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首页> 外文会议>Pan-American conference on unsaturated soils >Analysis and Performance Monitoring of a Temporary Excavation in Highly Plastic Clay and Comparison of Predicted and In-Situ Soil Strength Due to Unsaturated Soils
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Analysis and Performance Monitoring of a Temporary Excavation in Highly Plastic Clay and Comparison of Predicted and In-Situ Soil Strength Due to Unsaturated Soils

机译：高塑性黏土临时开挖的分析和性能监测以及非饱和土引起的预测和现场土强度的比较

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A temporary excavation required to construct a new lift station was designed for a 32 ft maximum height at 3H to 2V with multiple benches. As a result of the design analysis, the calculated FOS for the effective stress and fully softened conditions did not meet the minimum required. Given the uncertainty in the degree of saturation, pore pressure dissipation, and seasonal wet/dry cycles, our firm required performance monitoring to evaluate the stability of the excavation during the 6-8 week construction period. The excavation was backfilled after 8 weeks without observable global failure distress features. This performance likely was because the clayey soils were not fully saturated and therefore the in-situ shear strength of the soils was higher than estimated due to negative pore pressure. The authors completed an as-built analysis which is presented here; the in-situ apparent shear strength of the soils was back-calculated to evaluate the quantitative contribution of the unsaturated soil effects.
机译：建造一个新的升降机站所需的临时开挖设计为在3H至2V下具有32英尺的最大高度，并带有多个工作台。作为设计分析的结果，对于有效应力和完全软化的条件，计算出的FOS没有达到要求的最小值。考虑到饱和度，孔隙压力消散和季节性干/湿循环的不确定性，我们公司需要进行性能监测，以评估6-8周施工期开挖的稳定性。开挖8周后回填，但没有可观察到的整体破坏遇险特征。该性能可能是因为粘土土壤没有完全饱和，因此由于负孔隙压力，土壤的原位抗剪强度比估计的要高。作者完成了这里的竣工分析。反算土壤的表观剪切强度，以评估非饱和土效应的定量贡献。

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