桩锚挡墙联合支护残积土边坡离心模型试验研究

利用土工离心机分别对钢轨桩、锚杆联合重力式挡土墙支护土质边坡的效果进行模型对比试验研究，分析了钢轨桩和锚杆在重力式挡土墙支护土质边坡中的作用。试验结果表明，强降雨诱发重力式挡土墙支护下的残积土边坡产生滑动变形，对边坡稳定构成威胁；挡土墙下打入钢轨桩联合支护土质边坡会大大降低因降雨产生的墙体偏移，但墙顶上部坡体的局部浅层滑动仍不可避免；植入墙顶上部坡体内并锚固于墙身的锚杆对边坡局部浅层滑动起到了很好的抑制作用。在不增加挡墙自重前提下，钢轨桩下延作用以及锚杆锚固作用提升了挡土墙的抗倾覆能力和边坡浅层抗滑塌能力，从坡体内部和浅层同时改善了重力式挡土墙的支护效果；钢轨桩和锚杆的使用均布了挡土墙背部土压力，有效避免了局部应力集中。

Centrifugal model test on slope supporting with pile-anchor combined retaining wall

Comparative study of the model using geotechnical centrifuge for rail pile and anchor combined gravity retaining wall supporting soil slope are carried out respectively. The key roles of rail pile and anchor in the gravity-type retaining wall supporting soil slope are analyzed. The results show that the sliding deformation of soil slope supporting with gravity retaining wall is induced by heavy rainfall, threatening the stability of the slope. The rail pile which is nailed into foundation and retaining wall could reduced the wall offset greatly due to rainfall; but the local shallow slide at the top of the wall of the upper slope is inevitable. The anchor which is implanted in the upper slope and top of the wall can be inhibited the shallow slip on the slope. Without increasing weight, the ability of wall anti-overturning and shallow anti-slump are increased by the extension role of rail piles and anchoring role of the anchor the retaining wall under the premise of the next extension of the role of rail piles and retaining wall anchoring role of the anchor. The supporting effect of gravity retaining wall is improved from the slope of deep and shallow at the same time. Another the earth pressure of the retaining wall back is uniformed by using rail piles and anchor; the local stress concentration is avoided effectively.