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结合上海某植物园堆山工程,通过直剪试验及三轴剪切试验,得到考虑软土结构性的折线型强度公式和不考虑软土结构性的直线型强度公式的参数,采用这两种方法对山体荷载作用下不同位置处的软土地基的强度增长进行了预测,并与现场十字板剪切试验结果进行了对比。结果表明:由于该工程的软土地基具有明显的结构性,采用直线型强度公式得到的地基强度增长量要大于采用采用折线型的增长量;另外,在应用考虑土的结构性的折线型强度公式时,应该尽量采用三轴试验参数而不是直剪试验的参数,这样得到的结果更接近十字板试验结果。
Combined with the pile-climbing project of a botanical garden in Shanghai, the parameters of the fold-line type strength formula considering soft-soil structure and the linear-type intensity formula without considering the soft-soil structure are obtained by both the direct shear test and the triaxial shear test. The strength growth of soft ground under different mountain loads was predicted and compared with the results of on-site shear test. The results show that due to the obvious structural nature of the soft soil foundation of the project, the increase of strength of the foundation obtained by the straight-line strength formula is larger than that of the adoption of the fold-line type. In addition, in the application, the structural linear fracture strength Formula should try to use the three-axis test parameters rather than the parameters of the direct shear test, the result is closer to the cross plate test results.