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为研究盾构隧道施工对周边土层的扰动情况,对施工现场原状土进行了6种不同应力路径的试验.该原状土屈服面存在明显的各向异性.采用解析法对不同荷载环境下盾构施工扰动塑性区的分布规律进行了研究.结果表明:原状土在不同应力路径下的力学特性明显不同,被动压缩路径下土体强度大于主动压缩路径下土体强度,加载应力路径下土体强度大于卸载应力路径下土体强度,而压缩应力路径下土体强度远大于拉伸应力路径下土体强度.隧道邻近区域环境荷载的大小和位置是影响盾构隧道施工塑性区分布形状和范围的重要因素.
In order to study the disturbances of the surrounding soil by shield tunneling, six different stress paths were tested on undisturbed soil at the construction site.The apparent anisotropy of the undisturbed soil yield surface was analyzed.Analytical method was used to analyze the shields under different loading conditions The results show that the mechanical properties of undisturbed soil under different stress paths are obviously different, the strength of soil under passive compression path is greater than the strength of soil under active compression path, the soil under loading stress path And the strength of soil under compression stress path is much larger than that of soil under tensile stress path.The size and position of environmental load in the adjacent area of tunnel is the shape and scope of the distribution of plastic zone in the construction of shield tunnel The important factor.