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扰动后土体强度和变形特性的研究非常重要,针对工程活动扰动及人为扰动多采用室内试验进行模拟,结果往往不具有可重复性,常规原位测试手段,仅能获得扰动土体强度变化,不能获得应力应变关系变化。以旁压试验方法研究土体扰动前后的强度和变形指标变化,对上海第(4)、(5)、(6)层粘性土在扰动前后分别进行旁压试验,研究不同土层扰动前后的强度和变形规律。从扰动前后的旁压试验对比发现,扰动后土体的强度有明显变化,初始压力、临塑压力以及旁压模量等均有明显下降,扰动对土体的变形规律也有较大影响,旁压试验弹塑性阶段的旁压曲线在扰动前后差别明显,极限体应变也产生明显下降。
It is very important to study the strength and deformation characteristics of the soil after disturbance. Many indoor tests are used to simulate the disturbance of engineering activities and man-made disturbances. The results often do not have the repeatability and conventional in situ testing methods, Can not get the change of stress-strain relationship. The pressure and the deformation index before and after soil disturbance were studied by the pressure-side pressure test. The pressure-bearing tests were conducted on the cohesive soils before and after disturbance in Shanghai (4), (5) and (6) Strength and deformation laws. From the comparison of the pressure test before and after the disturbance, it is found that the strength of the soil after the disturbance has obviously changed, the initial pressure, the plastic pressure and the side pressure modulus have obviously decreased. The disturbance also has a great influence on the deformation law of the soil. Compression test elastic-plastic phase of the pressure curve before and after the disturbance significantly different, the ultimate body strain also decreased significantly.