重力式砌石挡土墙的因素敏感性计算分析

为了研究山区公路砌石高挡土墙变形破坏的产生机理并提出有效加固措施，结合浙江58省道重力式砌石挡土墙实例，采用不平衡推力法，对影响山区公路砌石高挡土墙的因素敏感性进行分析。研究结果表明，按因素敏感度从大到小排列，影响浆砌石重力式挡土墙整体稳定性的主要因素为潜在滑动面岩土体的内摩擦角、潜在滑动体饱水面积比、墙高、潜在滑动面岩土体的粘聚力和墙后填土的重度；影响浆砌石重力式挡土墙的最主要因素为潜在滑动面岩土体的内摩擦角和潜在滑动体饱水面积比；在对砌石高挡土墙进行加固处理时，必须优先考虑在墙身设置足够排水孔和选择渗透性好的填料的措施。

Calculation and Analysis on Factor Sensitivity of Gravity Masonry Retaining Wall

In order to study the deformation and failure mechanism of high masonry retaining wall along mountainous highway and propose effective reinforcement measures, imbalanced thrust force method is used, combined with the gravity masonry retaining wall along Provincial Highway 58 in Zhejiang, to analyze the sensitivity of factors influencing such wall along mountainous highway. The result shows that according to the ranking of sensitivity, the main factors influencing the overall stability of such wall are internal frictional angle of potential-sliding-surface rock and soil mass, saturation-area ration of potential sliding mass, height of wall, cohesion of potential-sliding-surface rock and soil mass and gravity of rolling earth behind retaining wall, wherein the most important are the internal frictional angle and the saturation-area ration. Thus when the wall is reinforced, enough drain holes on the wall must be taken into consideration firstly and backfill with good penetrating performance must be used.