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采用极限分析上限法,建立土质边坡坡面沉桩动态稳定性三维计算模型,研究沉桩力、桩土间横向力等对边坡动态稳定性的影响。通过算例计算,对整个沉桩过程中边坡抗滑稳定安全系数的变化规律及其内在机制进行深入研究,并分析桩径、沉桩位置、坡角对边坡抗滑稳定安全系数的影响规律。结果表明:沉桩力对边坡稳定性产生不利影响,导致沉桩前期边坡安全系数持续降低;桩体穿过破坏面后,边坡安全系数由于桩身的抗滑作用而显著提高。桩径越大,沉桩前期安全系数越低,其下降速度也越快,但桩体穿过破坏面后安全系数提升也越明显;沉桩位置越靠近坡顶,沉桩过程中安全系数下降速度越快,导致最危险点的安全系数越低;坡角越大,沉桩过程中整体安全系数越低。分析结果对于坡面沉桩的稳定性评估及设计施工具有一定参考价值。
By using the upper bound method of limit analysis, a three-dimensional calculation model of dynamic settlement of soil slope on soil slope is established, and the influence of pile driving force and transverse force between pile and soil on dynamic stability of slope is studied. Through the example calculation, the variation regularity and intrinsic mechanism of safety factor of slope anti-slide during the process of pile sinking are deeply studied, and the influence of pile diameter, pile driving position and slope angle on safety factor of slope stability is analyzed law. The results show that the pile sinking force has an adverse effect on the slope stability, resulting in a continued decrease of the safety factor of the slope at the early stage of pile sinking. After passing through the failure plane, the safety factor of the slope remarkably increases due to the anti-slide effect of the pile body. The bigger the pile diameter is, the lower the safety coefficient is, the faster the descending speed is. However, the safety factor increases more obviously when the pile penetrates the failure plane. The closer the pile sinking position is to the top of the slope, the lower the safety factor during pile sinking The faster the speed, the lower the safety factor that leads to the most dangerous point. The larger the slope angle, the lower the overall safety factor during pile driving. The results of the analysis have certain reference value for the stability assessment and design and construction of pile sinking on slope.