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依托无锡地铁1号线盾构区间开挖工程,根据盾构施工周边不同区域内土体扰动的特点,对盾构施工现场原状土进行一系列应力路径室内三轴试验。试验结果表明:不同的应力路径下土体强度和变形特征显著不同,等比压缩、被动压缩、等p压缩和主动压缩的强度依次递减;土体在卸载应力路径下的强度和破坏时的轴向应变小于加载应力路径时的相应值;而土样在压缩应力路径下的强度要远远大于伸长应力路径下的强度。
Relying on the excavation project of shield tunnel in Wuxi Metro Line 1, according to the characteristics of soil disturbance in different areas around shield construction, a series of stress triaxial tests of the stress path were carried out on the undisturbed soil of shield construction site. The experimental results show that the strength and deformation characteristics of soil under different stress paths are significantly different. The ratios of isostatic compression to compression and compression decrease gradually. The strength of soil under unloading stress path and the failure axis The strain is less than the corresponding value when loading the stress path; while the strength of the soil specimen in the compressive stress path is far greater than that under the stress path.