强度,并与现场十字板强度进行对比。分析表明:对于固结后不排水抗剪强度的增量,有效固结应力法、Mesri法和Ladd法的计算值与实测值均较为吻合;由于有效固结应力法计算的抗剪强度增长值普遍略高于实测值,文中建议了相应的修正公式;用有效应力法计算土体固结后的强度增量结果明显大于实测结果。
[Abstract]:Due to the difficulty of determining pore pressure in shear failure, undrained strength analysis is often used to analyze the stability of soft clay. In this paper, the Mesri method and the effective consolidation stress method for calculating the undrained shear strength of soft clay are briefly reviewed, and the corresponding simplified formulas for calculating the total undrained shear strength and the growth amount after consolidation are derived. Combined with two engineering examples of the earth dam of Duhu Reservoir and the test section of Donghai Tong seawall, three simplified methods were used to calculate the shear strength of foundation soil in different loading and consolidation stages, and the results were compared with the strength of cross plate in the field. The analysis shows that the calculated values of the effective consolidation stress method Mesri method and the Ladd method are in good agreement with the measured values for the increment of undrained shear strength after consolidation, because the increase value of shear strength calculated by the effective consolidation stress method is generally slightly higher than the measured value. The corresponding modified formula is suggested, and the strength increment after consolidation is calculated by the effective stress method, which is obviously larger than that of the measured one.
【作者单位】：浙江科技学院;
【基金】：国家自然科学基金(40406019) 浙江省公益技术应用研究项目(2014C33037)
【分类号】：TU43

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