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利用边坡稳定性计算方法,基于球孔弹塑性扩张理论,研究了沉桩力、桩端塑性区以及桩体抗滑作用对沉桩过程中滑动面安全系数的影响。通过算例,对沉桩全过程中滑动面安全系数变化进行了研究,并对桩径,边坡角度以及沉桩距边坡顶点距离对沉桩过程中边坡滑动面安全系数变化的影响进行了分析。结果表明:沉桩力及桩端塑性区对滑动面稳定性产生不利影响,使安全系数降低;当桩体穿过滑动面之后,桩体起到抗滑作用,显著提高滑动面安全系数。桩径越大,沉桩前期安全系数下降速度越快,但桩端穿过滑动面后安全系数提升也更加显著;边坡角度越大,沉桩后边坡安全系数越小;沉桩离边坡顶点越远,在沉桩前期由于沉桩力导致的安全系数下降速度越慢,塑性区对安全系数的影响也逐渐减缓,当沉桩远离边坡顶点距离达到一定值后,沉桩将不再对滑动面稳定性产生影响。分析结果对邻近边坡沉桩的设计和施工具有一定的实用价值。
Based on the elasto-plastic expansive theory of spheroidal holes, the influence of pile-sinking force, pile-end plasticity zone and the anti-slip effect of piles on the safety factor of sliding surface during pile driving are studied by using slope stability calculation method. Through the example, the change of the safety factor of sliding surface in the whole process of pile sinking is studied, and the influence of pile diameter, slope angle and the distance between the top of the pile sinking and the slope on the safety factor of slope sliding surface during pile driving are studied. Analysis. The results show that the pile sinking force and the plastic zone on the pile end adversely affect the stability of the sliding surface, reducing the safety factor. When the pile passes through the sliding surface, the pile acts as an anti-slip effect, which significantly improves the safety coefficient of the sliding surface. The larger the diameter of the pile, the faster the safety factor declines at the early stage of pile driving, but the safety coefficient increases more obviously when the pile head passes through the sliding face. The bigger the angle of the pile is, the smaller the safety coefficient is. The farther the vertex, the lower the safety factor due to the pile-sinking force at the early stage of pile sinking, the slower the plastic zone will affect the safety factor. When the distance between the pile pile and the top of the slope reaches a certain value, the pile sinking will no longer Affect the stability of the sliding surface. The analysis results have certain practical value for the design and construction of pile sinking near the slope.