黄龙滩电厂扩建工程进场边坡有限元分析

Finite element analysis of entrance slope of expansion project of Huanglongtan Power Plant

简要地介绍了黄龙滩电厂扩建工程概况以及该工程进场边坡坍塌情况,指出维护该边坡稳定性要进行治理的必要性。根据工程卸荷特点和相关文献资料,绘制了边坡岩体卸荷量与变形模量的关系图。分析进场边坡的工程特点,采用了卸荷岩体力学理论与方法对该边坡进行有限元分析,分为初始应力场、边坡开挖、边坡开挖卸荷、边坡加固等4种工况进行计算,得出边坡变形的相关规律,运用卸荷岩体力学理论计算所得的最大水平和竖直位移比常规计算的位移值都要大,且其在各个剖面的变化规律基本是一致的。加固措施对边坡开挖面水平位移的约束不明显,但对开挖面附近区域的应力状态有较大的改善,利于边坡的稳定。研究结果可为边坡的加固设计提供参考。

The collapse situation of entrance slope of expansion project of Huanglongtan Power Plant is introduced. The maintenance of the stability of the slope to the need for governance is pointed out. According to the characteristics of unloading rock mass and the related documents, the relation graph between the unloading quantity and the deformation modulus of slope rock mass is displayed. According to the characteristics of the entrance slope, by using the mechanics theory of unloading rock mass and the finite element method, four kinds of conditions for slope analysis are adopted, that is, the initial stress field, excavation, unloading excavation and reinforcement. The values of the maximum horizontal and vertical displacement calculated by use of the unloading rock mass mechanics theory are larger than those by the conventional methods. The variation is substantially the same for each profile. The constraint of the reinforcement measures to the horizontal displacement of excavation face of slope is not obvious, but the stress state of the surrounding area of the excavation face is greatly improved and the stability of the slope is strengthened. The results may provide a reference for the design of slope reinforcement.