错综复杂山区桥址岩体结构参数及稳定性研究

以地处"三高""四活跃"地质条件下的上坝大桥为例,在对地质条件进行深入分析的基础上,采用现场试验和室内试验的方法,运用Barton模型确定参数,并采用地质条件、有限元分析、SMR、数值模拟等方法对岸坡自然状态、工程状态和地震条件下边坡的稳定性进行了分析。研究结果表明:天然状态下,瑞丽端、保山端岸坡自然稳定坡角分别为39.9°,41.6°,均小于实际坡角;天然状态下,瑞丽端、保山端岸坡的稳定安全系数为2.00、2.20,岸坡均处于稳定状态;桥梁荷载作用下,瑞丽端、保山端岸坡的稳定安全系数为1.60,1.70,岸坡均处于稳定状态。

Study on Structure Parameters and Stability of Rock Mass at Bridge Site in Complex Mountainous Areas

Taking Shangba Bridge that is under very complex geological conditions as an example, on the basis of deep analysis on the geological condition, the stability of the bank slope, which is respectively in natural, engineering and seismic conditions, was studied by means of geological condition, finite element analysis, SMR and numerical simulation, wherein the parameters were defined through field and indoor tests, and then by Barton model. The study results show that, when in the natural state, the bank slope at the side of Ruili and Baoshan has the angle of 39.9° and 41.6° respectively, both less than the actual slope angle, and in this state, the bank slope has the safety factor of 2.00 and 2.20, being in a stable state; when under the action of bridge load, the bank slope at the side of Ruili and Baoshan has the safety factor of 1.60 and 1.70 respectively, being in a stable state as well.