碎石土斜坡水平受荷桩m取值研究

西南地区大量输电线路在崇山峻岭中走线，塔位多位于碎石土及破碎(或极破碎)基岩斜坡场地，该类场地中水平受荷桩m取值问题仍是工程界的一大难题。基于此，开展了4种坡度下水平受荷桩模型试验，分析不同斜坡坡度条件下碎石土场地桩身位移随水平荷载的变化、桩侧土体水平抗力沿深度的变化特点，从而确定了m与泥面位移的幂函数衰减关系式；进一步参考坡度对桩侧土体抗力变化规律的影响，给出了m计算关系式中各计算参数的确定方法。经现场载荷试验证明该方法具有较强的适用性，对提高斜坡场地结构水平抗力计算的精度具有一定的工程意义。

Valuing m of Laterally Loaded Piles on Gravelly Soil Slope

A plenty of electric transmission lines in the southwest of China cross mountain areas,with their pile foundations located in gravelly soil slope terrain grounds. The m value of horizontal-loaded piles in such foundations is still a challenge in civil engineering. Model tests of horizontal-loaded piles on slopes of four different gradients were conducted to examine the variation of pile displacement with horizontal load and the change of horizontal resistance of pile-side soil along depth direction. The corresponding relationship between the m-value and soil surface displacement can be descried into power function,and the main parameters in the function are in relation to the rate of subgrade reaction of soil in sloping area and level ground. To verify the validity of the proposed equation,an in-situ lateral loading test was performed. The research finding effectively improves the accuracy of calculating horizontal resistance of laterally loaded pile on gravelly soil slope.