长江三峡链子崖危岩体防治工程研究

RESEARCH ON THE CONTROL ENGINEERING OF LIANZIYA DANGEROUS ROCKBODY IN THE THREE GORGES OF YANGTZE RIVER

链子崖危岩体由十几条深达煤层采空区的宽大裂缝切割而成， 总体积约３．３２×１０６ ｍ ３。它具有南北强拉裂、东西弱拉裂和平面反时针转动的三维开裂变形破坏特点。相应的变形破坏力学机制是， 以煤层采空区为压缩滑移底界， 山体呈悬板（臂梁）模式不均匀下沉并倾倒下滑。在稳定性评价的基础上， 通过建立目标函数的方法， 优选出了一种综合加固工程方案。在工程设计和施工过程中， 对工程布置、施工程序、施工工艺、工程开挖强度和施工监测等进行了持续性的跟踪优化， 并根据施工反馈及时进行了设计调整， 工程治理已取得初步成效。

The total volume of Lianziya dangerous rockbody is about 3.32 million cubic meters, and it has been cut apart by more than ten cracks going deep into coal mined out area. It is proved that Lianziya is characterized by three dimensional deforming cracking, i.e. strong pulling apart in S N direction, weak pulling apart in E W direction, and anticlockwise rotation on the horizontal. Its corresponding mechanism also is three dimensional, i.e. unequal settlement cracking toppling sliding induced from flexing moment of similar cantilever plate model by the gravity of the rockbody on coal mined out area. Based on the proposed control principles, a comprehensive reinforcement program is recommended with the method of object function. It is optimized further in construction stages that consists of engineering arrangement pattern, working courses, technological processes, digging and filling control. Engineering design has been adjusted based on the monitoring feedbacks from the construction and some good results have been achieved from control engineering.