坝基软弱夹层深层抗滑稳定概化地质模型研究

Study on generalized geological model for deep anti-slide of soft interlayer at dam foundation

亭子口水利枢纽坝基软弱夹层是该工程主要的工程地质问题之一。对该工程软弱夹层专题研究成果进行了一定的总结,通过分析大量小口径钻孔、大口径钻孔、平硐、竖井及野外露头所揭示的软弱夹层信息,详细研究了坝区软弱夹层的分类及其地质特征、空间分布特征及其规律,在此基础上提出了3种深层滑动的概化地质模型,结合现场试验并参照工程经验,提出了模型力学参数参考值。指出研究区内软弱夹层的形成是多种因素共同作用的结果。后期施工开挖检验了该研究成果的正确性。

Soft interlayer at dam foundation was one of the major engineering geological problems of Tingzikou Hydropower.By studying the interlayer information obtained by large and small caliber drilling holes,adit,shaft and field outcrop,the spatial distribution characteristics and laws,classification and geological features of the soft interlayer were analyzed.Three kinds of generalized geological models were put forward and their mechanical parameters were obtained by field test and engineering experiences.The results showed that the soft interlayer was formed by multiple causes.The presented results were verified true by later project excavation.