关键词: 破裂井筒, 治理措施, 注浆, 卸压槽, 数值分析

Abstract: This paper presents an application of three-dimensional finite difference software FLAC3D to evaluate the efficiency of several treatment measures for shaft rupture induced by dewatering settlement. The treatment measures include steel set and shotcrete, grouting injection through fractured wall, surface grouting, and stress release slot in the inner shaft wall. The results indicates that the steel set and shotecrete method is suitable for emergency handling and preventing concrete collapse, but not suitable for long-term stability support. On the other hand, the injection through the shaft wall can control the displacement difference between the wall and soil to some extents. Therefore, this method, especially grouting before shaft rupture occurs is efficient for preventing shaft fracture. The surface grouting method has a good performance for solving the problem of shaft rupture. However, the locations of grout holes have significant influence on the efficiency of grouting under the same number of the holes. The stress release slot method can absorb the vertical strain and restraint the development of shaft rupture effectively. It works better when it is cut above the ruptured position. These results are helpful for the design and construction of shaft rupture treatment

Key words: ruptured shaft, treatment measures, grouting, stress release slot, numerical analysis