本文選題：昆明新機(jī)場(chǎng) + 高填方邊坡��； 參考：《成都理工大學(xué)》2013年碩士論文

【摘要】：西南地區(qū)地形地貌復(fù)雜，地勢(shì)起伏較大，而機(jī)場(chǎng)建設(shè)占地面積大，跨越的地質(zhì)單元多，機(jī)場(chǎng)的建設(shè)勢(shì)必會(huì)產(chǎn)生深挖高填。填方形成的高邊坡的穩(wěn)定性與否直接影響到工程的設(shè)計(jì)、施工、運(yùn)行，甚至于機(jī)場(chǎng)建設(shè)的可行性。所以高填方邊坡穩(wěn)定性是西南地區(qū)機(jī)場(chǎng)工程建設(shè)所要解決的重點(diǎn)問(wèn)題之一。 本文以昆明新機(jī)場(chǎng)西跑道北端高填方邊坡為研究對(duì)象。場(chǎng)區(qū)原始地形極其復(fù)雜，地處東西兩側(cè)山峰形成的谷底地帶，谷底標(biāo)高1900～2000m，四周山峰海拔高度2200～2800m，西北和東南側(cè)是標(biāo)高2100m以上、呈南北走向的連續(xù)山體，中部有東北向連續(xù)山體穿過(guò)整個(gè)場(chǎng)區(qū)，整個(gè)場(chǎng)區(qū)地勢(shì)起伏較大，中部高、兩端低。研究區(qū)最大填方高度達(dá)50多米，并且高填方下原地基存在相對(duì)軟弱層，使高填方邊坡穩(wěn)定性問(wèn)題更加突出。 本文主要從填方體自身荷載作用下原地基軟弱巖層變形影響、降雨入滲影響、地震動(dòng)力影響三個(gè)誘發(fā)高填方邊坡失穩(wěn)的主要因素出發(fā)，深入研究高填方邊坡的失穩(wěn)規(guī)律。通過(guò)野外實(shí)地勘察，并結(jié)合研究區(qū)工程地質(zhì)初勘和詳勘資料，簡(jiǎn)要的概括和分析了研究區(qū)自然地理和工程地質(zhì)條件。選取研究區(qū)高填方區(qū)域兩條典型的邊坡剖面從3個(gè)方面進(jìn)行分析：（1）利用有限元分析填方體在自身荷載作用下邊坡的變形破壞模式。（2）基于飽和-非飽和土力學(xué)理論，運(yùn)用Geo-studio/seep軟件建立滲流有限元模型，，考慮非飽和土邊坡從雨水入滲到出現(xiàn)失穩(wěn)的全過(guò)程，計(jì)算給定降雨條件下高填方邊坡地下水位線位置的變化規(guī)律、邊坡土體內(nèi)孔隙水壓力的分布規(guī)律等情況，探求滲流場(chǎng)的變化規(guī)律，同時(shí)將Geo-studio/seep計(jì)算所得水位線導(dǎo)入Geo-studio/slope模塊計(jì)算和分析高填方邊坡穩(wěn)定性。（3）運(yùn)用Geostudio/quake數(shù)值模擬軟件，以研究區(qū)高填方邊坡的地質(zhì)模型為基本依據(jù)，按照有限元的建模原則，建立有限元計(jì)算模型，基于地震動(dòng)力時(shí)程分析法進(jìn)行地震工況下的數(shù)值模擬，模擬邊坡在地震荷載作用下的應(yīng)力場(chǎng)、形變場(chǎng)以及重要部位應(yīng)力、變形在地震過(guò)程中隨時(shí)間的演化狀況，分析其在地震荷載作用下的潛在滑裂面并分析評(píng)價(jià)邊坡穩(wěn)定性；運(yùn)用Flac3D軟件分析計(jì)算邊坡各重點(diǎn)部位在地震作用下高填方邊坡的應(yīng)力分布規(guī)律和變形規(guī)律，運(yùn)用摩爾－庫(kù)侖屈服準(zhǔn)則，圈出邊坡的塑性破壞區(qū)。最后綜合分析高填方邊坡的穩(wěn)定性并提出相應(yīng)的工程處理措施建議。
[Abstract]:The topography and geomorphology of southwest area are complicated and the topography is large, but the airport construction occupies a large area and spans many geological units, so the construction of the airport is bound to produce deep excavation and high fill. The stability of high slope formed by fill directly affects the feasibility of engineering design, construction, operation and even airport construction. So the stability of high-fill slope is one of the key problems to be solved in the airport construction in Southwest China. This paper takes the high fill slope at the north end of the west runway of Kunming New Airport as the research object. The original terrain of the field area is extremely complex. It is located in the valley bottom zone formed by the peaks on both sides of the east and west, the valley bottom elevation is 1900 ~ 2000m, the elevation of the surrounding peaks is 2200 ~ 2800m, and the northwest and southeast sides are continuous mountains with a elevation of above 2100m and a north-south trend. In the middle there is a continuous northeast mountain body passing through the whole field area, the whole field topography is large, the middle part is high, and the two ends are low. The maximum fill height of the study area is more than 50 meters, and there are relatively weak layers in the original foundation under the high fill, which makes the stability problem of the high fill slope more prominent. In this paper, the instability law of high fill slope is studied based on the three main factors, I. e., deformation of soft rock, rainfall infiltration and seismic dynamics, which induce instability of high fill slope. Based on field investigation and combined with the preliminary and detailed data of engineering geology in the study area, the natural geography and engineering geological conditions of the study area are summarized and analyzed briefly. In this paper, two typical slope sections in the high fill area of the study area are selected to analyze the slope deformation and failure mode of the embankment under its own load from three aspects. The finite element method is used to analyze the deformation and failure mode of the slope under its own load.) based on the theory of saturated-unsaturated soil mechanics, the deformation and failure mode of the slope is analyzed. The seepage finite element model is established by using Geo-studio/seep software. Considering the whole process from Rain Water infiltration to instability of unsaturated soil slope, the variation law of underground water level of high fill slope under given rainfall condition is calculated. The distribution law of pore water pressure in slope soil is studied to find out the variation law of seepage field. At the same time, the water level line calculated by Geo-studio/seep is introduced into Geo-studio/slope module to calculate and analyze the stability of high fill slope. Geostudio/quake numerical simulation software is used to calculate and analyze the stability of high fill slope. Based on the geological model of high fill slope in the study area, the finite element calculation model is established according to the principle of finite element modeling, and the numerical simulation under earthquake condition is carried out on the basis of seismic dynamic time history analysis. The stress field, deformation field and stress of important part of slope under earthquake load are simulated, and the evolution of deformation with time during earthquake is simulated. The potential slip surface under earthquake load is analyzed and the slope stability is evaluated. The stress distribution law and deformation law of high fill slope under earthquake action are analyzed and calculated by Flac3D software, and the plastic failure zone of slope is circumscribed by Mohr Coulomb yield criterion. Finally, the stability of high-fill slope is analyzed synthetically and the corresponding engineering treatment measures are put forward.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU43

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