余干县寨里水库枢纽工程除险加固的设计与研究
发布时间：2019-06-18 13:03
【摘要】：寨里水库是一座以灌溉为主,同时兼顾防洪、泄洪、蓄水、养殖等综合效益的小(一)型水库。所在水系为信江一级支流的珠桥河,位于余干县黄埠镇寨里村委会宋霞源村,工程主要建筑物包含大坝、溢洪道、灌溉输水隧洞等。经有关部门安全鉴定,寨里水库枢纽工程存在严重工程安全隐患:其一大坝坝体、坝基存在渗漏且绕坝渗流,上游护坡面已冲刷、风化严重,块石有架空、脱落和翻动等现象,下游坝坡不平整,浸润线在下游贴坡排水体之上出逸,贴坡排水体已失去排水作用,坝坡处于不稳定状态;其二溢洪道结构布置不合理,浆砌石堰体剥蚀老化,出现裂缝,进口右侧山坡存在边坡稳定问题,泄槽两侧边坡岩石破碎,风化严重,多处断裂,边墙没有设置防渗齿刺墙,渠道多处倒塌;其三输水建筑物灌溉涵管强度极低,剥落严重,管身出现错位、断裂,管壁漏水严重,灌溉隧洞出现蜂窝麻面和裂缝,存在渗水现象。针对寨里水库枢纽工程存在以上的病情险况,本文进行探讨枢纽工程除险加固设计,主要包含以下三个方面:1、大坝加固设计对大坝坝体渗漏问题,进行了坝中塑性混凝土防渗墙方案和旋喷水泥桩防渗墙加固方案进行对比,因旋喷水泥桩防渗墙加固方案更能适应本工程地质条件,施工技术成熟、质量与工期更易保证,且投资较省,加固后大坝安全可靠,所以优选了旋喷水泥桩防渗墙加固方案;对坝基及坝肩绕坝渗漏处理采用帷幕灌浆措施;对大坝上游护坡进行混凝土预制块护坡,整平坡面,重新种植草皮;下游坝坡进行填土夯实,草皮护坡,坝面设置纵、横向以及岸坡排水沟,实现了大坝防渗加固的效果。2、溢洪道加固设计经过方案对比,采用新址重建溢流堰方案,将原侧槽式溢洪道改建成正槽式溢洪道,对溢洪道起到较好的加固作用,既不会增加开挖工程量,且过堰水流在高水位下仍为自由出流,水流条件得到了改善,使堰体长度缩短了近一半,又不会降底原侧槽底板高程,同时开挖工程量小,节省投资。3、输水建筑物加固设计采用异地新建隧洞加固输水建筑物方案,对农田可以起到良好的灌溉作用,在经济、技术两方面,异地新建引水隧洞方案更加切实可行。寨里水库枢纽工程通过除险加固,解除了寨里水库的安全隐患,可以保护下游人民群众的生命财产安全,农田、国道、公路、工厂等也可避免破坏,同时对社会发挥灌溉、防洪、泄洪、蓄水、养殖等综合效益。
[Abstract]:Zhai Li Reservoir is a small (1) reservoir which is mainly irrigated and takes into account the comprehensive benefits of flood control, flood discharge, water storage, aquaculture and so on. The water system is the Zhuqiao River, which is the first tributary of Xinjiang River. It is located in Song Xiayuan Village, Huangbu Town, Yugan County. The main buildings of the project include dams, spillways, irrigation tunnels and so on. Through the safety appraisal of the relevant departments, there are serious hidden dangers in the safety of the Zhai Reservoir Hub Project: first, the dam body, the dam foundation has leakage and seepage around the dam, the upstream slope protection surface has been scoured, the weathered surface has been seriously weathered, the block stone has been overhead, shedding and overturning, the downstream dam slope is uneven, the infiltration line runs out on the downstream slope drainage body, the slope drainage body has lost its drainage function, and the dam slope is in an unstable state; Second, the structure arrangement of spillway is unreasonable, masonry Weir body denudation aging, cracks appear, the slope stability problem exists on the right side of the inlet slope, the rock on both sides of the drain channel is broken, the weathered rock is serious, many faults are found, the side wall is not equipped with anti-seepage tooth piercing wall, and the channel collapses in many places. In the third water transmission structure, the intensity of irrigation culvert is very low, the spalling is serious, the pipe body is mispositioned, the pipe wall is broken, the leakage of pipe wall is serious, the honeycomb hemp surface and crack appear in irrigation tunnel, and there is water seepage phenomenon. In view of the above dangerous condition of Zhai Li reservoir hub project, this paper discusses the reinforcement design of the hub project, which mainly includes the following three aspects: 1. The dam reinforcement design compares the plastic concrete impervious wall scheme and the rotary jet cement pile impervious wall reinforcement scheme in the dam, because the rotary jet grouting cement pile impervious wall reinforcement scheme can better adapt to the geological conditions of the project, and the construction technology is mature. The quality and construction period are easier to guarantee, and the investment is less, and the dam is safe and reliable after reinforcement, so the reinforcement scheme of rotary jet grouting cement pile impervious wall is optimized. Curtain grouting measures are adopted to treat the leakage of dam foundation and dam shoulder around the dam, and concrete precast block slope protection is carried out on the upstream slope of the dam, the slope is flattened and the turf is replanted. The downstream dam slope is filled with compaction, turf slope protection, dam surface vertical, transverse and bank slope drainage ditch, which realizes the effect of dam seepage prevention and reinforcement. 2, the spillway reinforcement design is compared by using the new site to reconstruct the spillway, and the original side channel spillway is converted into the positive channel spillway, which plays a better role in strengthening the spillway, which will not increase the amount of excavation engineering. And the flow through the Weir is still free at high water level, and the flow conditions have been improved, so that the length of the Weir body has been shortened by nearly half, and the elevation of the bottom plate of the original side groove will not be reduced. At the same time, the excavation quantity is small and the investment is saved. 3. The reinforcement design of the water diversion structure adopts the scheme of strengthening the water transmission structure with new tunnels in different places, which can play a good irrigation role in the farmland. It is more feasible to build a new diversion tunnel in different places. Through danger removal and reinforcement, the Zili reservoir hub project has lifted the hidden danger of Zili reservoir safety, can protect the life and property safety of the downstream people, farmland, national roads, factories and so on can also avoid damage, and at the same time give full play to the comprehensive benefits of irrigation, flood control, flood discharge, water storage, breeding and so on.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV697.3
[Abstract]:Zhai Li Reservoir is a small (1) reservoir which is mainly irrigated and takes into account the comprehensive benefits of flood control, flood discharge, water storage, aquaculture and so on. The water system is the Zhuqiao River, which is the first tributary of Xinjiang River. It is located in Song Xiayuan Village, Huangbu Town, Yugan County. The main buildings of the project include dams, spillways, irrigation tunnels and so on. Through the safety appraisal of the relevant departments, there are serious hidden dangers in the safety of the Zhai Reservoir Hub Project: first, the dam body, the dam foundation has leakage and seepage around the dam, the upstream slope protection surface has been scoured, the weathered surface has been seriously weathered, the block stone has been overhead, shedding and overturning, the downstream dam slope is uneven, the infiltration line runs out on the downstream slope drainage body, the slope drainage body has lost its drainage function, and the dam slope is in an unstable state; Second, the structure arrangement of spillway is unreasonable, masonry Weir body denudation aging, cracks appear, the slope stability problem exists on the right side of the inlet slope, the rock on both sides of the drain channel is broken, the weathered rock is serious, many faults are found, the side wall is not equipped with anti-seepage tooth piercing wall, and the channel collapses in many places. In the third water transmission structure, the intensity of irrigation culvert is very low, the spalling is serious, the pipe body is mispositioned, the pipe wall is broken, the leakage of pipe wall is serious, the honeycomb hemp surface and crack appear in irrigation tunnel, and there is water seepage phenomenon. In view of the above dangerous condition of Zhai Li reservoir hub project, this paper discusses the reinforcement design of the hub project, which mainly includes the following three aspects: 1. The dam reinforcement design compares the plastic concrete impervious wall scheme and the rotary jet cement pile impervious wall reinforcement scheme in the dam, because the rotary jet grouting cement pile impervious wall reinforcement scheme can better adapt to the geological conditions of the project, and the construction technology is mature. The quality and construction period are easier to guarantee, and the investment is less, and the dam is safe and reliable after reinforcement, so the reinforcement scheme of rotary jet grouting cement pile impervious wall is optimized. Curtain grouting measures are adopted to treat the leakage of dam foundation and dam shoulder around the dam, and concrete precast block slope protection is carried out on the upstream slope of the dam, the slope is flattened and the turf is replanted. The downstream dam slope is filled with compaction, turf slope protection, dam surface vertical, transverse and bank slope drainage ditch, which realizes the effect of dam seepage prevention and reinforcement. 2, the spillway reinforcement design is compared by using the new site to reconstruct the spillway, and the original side channel spillway is converted into the positive channel spillway, which plays a better role in strengthening the spillway, which will not increase the amount of excavation engineering. And the flow through the Weir is still free at high water level, and the flow conditions have been improved, so that the length of the Weir body has been shortened by nearly half, and the elevation of the bottom plate of the original side groove will not be reduced. At the same time, the excavation quantity is small and the investment is saved. 3. The reinforcement design of the water diversion structure adopts the scheme of strengthening the water transmission structure with new tunnels in different places, which can play a good irrigation role in the farmland. It is more feasible to build a new diversion tunnel in different places. Through danger removal and reinforcement, the Zili reservoir hub project has lifted the hidden danger of Zili reservoir safety, can protect the life and property safety of the downstream people, farmland, national roads, factories and so on can also avoid damage, and at the same time give full play to the comprehensive benefits of irrigation, flood control, flood discharge, water storage, breeding and so on.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV697.3
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