增湿过程中结构性黄土强度对抗滑桩间距的影响

Effects of structural loess strength on interval of anti-slide piles during humidification process

【目的】探讨增湿、扰动作用下结构性参数降低对土性参数和抗滑桩间距的影响。【方法】通过单轴压缩试验,分析初始结构性参数随含水率变化的规律以及构度指标变化对结构性土黏聚力和内摩擦角的影响。在抗滑桩拱端的土拱效应中,通过静力平衡方程建立拱间距与黏聚力的关系,并将构度指标对黏聚力的影响引入公式,从而分析构度指标变化对土拱间距的影响。【结果】构度指标随含水率的增大而减小,构度指标减弱导致黏聚力明显降低而内摩擦角变化较小,在增湿过程中将构度指标引入抗滑桩间距计算公式,其变化直接影响到抗滑桩间距的大小。【结论】构度指标是影响抗滑桩间距大小的最主要因素之一,在抗滑桩设计中引入结构性参数这一指标,为合理确定抗滑桩间距提供了一种新的方法和理论。

【Objective】The influences of reduction of structural parameter under humidification and disturbance conditions on soil strength and interval between anti-slide piles were investigated.【Method】The change of initial structural parameter along with water content and influence of structural index on cohesion and angle of internal fraction were analyzed based on uniaxial compression tests.The relation between interval of anti-slide piles and cohesion was established via the static equilibrium equation reflecting the stress conditions of arched soil between ends of anti-slide piles.Structural parameter of soil was also introduced to the cohesion to consider the effect of structure on interval between anti-slide piles.【Result】Structural index decreased with the increase of water content,which decreased cohesion significantly and affected angle of internal frication.The interval between anti-slide piles related with the change of structural parameter after it was introduced into the computational formula.【Conclusion】Structural index was one of the most important factors to determine interval of anti-slide piles.This paper presented a new method or theory to determine the interval between anti-slide piles by introducing structural parameter.