尼山水库防吸蚀、防渗组合式幕墙技术研究
发布时间：2019-06-13 09:53
【摘要】：尼山水库位于泗河支流小沂河中游、曲阜市尼山乡境内,最大库容为1.01亿m3,包括土坝、溢洪道、输水洞及水电站等建筑物。水库建成后,对防洪、灌溉等起到了一定的作用。但是由于大坝修建在砂砾石坝基上,下伏溶洞型灰岩,没有可靠的截渗,坝基渗漏严重,坝后渗透变形,两岸坝前天然铺盖多次产生裂缝和塌坑,已危及土坝安全,长期处于病险状态。为此,必须进行全面有效的坝基防渗处理,以达到除险保坝的目的。 本课题针对工程中存在的问题,进行了坝前铺盖塌陷试验、大坝渗流计算、垂直防渗技术研究等,完成了防吸蚀、防渗组合式幕墙的研究,根据坝基岩溶性质、地质构造、裂隙率因素,采取了不同的防渗处理方案,溶洞型泥质条带灰岩带进行帷幕灌浆,对较大溶洞先适当抛填级配料后再灌浆；两岸阶地和河槽覆盖砾质粗砂段采用混凝土防渗墙方案。本课题的研究内容包括以下几个方面： 1.基于几个算法的大坝加固前渗流分析计算,石灰岩溶洞、溶槽、溶沟及裂隙发育的岩体渗流,由于岩体有强烈的各向异性,裂隙率大,渗透性也大,按一般水文地质计算有较大的困难。为了论证水库的渗漏量及两岸塌坑的原因,本文采用了多种分析方法进行分析计算。 2.根据尼山水库工程大坝坝基存在的问题和工程地质、水文地质情况,以及坝前铺盖塌陷试验研究的成果,确定尼山水库坝基应该采用垂直截渗方案。对不做防渗处理、仅做坝基基岩帷幕灌浆、仅做坝基覆盖层砼防渗墙、坝基覆盖层和基岩做组合防渗帷幕处理情况下的渗流情况进行比较分析。 3.坝坡稳定计算,分别对施工前、施工过程中和施工后的坝坡进行了稳定计算,并进行了应力应变分析。
[Abstract]:Nishan Reservoir is located in the middle reaches of Xiaoyi River, a tributary of Sihe River, and is located in Nishan Township, Qufu City. The maximum reservoir capacity is 101 million m3, including earth dams, spillways, water tunnels and hydropower stations. After the completion of the reservoir, it has played a certain role in flood control, irrigation and so on. However, because the dam is built on the gravel dam foundation, the underlying cavernous limestone, there is no reliable seepage, the dam foundation leakage is serious, the seepage deformation behind the dam, and the natural paving in front of the two sides of the dam produces cracks and craters many times, which has endangered the safety of the earth dam and is in a state of illness for a long time. Therefore, it is necessary to carry out comprehensive and effective seepage prevention treatment of dam foundation in order to achieve the purpose of eliminating danger and protecting dam. In view of the problems existing in the project, the collapse test in front of the dam, the calculation of dam seepage and the study of vertical seepage prevention technology are carried out, and the combined curtain wall of anti-erosion and seepage prevention is studied. according to the Karst properties of dam foundation, geological structure and fracture rate factors, different seepage prevention treatment schemes are adopted, and curtain grouting is carried out in limestone belt of caverns type muddy belt, and then grouting is carried out for larger caverns. Concrete impervious wall scheme is adopted in gravel coarse sand section covered with terraces and grooves on both sides of the strait. The research contents of this subject include the following aspects: 1. Based on several algorithms, the seepage analysis and calculation of limestone caverns, grooves, trenches and fissures are based on several algorithms. because of the strong anisotropy of rock mass, the fracture ratio is large and the permeability is also large, it is difficult to calculate according to the general hydrogeology. In order to demonstrate the leakage of the reservoir and the causes of the collapse on both sides of the strait, a variety of analytical methods are used to analyze and calculate the leakage of the reservoir. two銆，
本文编号：2498443
[Abstract]:Nishan Reservoir is located in the middle reaches of Xiaoyi River, a tributary of Sihe River, and is located in Nishan Township, Qufu City. The maximum reservoir capacity is 101 million m3, including earth dams, spillways, water tunnels and hydropower stations. After the completion of the reservoir, it has played a certain role in flood control, irrigation and so on. However, because the dam is built on the gravel dam foundation, the underlying cavernous limestone, there is no reliable seepage, the dam foundation leakage is serious, the seepage deformation behind the dam, and the natural paving in front of the two sides of the dam produces cracks and craters many times, which has endangered the safety of the earth dam and is in a state of illness for a long time. Therefore, it is necessary to carry out comprehensive and effective seepage prevention treatment of dam foundation in order to achieve the purpose of eliminating danger and protecting dam. In view of the problems existing in the project, the collapse test in front of the dam, the calculation of dam seepage and the study of vertical seepage prevention technology are carried out, and the combined curtain wall of anti-erosion and seepage prevention is studied. according to the Karst properties of dam foundation, geological structure and fracture rate factors, different seepage prevention treatment schemes are adopted, and curtain grouting is carried out in limestone belt of caverns type muddy belt, and then grouting is carried out for larger caverns. Concrete impervious wall scheme is adopted in gravel coarse sand section covered with terraces and grooves on both sides of the strait. The research contents of this subject include the following aspects: 1. Based on several algorithms, the seepage analysis and calculation of limestone caverns, grooves, trenches and fissures are based on several algorithms. because of the strong anisotropy of rock mass, the fracture ratio is large and the permeability is also large, it is difficult to calculate according to the general hydrogeology. In order to demonstrate the leakage of the reservoir and the causes of the collapse on both sides of the strait, a variety of analytical methods are used to analyze and calculate the leakage of the reservoir. two銆，
本文编号：2498443
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