本文關(guān)鍵詞：深厚覆蓋層高土石圍堰堰坡穩(wěn)定研究　出處：《三峽大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 深厚覆蓋層 土石圍堰 滲流分析 堰坡穩(wěn)定 非線性抗剪強(qiáng)度

【摘要】：圍堰是導(dǎo)流工程中用來圍護(hù)基坑，保證水工建筑物能在干地施工的臨時(shí)擋水建筑物，其布局和施工程序?qū)こ淌┕じ窬制饹Q定作用，，并對(duì)工程總進(jìn)度和工程質(zhì)量有重要影響。圍堰的安全至關(guān)重要，不僅關(guān)系到整個(gè)施工導(dǎo)流工程和主體工程的安全和進(jìn)度，甚至涉及下游的安全問題。近年來，隨著水利水電工程建設(shè)的重心進(jìn)一步向西南地區(qū)轉(zhuǎn)移，深厚覆蓋層的問題越來越突出，圍堰的施工運(yùn)行管理難度更大。本文以某深厚覆蓋層土石圍堰為研究對(duì)象，在滲流分析的基礎(chǔ)上對(duì)圍堰堰坡穩(wěn)定進(jìn)行了研究。主要工作內(nèi)容如下： （1）介紹了滲流計(jì)算和邊坡穩(wěn)定計(jì)算的基本原理和方法，基于非線性粗粒料的抗剪強(qiáng)度理論和一種新的堰坡最危險(xiǎn)滑弧搜索法，編制了一套考慮非線性抗剪強(qiáng)度堰坡穩(wěn)定性分析程序。 （2）模擬了圍堰施工及運(yùn)行階段：戧堤截流、基坑抽水、基坑開挖、上游退水等過程圍堰滲流場變化及對(duì)各階段圍堰堰坡進(jìn)行了抗滑穩(wěn)定分析。 （3）計(jì)算分析圍堰基坑抽水速度、基坑開挖速度、上游退水速度、覆蓋層滲透特性及防滲墻不同程度不同形式局部破損等影響因素對(duì)圍堰滲流的影響，從浸潤線溢流出口比降、單寬流量、防滲墻所受最大比降等指標(biāo)得出了相應(yīng)的結(jié)論。 （4）在滲流分析的基礎(chǔ)上，利用非線性抗剪強(qiáng)度堰坡穩(wěn)定性分析程序?qū)哐咂碌母鞣N工況進(jìn)行穩(wěn)定性計(jì)算，得出堰坡最危險(xiǎn)滑弧及最小安全系數(shù)。考慮影響滲流的幾個(gè)影響因子，對(duì)圍堰堰坡進(jìn)行穩(wěn)定分析，通過抗滑穩(wěn)定最小安全系數(shù)得出了相應(yīng)結(jié)論。
[Abstract]:Cofferdam is a temporary water retaining structure which is used in diversion engineering to protect foundation pit and ensure hydraulic structure can be constructed on dry land. Its layout and construction procedure play a decisive role in the construction pattern of the project. The safety of cofferdam is very important, which not only relates to the safety and progress of the whole construction diversion project and the main project, but also involves the safety problems of downstream in recent years. As the center of gravity of water conservancy and hydropower projects is further shifted to the southwest, the problem of deep overburden becomes more and more prominent. The construction management of cofferdam is more difficult. In this paper, the stability of cofferdam slope is studied on the basis of seepage analysis, taking a deep overburden earth-rock cofferdam as research object. The main work is as follows: 1) the basic principles and methods of seepage calculation and slope stability calculation are introduced, based on the shear strength theory of nonlinear coarse granular materials and a new method of the most dangerous sliding arc search for Weir slope. A program for stability analysis of Weir slope considering nonlinear shear strength is developed. 2) the seepage field changes of cofferdam are simulated during the construction and operation stage of cofferdam, such as closure of embankment, pumping of foundation pit, excavation of foundation pit and upstream receding water, and the stability analysis of anti-slide of cofferdam slope in each stage is carried out. 3) the influence factors on cofferdam seepage are calculated and analyzed, such as pumping speed of cofferdam foundation pit, excavation speed of foundation pit, upstream retreating speed, permeation characteristic of overburden and local damage of impervious wall in different degree. The corresponding conclusions are obtained from the ratio drop of the overflow outlet, the single wide flow rate, and the maximum ratio drop of the impervious wall. 4) on the basis of seepage analysis, the stability of cofferdam slope is calculated by using nonlinear shear strength Weir slope stability analysis program. The most dangerous sliding arc and minimum safety factor of Weir slope are obtained. Considering several influence factors affecting seepage flow, the stability of cofferdam slope is analyzed, and the corresponding conclusion is drawn through the minimum safety factor of anti-slide stability.
【學(xué)位授予單位】：三峽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TV551.31;TV223

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