大瑞铁路澜沧江大桥工程边坡稳定性三维数值模拟分析

采用现场调查、工程地质分析和三维数值模拟方法，对在建大瑞铁路工程澜沧江大桥边坡稳定性进行了综合分析研究。澜沧江大桥是在建大瑞铁路的控制性工程之一，由于多种因素的综合作用，桥址岸坡发育延伸较长的顺坡向节理和近垂直的陡倾节理。右岸桥位工程开挖区位于一组较大型顺坡结构面的下方，岸坡稳定性直接关系到桥位的适宜性。综合研究表明，工程开挖后，右岸桥位上部岩体极易在顺坡向结构面的控制下发生滑移–拉裂式破坏，沿外倾结构面产生较大的位移，甚至可能失稳，需要进行专门的工程治理。左岸边坡岩体结构相对稳定，工程开挖后，位移将主要集中在开挖面附近的浅表层部位，不仅变形较小，影响范围也相对较小。 

3D NUMERICAL SIMULATION OF SLOPE STABILITY OF LANCANGJIANG BRIDGE ON DALI-RUILI RAILWAY

The Lancangjiang Bridge is one of the controlled engineerings on the under-construction Dali-Ruili Railway.Along the bank slopes at which the bridge site is located there are greatly developed long-extending dip-slope joints and nearly vertical joints,The excavation area of the bridge site on right bank is below a group of large dip-slope structural planes,so the slope stability is directly related to the suitability of bridge site.Comprehensive studies show that excavation on right bank will be like to ind...