梧州防洪堤堤基的抗剪强度参数分析

Levee foundation shear strength parameter analysis of Wuzhou flood dike

对梧州防洪堤堤基土进行了室内直接剪切试验、残余剪、三轴剪切试验、原位剪切试验及计算机模拟试验,通过对滑动带土体及非滑带土体进行计算,证明了原位直接剪切试验结果与实际边坡状态相符。当原位试验方法难以实施时,三轴试验是可靠性较高的试验,结果有利于工程安全。在缺乏原位试验与三轴试验数据时,直接剪切试验与室内直剪残余剪试验结果应适当降低,降低的程度与土质条件等工程状态相关。

Indoor direct shear test, residual shear test, tri-axial shear test, in-situ shear test and computer simulation test had been conducted for the levee foundation soil of Wuzhou flood dike. The achievements of calculation conducted for soil mass in slide zone and non-slide zone demonstrate that in-situ direct shear test show results in conformity with actual slope state. If it is difficult to carry out in-situ test, tri-axial test is a method with relatively high reliability and favorable for engineering safety. When there is no data of in-situ test or tri-axial test, the values of direct shear test and indoor direct residual shear test shall be decreased to an extent related to the engineering state such as soil conditions.