水电站坝基岩体质量分级研究

Classification of rock mass quality of dam foundation of hydropower station

水电工程建设在可行性研究阶段、招标阶段及技施开挖阶段均需进行建基面选择,而坝基建基面选择是否合理不仅关系工程质量和安全,同时跟工程造价和工期息息相关。结合某可行性研究阶段水电工程,依据相关规范条文及规定,通过坝址区岩性、地质构造、风化、卸荷等地质条件的调查和分析,结合坝址钻孔岩芯RQD测量、吕荣值、钻孔声波等勘探方法,从而确定坝基岩体工程地质定性、定量分类原则,经各定量因素加权平均并参照类似工程调整后最终确定坝基岩体质量分级,提出坝基开挖深度及建基面,保证了工程质量的同时缩短了工期,取得了较好的综合效益。

The base surface in construction of the hydropower project should be selected in the feasibility study stage,the bidding stage and the technology excavation stage.However,the selection of base surface of dam foundation is not only related to the quality and safety of the engineering,at the same time,it is closely related to the cost and time limit of the project.This paper combines a feasibility study stage of hydropower engineering,according to the relevant provisions,through the investigation and analysis of geological conditions such as litho logy,geological structure,airs lake and unloading in dam site area,combined with drilling site RQD survey,Lv Rongzhi,borehole acoustic wave and other exploration methods,the qualitative and its classification principle of engineering geology of dam foundation rock mass is determined.Finally,the rock mass quality classification of the dam foundation is determined by the weighted average of the quantitative factors and the adjustment of similar projects.The excavation depth and foundation surface of dam foundation are put forward.It ensures the quality of the project and shortens the construction period,which will bring good comprehensive benefits.