四川威远县是一个产煤区,采煤历史较长,有些水库位于采区内.由于煤层不厚,且埋藏甚深,通常认为不致影响地面上低坝的安全.近年来,位于采空区的金鸡桥、深沟二水库砌石拱坝,发生了严重开裂,而且不断恶化,方引起重视.本文就此问题作一介绍和 Weiyuan County in Sichuan Province is a coal-producing area with a long history of coal mining and some reservoirs located in the mining area. Due to the thick coal seam and its deep burial, it is generally not considered to affect the safety of low-lying dams on the ground. In recent years, Area of ​​the Golden Rooster Bridge, deep trench ditch stone masonry dam, there has been a serious crack, and deteriorating, square attention .In this paper, an introduction and