破碎岩体隧道洞口开挖诱导滑坡与古滑坡耦合分析

以大栗树高速公路隧道洞口施工为工程背景，研究了在考虑古滑坡因素下洞口工作面边坡失稳及其加固技术。利用钻孔测斜数据（BCD）和Midas GTS折减强度有限元分析模型，分别推测了最危险滑动面，得知两者滑动面位置相似。并采用不平衡推力传递法，基于BCD推断滑动面计算安全系数。以BCD和有限元法的滑动面为基础，将滑动面近似假设为对数螺旋线，考虑地形因素，建立考虑多台阶边坡上限分析模型，研究了不同加固措施对边坡稳定的影响。结果表明，3种方法计算出的边坡安全系数结果相近。

Coupling Analysis of Induced and Ancient Landslides by the Excavation of Tunnel Portal in Cracked Rock Mass

Taking the construction of the Dalishu Expressway tunnel entrance as the engineering background, an investigation has been made of the instability and reinforcement technology of the entrance working face slope with ancient landslide factors taken into consideration. By using borehole inclination data (BCD) and Midas GTS reduced strength finite element analysis model, the most dangerous sliding surface is speculated separately, with the results showing that the positions of the two sliding surfaces are found to be similar. By using unbalanced thrust transfer method, safety factor can be calculated based on BCD inference of the sliding surface. Based on the sliding surface of BCD and the finite element method, the sliding surface is approximately assumed to be a logarithmic spiral, considering terrain factors, with a multi-step slope upper limit analysis model established to study the impact of different reinforcement measures on slope stability. The results indicate that there is a similarity berween the slope safety factors calculated by the three methods.