帷幕灌浆在西藏阿涡夺水库大坝基础防渗处理中的应用

发布时间：2018-04-11 05:41

本文选题：粘土心墙 + 堆石坝　；参考：《吉林大学》2014年硕士论文

【摘要】：阿涡夺水库位于西藏自治区隆子县境内，隆子河左岸支流。大坝坝基存在及其复杂特殊的地质条件，其坝基岩层顺河向、倾角陡、有着极为发育的张开性节理裂隙，产状多变，且风化破碎带埋深较大[1]。基于以上客观因素，为满足下游灌溉需要，结合实际渗水情况，先后两次对大坝进行帷幕灌浆。由于其复杂地质条件2003年的第一期帷幕灌浆并未取得良好的防渗效果。本文将重点解析后期的补强帷幕灌浆阶段。经过多次试验研究与实地考察，最终确定了“以堵为主，堵灌结合”的可控补灌基本施工方案及其对该类型地质条件的作用效果。根据实地情况，参照现行的水利水电相关规范，在施工方案中采用了在国际上较为先进灌浆理念和GIN灌浆法。2007年5月在大坝左坝肩进行了试现场补强灌浆试验，取得了不错的效果。之后又先后进行了主河床段、左岸山体、右岸平硐的帷幕补强灌浆和副帷幕补强灌浆，并对右坝肩采用高压旋喷灌浆和针对输水洞的“密封圈”帷幕灌浆等主要工作。经过了历时三年的努力整个大坝基础防渗补强工程基本结束。最终检查孔取芯率90%以上，RQD值为15~50%，岩体节理裂隙发育，节理多数张开，表面见铁锰质浸染，水泥结石充填于节理裂隙中，孔壁稳固。主河床段及右岸平洞部位检查孔压水透水率97%以上孔段小于10Lu，，为合格检查孔。个别孔段出现的稍大于10Lu的情况，在其两侧补充检查，补充孔检查结果为，透水率小于10Lu，说明该部位透水率稍高为极个别孤立现象，并不存在集中渗漏通道。[2]最终制定的补强帷幕灌浆设计方案在阿涡夺水库大坝坝基防渗处理施工中起到了很好的效果。本次补强帷幕灌浆在阿涡夺水库防渗工作中的成功应用满足了水库下游藏民灌溉取水需要，也为本地区或类似地质条件的水利工程基础防渗处理提供了参考依据。
[Abstract]:Avoudou Reservoir is located in Longzi County, Tibet Autonomous region, the left bank of the Longzi River tributaries.The dam foundation exists and its complex special geological conditions. The rock layer of the dam foundation is along the river direction, steep dip, has extremely developed open joint fissure, the occurrence is changeable, and the weathering broken zone buries the depth is big [1].Based on the above objective factors, in order to meet the demand of downstream irrigation, combined with the actual seepage situation, the curtain grouting of the dam was carried out twice in succession.Because of its complicated geological conditions, the first stage of curtain grouting in 2003 did not achieve good seepage control effect.This paper will focus on the later stage of reinforcement curtain grouting stage.After many experiments and field investigations, the basic construction scheme of controlled supplementary irrigation and its effect on this type of geological conditions have been determined, which is based on plugging and combining plugging and irrigation.According to the actual situation and referring to the relevant codes of water conservancy and hydropower, the advanced grouting concept and GIN grouting method are adopted in the construction scheme. In May 2007, the site reinforcement grouting test was carried out on the left abutment of the dam.Good results have been achieved.After that, the curtain reinforcement grouting and the auxiliary curtain reinforcement grouting of the main river bed section, the left bank mountain body, the right bank adit and the right dam abutment were carried out successively, and the main work such as the high pressure rotary grouting and the "sealing ring" curtain grouting for the water conveyance tunnel were carried out.After three years of efforts, the whole dam foundation seepage reinforcement project is basically over.At last, the RQD value of 90% or more holes is 15 ~ 50, the joints of rock mass are developed, the majority of joints are open, the surface is stained with iron and manganese, the cement stone is filled in the joint fissure, and the wall of the hole is firm.The hole pressure and water permeability of the main river bed section and the right bank of the flat hole are less than 10 Lu. it is qualified to check the hole.In the case of a little larger than 10Lu in some pore segments, the supplementary inspection on both sides of the hole shows that the water permeability is less than 10 Lu. which indicates that the high permeability of this part is a very isolated phenomenon.There is no centralized seepage channel. [2] the final design scheme of reinforcement curtain grouting has played a very good role in the seepage control construction of the dam foundation of the Awangzhao reservoir.The successful application of the reinforcement curtain grouting in the impervious work of the Awangdou Reservoir meets the needs of the reservoir downstream Tibetans for irrigation and water intake, and also provides a reference basis for the basic seepage prevention treatment of water conservancy projects in this area or similar geological conditions.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV543.5

【相似文献】