Basal stability of braced excavations in K0-consolidated soft clay by upper bound method

Q3 Earth and Planetary Sciences
Qin Hui-lai
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引用次数: 5

Abstract

The design of braced excavations in soft clays is usually controlled by the short-term undrained stability.The principal stress axial rotation induced by excavation and the undrained anisotropic soil strength were taken into consideration.Assuming the Prandtl soil slip failure modes and considering the anisotropic soil strength recommended by Casagrande and Carillo and the non-homogeneous feature of soft soil,a calculation method for evaluating the basal stability was proposed based on the upper bound analysis.It was indicated by the numerical results that the basal stability was significantly influenced by the anisotropy ratio of soil,the plane geometry of the excavation as well as the thickness of soft soil layer between excavation base and hard stratum.The results were also compared with those calculated by numerical methods.The present method was verified by the field observations of braced excavations.
用上限法研究k0固结软粘土中支护基坑的基底稳定性
软粘土中支撑开挖的设计通常由短期不排水稳定性控制。考虑了开挖引起的主应力轴向旋转和不排水各向异性土体强度。假设Prandtl土体滑移破坏模式,考虑Casagrande和Carillo推荐的土体强度各向异性以及软土的非均质性,提出了基于上界分析的地基稳定性评价计算方法。数值结果表明,基坑稳定性受土体各向异性比、基坑平面几何形状以及基坑基底与硬地层之间软土层厚度的显著影响。并与数值计算结果进行了比较。该方法已通过基坑支护的现场观测得到验证。
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来源期刊
岩土工程学报
岩土工程学报 Earth and Planetary Sciences-Geotechnical Engineering and Engineering Geology
CiteScore
2.50
自引率
0.00%
发文量
11264
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