黄河上游某电站上新统石膏夹层对坝基岩体稳定性影响评价

EVALUATION ON INFLUENCE OF THE PLIOCENE GYPSUM LAYER ON STABILITY OF DAM BASE AT A HYDROPOWER PLANT ON THE UPSTREAM OF THE YELLOW RIVER

拟建的黄河上游某水电站在勘查过程中发现在河床以下存在一层厚约2m的石膏层。石膏岩遇水易溶解,工程地质性质较差,力学强度较低,是水电建设中的不良岩体。本文对石膏岩的物理力学性质和化学成分做了仔细分析,分析了石膏溶蚀后对坝基稳定性的影响,找出防止石膏溶蚀的判断标准,最后得出防治措施。

A gypsum layer of 2 meters thickness lies beneath the riverbed at a hydropower plant on the upstream of the Yellow River. Gypsum is easy to collapse when encountering water. It is the least favorable rockmass for construction of the hydropower plant because of its weak engineering geological properties and low mechanical strength. This paper assesses impacts of dissolution of the gypsum layer on the stability of dam base and provides guidelines for minimizing or preventing such impacts.