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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。
The stability of the banked rock slope under bridge load is the key to ensure the safe operation of the bridge. The bedrock of the steep slope on the true side of Fuyong River Bridge Road is of the mid-aeolian limestone, with the development of joint and fissures and the stability evaluation of bank slope under the bridge load. Based on the experimental study of bedrock mechanics, the mechanical parameters of bedrock and the contact model of abutment-bedrock cemented surface were obtained. Considering the bedding joints and vertical unloading joints, The results of the research show that the typical slope-type sliding surface will be produced on the slope due to the open failure of the joint fissures, and the plastic zone and the foot of the slope at the bottom of the abutment will develop upward under the load of the bridge The plastic zone first passes through, resulting in the partial destruction zone at the bottom of the abutment. It is unfavorable to the stability of the bank slope. It is suggested to reinforce the bedrock in the back of the abutment to improve its stability.