桥梁荷载下跨谷拱桥岩质桥基岸坡稳定性分析

桥梁荷载作用下跨谷岩质岸坡稳定性是保证桥梁安全运营的关键。芙蓉江大桥道真侧高陡岸坡基岩为中风化灰岩，节理裂隙发育，桥梁荷载下岸坡稳定性评价至关重要。通过基岩力学特性试验研究，得到基岩力学参数和拱座-基岩胶结面接触模型，在考虑岸坡顺层节理和垂直卸荷节理的情况下，采用强度折减法对桥梁荷载作用前后岸坡的稳定性进行三维分析，研究成果表明，受节理裂隙张开破坏的影响，岸坡将产生典型的折线型滑动面，岸坡在桥梁荷载作用下拱座底部塑性区与坡脚向上发展的塑性区首先贯通，在拱座底部产生局部破坏区，对岸坡稳定性不利，建议对拱座后部基岩进行局部加固处理，提高其稳定性。

Stablity analysis of rocky slope for arch bridge foundation in gorge area

The stability of bank is very important for safety of bridge which is constructed on it. Therefore, the stability analysis of rock bank with masses of joints and faults under bridge load should be carried out for Furongjjang bridge. Based on the laboratory tests results, the machnical parameters of bed rock and cement face between skewback and bed rock are obtained. Considering effect of beding and vertical joints, the analysis of stability of bank is done with strength reduction method. And according to the calculation results, the slide surface is a typical polygonal line because of failure of joints and faults. After the construction of bridge, a practical slide surface would form under skewback due to huge bridge load; and it is very harmful to the stability of whole bank slope. Threrefore, it is necessary to reinforce the bed rock behind the skewback.