喀什高台民居地道安全隐患分析与治理对策优化

Study on potential safety and countermeasures optimization of high-terrace folk-house tunnels in Kashgar

喀什高台民居建筑物下广泛分布的地道和地下储物空间,给高台民居建筑稳定性带来了极大的安全隐患.本文提炼了两种典型危险性隐患工况,考虑湿陷性黄土力学性能非均匀分布特征,使用RFPA对地道稳定性进行了数值模拟,研究了地道土体内部细观损伤-裂隙发育扩展-破坏面贯通-局部或整体失稳的动态演化规律,找到了两种工况的最大危险性和临界条件.针对喀什高台民居地道回填工作的复杂性和艰巨性,提出了两种可行性建议.

The high-terrace folk house in Kashgar has a widely distribution of tunnels and underground storage space under the building, which bring a great incipient danger to the stability of the building and the slope. Two typical incipient dangerous working conditions of tunnel stability are studied with RFPA, considering col- lapsible loess mechanical-property of heterogeneous distribution characteristics. The tunnel failure processes are simulated with AE to intuitively describe the dynamic evolution of soil mesoscopic damage, fracture exten- sion, fracture surface formation, and partial as well as overall failure. The maximum risk and critical condi- tions of the two kinds of working conditions are obtained. In view of the complexity and difficulty of the tunnels backfill work in Kashgar, two feasible suggestions are put forward.