土拱应力递减模型及其在滑坡荷载分担模型中的应用

土拱效应是抗滑桩工程发挥作用的关键内容.以土拱的应力变化为研究点，首先明确了土拱拱轴线，然后推导了新的土拱应力递减模型，由此量化了土拱关键拱形参数的计算方法，最后提出了新的滑坡荷载三级分担模型.研究结果表明:桩间土拱和桩后土拱的应力呈指数递减规律，基于土拱应力递减模型提出的拱迹线倾角和土拱厚度两个计算公式由于考虑影响因子全面因而更加切合实际;依据计算的桩后土拱和桩间土拱极限承载力可知，阶段划分的滑坡荷载三级分担模型与滑坡体-抗滑桩作用阶段特征相符合.研究可加强对土拱效应理论的理解，也可为滑坡抗滑桩设计起指导作用.

Stress-Reduction Model for Soil Arch and Its Application in Load Sharing Model for Landslide

Soil arching effect is the key research point for anti-slide piles coming into effect. Taking the stress change of soil arch as the research point， first， a reasonable arch axis for soil arch was specified， and then a new stress-reduction model for soil arch was further derived， based on which the calculation of the critical arch shape parameters of the soil arch was quantified， and last a new three-level load sharing model for landslide was proposed. Research shows that the model calculation has demonstrated an exponential reduction in the stress between and behind piles. The two equations of inclination angle at the foothold and the thickness of soil arch are more practical due to full consideration of effecting factors. According to the bearing capacity of soil arch behind and between anti-slide piles， the three-level load sharing model can be consistent with the phase characteristics of interaction between landslide mass and anti-slide pile. The research can deepen the understanding in soil arching effect theory， and can also provide theoretical guidance to the design of anti-slide piles in landslide programs.