本文選題：高填方邊坡 + 紅黏土地基��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著我國(guó)西南地區(qū)基礎(chǔ)設(shè)施建設(shè)的快速發(fā)展,機(jī)場(chǎng)、公路、鐵路等項(xiàng)目的建設(shè)帶來(lái)的高填方邊坡日益增多,加上西南地區(qū)地質(zhì)條件極為復(fù)雜,因此對(duì)高填方邊坡變形和穩(wěn)定性的研究變得至關(guān)重要,不僅關(guān)系到工程建設(shè)能否順利完成,而且直接影響建設(shè)場(chǎng)地日后的正常使用。西南地區(qū)廣泛分布紅黏土,紅黏土作為一種特殊性地基土,對(duì)上覆填方邊坡的變形和穩(wěn)定性有重要影響,因此對(duì)于紅黏土作為邊坡基底的研究也顯得至關(guān)重要。本文以云南安寧地付罐區(qū)高填方邊坡為研究對(duì)象,綜合多種方法研究該紅黏土基底高填方邊坡的變形和穩(wěn)定性,對(duì)同類型的工程有一定的指導(dǎo)意義。論文主要工作內(nèi)容如下:(1)根據(jù)收集的勘察、設(shè)計(jì)和施工資料,掌握并概述研究區(qū)的地形地貌、地質(zhì)構(gòu)造、地層結(jié)構(gòu)、水文地質(zhì)等,同時(shí)也分析了施工技術(shù)參數(shù)和變形特征。(2)根據(jù)收集的勘察資料,概述了研究區(qū)巖土體的結(jié)構(gòu)特性及其物理力學(xué)性質(zhì)。通過(guò)分析三個(gè)階段的室內(nèi)土工試驗(yàn)數(shù)據(jù),結(jié)合原位測(cè)試手段,研究分析了填方施工前后,下覆軟弱土層紅黏土的物理力學(xué)性質(zhì)的變化,同時(shí)通過(guò)surfer軟件依據(jù)收集的鉆孔資料分析得到了填土和紅黏土的分布特征。(3)利用GEO-SLOPE軟件SIGMA模塊和有限差分軟件FLAC3D分別從二維和三維對(duì)填方邊坡的施工過(guò)程進(jìn)行模擬計(jì)算,分析填方邊坡的位移變化和拉應(yīng)力分布。然后根據(jù)數(shù)值模擬結(jié)果,分析地付罐區(qū)裂縫產(chǎn)生的原因,及其與基底紅黏土的相關(guān)性。(4)根據(jù)工后坡體地表監(jiān)測(cè)數(shù)據(jù),結(jié)合類似工程變形,分析和預(yù)測(cè)坡體的變形趨勢(shì),并且通過(guò)兩者來(lái)對(duì)比數(shù)值模擬的結(jié)果,從而驗(yàn)證數(shù)值模擬的有效性。(5)利用SLIDE軟件基于簡(jiǎn)化BISHOP法對(duì)四個(gè)典型剖面進(jìn)行一般工況和地震工況的穩(wěn)定性計(jì)算,同時(shí)為了分析裂縫形成原因及對(duì)罐區(qū)東側(cè)整個(gè)坡體的穩(wěn)定性的影響,假定滑動(dòng)面后緣位置為裂縫區(qū)域,再次利用SLIDE軟件進(jìn)行穩(wěn)定性計(jì)算。然后利用FLAC3D軟件基于強(qiáng)度折減法對(duì)邊坡進(jìn)行折減計(jì)算,得到相應(yīng)的安全系數(shù),并與SLIDE軟件計(jì)算結(jié)果比較。最后采用《公路工程抗震規(guī)范》中的計(jì)算公式驗(yàn)證SLIDE軟件計(jì)算的地震工況下最危險(xiǎn)剖面的穩(wěn)定性。(6)結(jié)合多種方法對(duì)高填方邊坡的分析計(jì)算結(jié)果,綜合評(píng)估填方邊坡的穩(wěn)定性。同時(shí)根據(jù)之前的工作,研究分析紅黏土基底對(duì)整個(gè)填方邊坡變形及穩(wěn)定性的影響,以及與坡體裂縫產(chǎn)生的關(guān)系。
[Abstract]:With the rapid development of infrastructure construction in southwest China, the construction of airports, highways, railways and other projects has resulted in an increasing number of high fill slopes, and the geological conditions in southwest China are extremely complex. Therefore, the study of deformation and stability of high fill slope becomes very important, which not only relates to the successful completion of engineering construction, but also directly affects the normal use of construction site in the future. Red clay is widely distributed in southwest China. As a special foundation soil, red clay has an important effect on the deformation and stability of overlying fill slope, so it is very important to study red clay as the base of slope. In this paper, the deformation and stability of the high fill slope of the red clay foundation are studied by taking the high fill slope of Anning Tiefu area in Yunnan Province as the research object, which has certain guiding significance for the same type of project. The main work of the paper is as follows: (1) based on the collected survey, design and construction data, the topographical features, geological structure, stratigraphic structure, hydrogeology and so on of the study area are mastered and summarized. At the same time, the construction technical parameters and deformation characteristics are analyzed. (2) based on the survey data collected, the structural characteristics and physical and mechanical properties of rock and soil in the study area are summarized. The physical and mechanical properties of red clay overlying soft soil layer before and after filling construction were studied and analyzed by analyzing the data of three stages of indoor geotechnical test and in situ testing. At the same time, based on the analysis of borehole data collected by surfer software, the distribution characteristics of fill and red clay are obtained. The construction process of filling slope is simulated by GEO-SLOPE software SIGMA module and finite difference software FLAC3D from 2D and 3D, respectively. The displacement variation and tensile stress distribution of fill slope are analyzed. Then, according to the results of numerical simulation, the causes of cracks and their correlation with red clay are analyzed, and the deformation trend of slope is analyzed and forecasted according to the surface monitoring data of post-construction slope and similar engineering deformation. The results of numerical simulation are compared with each other to verify the validity of numerical simulation. (5) using SLIDE software to calculate the stability of four typical sections under general and seismic conditions based on simplified BISHOP method. At the same time, in order to analyze the cause of crack formation and the influence on the stability of the whole slope body in the east side of the tank area, it is assumed that the position of the back edge of the sliding surface is the crack area, and the stability calculation is carried out again by using SLIDE software. Then the slope is reduced by FLAC3D software based on the strength reduction method, and the corresponding safety factor is obtained, and the calculated results are compared with those of the SLIDE software. Finally, the stability of the most dangerous section under seismic condition calculated by SLIDE software is verified by the calculation formula in "Code for earthquake Resistance of Highway Engineering". The stability of the slope is evaluated synthetically by combining the results of analysis and calculation of high fill slope with various methods. At the same time, according to the previous work, the influence of red clay base on the deformation and stability of the whole fill slope and the relationship between the red clay base and the cracks in the slope body are studied and analyzed.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU446

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