望丰水库重力坝坝基陡倾断层处理研究

Study on steep dip Fault treatment of Gravity Dam Foundation of Wangfeng Reservoir

断层是重力坝坝基常见的一种地质缺陷,因地制宜的处理断层是水利工程建设中需要解决的关键技术问题。望丰水库坝基河床部位存在顺河向陡倾断层,对重力坝的抗滑稳定、沉降变形非常不利。通过对断层的勘探分析,查清了断层及影响带的地质性状,提出了混凝土塞、钢筋混凝土承载板、加强固结灌浆的一种综合处理措施,以提高坝基承载力、减少不均匀变形。同时,结合材料力学法、有限元法对坝基抗滑稳定、应力变形进行了计算分析,表明望丰水库重力坝坝基综合处理措施是合理可行的。

Fault is a common geological defect of gravity dam foundation.How to deal with fault according to local conditions is a key technical problem to be solved in the construction of water conservancy project.There is a steep dip fault along the river in the riverbed of the dam foundation of Wangfeng Reservoir,which is very disadvantageous to the anti-sliding stability,settlement and deformation of the gravity dam.Through the exploration and analysis of faults,the geological characteristics of faults and influence zones are found out,and a comprehensive treatment measure of concrete plug,reinforced concrete bearing plate and strengthening consolidation grouting is put forward in order to improve the bearing capacity of dam foundation and reduce uneven deformation.At the same time,combined with the material mechanics method and the finite element method,the anti-sliding stability and stress and deformation of the dam foundation are calculated and analyzed,which shows that the comprehensive treatment measures of the gravity dam foundation of Wangfeng Reservoir are reasonable and feasible.