發(fā)布時(shí)間：2018-08-12 16:52

【摘要】：為實(shí)現(xiàn)中華民族的偉大復(fù)興奠定堅(jiān)實(shí)的物質(zhì)基礎(chǔ)，進(jìn)入新世紀(jì)以來，我國各級政府加大了對水電事業(yè)的開發(fā)力度，水電站的修建過程中，各類邊坡穩(wěn)定性的問題和治理變得不容忽視。由于川藏之間特殊的地形地貌，高崖陡壁，深切河谷遍布，各類自然邊坡和工程邊坡的穩(wěn)定性評價(jià)、破壞模式和破壞過程分析顯得尤其重要。猴子巖水電站導(dǎo)流洞進(jìn)口邊坡就是這類邊坡中的一個(gè)。由于導(dǎo)流洞完成導(dǎo)流作用之后將被改造成泄洪洞，并非一個(gè)臨時(shí)工程，所以導(dǎo)流洞邊坡的穩(wěn)定性對整個(gè)工程的正常運(yùn)行有非常重要的意義。 本文以猴子巖水電站左岸導(dǎo)流洞進(jìn)口邊坡為主要研究對象，在調(diào)查、收集、分析壩址區(qū)的區(qū)域地理環(huán)境條件、地層巖性、地質(zhì)構(gòu)造、水文地質(zhì)的基礎(chǔ)上，著重分析了導(dǎo)流洞邊坡區(qū)的地層巖性、地質(zhì)構(gòu)造、水文地質(zhì)，并深入分析了導(dǎo)流洞進(jìn)口邊坡的巖體結(jié)構(gòu)特征，包括巖石特性、結(jié)構(gòu)面特征和形狀。在這些工作的基礎(chǔ)上，分析了邊坡開挖后可能的破壞模式和潛在滑動面，本文采用剛體極限平衡法，以Slide軟件為工具，對潛在滑動面進(jìn)行安全系數(shù)計(jì)算，并利用離散元軟件UDEC模擬自然邊坡變形情況和開挖破壞動態(tài)過程以及支護(hù)后變形分析，最后利用計(jì)算結(jié)果給出支護(hù)改良建議。具體內(nèi)容如下： 結(jié)合野外地質(zhì)調(diào)查資料，比較全面的總結(jié)了猴子巖水電站導(dǎo)流洞進(jìn)口邊坡的巖體結(jié)構(gòu)特征，并且初步建立了地質(zhì)模型。將邊坡巖體質(zhì)量分為Ⅲ、Ⅳ類，同時(shí)將邊坡結(jié)構(gòu)面分為Ⅱ、Ⅲ、Ⅳ類結(jié)構(gòu)面，對其形狀特征進(jìn)行了詳細(xì)的描述。詳細(xì)闡述了研究區(qū)的巖體變形特征，并分析了其成因機(jī)制。 通過上述的工程地質(zhì)分析，詳細(xì)分析了可能失穩(wěn)的不利塊體的組合模式，并且采用Slide軟件，利用極限平衡法分析了各不利組合模式的穩(wěn)定性，給出了具體的安全系數(shù)。計(jì)算結(jié)果表明：以斷層面Fs-1為后緣拉裂面，巖層層面為底滑面的滑動模式和以斷層面fs-2為后緣拉裂面，巖層層面為底滑面的滑動模式穩(wěn)定性最差。 采用UDEC軟件對邊坡變形破壞的動態(tài)過程進(jìn)行數(shù)值模擬，分別從應(yīng)力、應(yīng)變、位移、塑性區(qū)分布等方面分析邊坡在不同階段的變形特征，模擬邊坡在不加固的情況下開挖的動態(tài)破壞過程。最后分析了邊坡在邊開挖邊加固的工況下不同開挖階段的變形特征，根據(jù)計(jì)算結(jié)果判斷邊坡需要進(jìn)一步加固，，給出加固方案：在原始加固方案的基礎(chǔ)上，進(jìn)行開挖第五級邊坡的加固。
[Abstract]:In order to establish a solid material foundation for the great rejuvenation of the Chinese nation, since the beginning of the new century, our governments at all levels have stepped up the development of hydropower projects, and in the process of construction of hydropower stations, All kinds of slope stability problems and treatment become not to be ignored. Because of the special landform between Sichuan and Tibet, high cliffs and steep walls, deep valleys all over, it is very important to evaluate the stability of all kinds of natural slopes and engineering slopes, and to analyze the failure mode and failure process. The inlet slope of diversion tunnel in monkey rock hydropower station is one of these slopes. Since the diversion tunnel will be transformed into a flood discharge tunnel after the diversion effect is completed, it is not a temporary project, so the stability of the diversion tunnel slope is very important to the normal operation of the whole project. Taking the inlet slope of diversion tunnel on the left bank of Xianyan Hydropower Station as the main research object, on the basis of investigation, collection and analysis of the regional geographical environment conditions, stratigraphic lithology, geological structure and hydrogeology in the dam site area, The stratigraphic lithology, geological structure and hydrogeology of the diversion tunnel slope are emphatically analyzed, and the rock mass structure characteristics, including rock characteristics, structural plane characteristics and shape of the inlet slope of the diversion tunnel are analyzed in depth. On the basis of these works, the possible failure mode and potential sliding surface after slope excavation are analyzed. In this paper, the safety factor of potential sliding surface is calculated by using rigid body limit equilibrium method and Slide software. The discrete element software UDEC is used to simulate the deformation of natural slope, the dynamic process of excavation failure and the analysis of post-support deformation. Finally, suggestions for improvement of support are given by using the calculation results. The concrete contents are as follows: combined with the field geological survey data, the rock mass structure characteristics of the inlet slope of diversion tunnel in the Monaoyan Hydropower Station are summarized comprehensively, and the geological model is established preliminarily. The rock mass quality of slope is divided into 鈪

本文編號：2179670