本文選題：高填方 + 邊坡�。� 參考：《蘭州理工大學(xué)》2017年碩士論文

【摘要】：隨著我國社會經(jīng)濟的高速發(fā)展和國家對城市化進程的大力推進,西部地區(qū)基礎(chǔ)設(shè)施建設(shè)獲得空前的發(fā)展機遇。但是受到西部特殊的地質(zhì)環(huán)境和獨有的地形地貌條件的限制,不可避免的會遇到很多高填深挖工程,由此產(chǎn)生了大量的高填方邊坡穩(wěn)定性問題。相對于以往的填方邊坡工程而言,當前高填方邊坡變形及破壞機制日益復(fù)雜;特別是,不同降雨條件下高填方邊坡穩(wěn)定性研究匱乏,進而導(dǎo)致的高填方變形過大或失穩(wěn)事故時有發(fā)生,如何在既有成果的基礎(chǔ)上,提高高填方邊坡穩(wěn)定性分析的準確性,成為眾多科技工作者亟待探索研究的關(guān)鍵問題。本文依托隴南成州民用機場項目,首先,通過非飽和土三軸試驗進行了不同配合比填料的土水特征曲線實驗研究,以此對其相對滲透系數(shù)進行了預(yù)測;其次,基于高填方邊坡穩(wěn)定性分析方法的系統(tǒng)分析,討論了常用邊坡穩(wěn)定性分析方法的優(yōu)缺點及適用條件;第三,采用Plaxis和GEOstudio軟件對不同降雨條件下高填方邊坡穩(wěn)定性進行了深入分析,取得了一些有益成果和認識。具體研究內(nèi)容和成果如下:1.通過對本項目特點與難點分析,進行了非飽和土三軸實驗及其他室內(nèi)土工實驗,確定了不同配合比狀態(tài)下邊坡填料的抗剪強度、土水特征曲線、滲透系數(shù)等,為計算分析提供了準確參數(shù)�；趯嶒灚@取的土水特征曲線對不同吸力下的混合填料相對滲透系數(shù)進行合理預(yù)測;2.對于不同配合比的填料,在吸力較低水平下,配合比對滲透性影響不夠明顯;但是隨著吸力的增加,土體飽和度不斷減小,土石比為2:8的填料滲透系數(shù)衰減速度明顯大于土石比4:6的填料;在飽和過程的后期,這種差異逐漸減小;3.通過有限元軟件建立高填方邊坡數(shù)值分析模型,分析了自然工況條件下,不同填料、不同坡率和不同坡高的邊坡穩(wěn)定性。結(jié)果表明填料土石比為4:6的邊坡穩(wěn)定性較高;同時,隨著坡率和坡高的增大,邊坡安全系數(shù)逐漸減小,此外,上部邊坡坡率變化對整體穩(wěn)定性影響較大。4.分析了最大降雨、不同降雨強度、不同降雨歷時和前期降雨等條件下的高填方邊坡穩(wěn)定性,發(fā)現(xiàn)邊坡在歷史最大降雨條件下,表現(xiàn)出良好的穩(wěn)定性能;隨著降雨強度的增大,前期邊坡穩(wěn)定性迅速下降時間節(jié)點前移;隨著降雨持續(xù)時間的增加,安全系數(shù)呈現(xiàn)三階段的變化形式,即先緩慢降低,再急劇減小,最后趨于穩(wěn)定。
[Abstract]:With the rapid development of China's social economy and the great efforts of the country to promote the process of urbanization, the construction of infrastructure in the western region has obtained unprecedented opportunities for development. However, due to the limitation of the special geological environment and the unique terrain and geomorphology in the west of China, many high fill and deep excavation projects will inevitably be encountered, resulting in a large number of stability problems of the high fill slope. Compared with the previous fill slope engineering, the deformation and failure mechanism of the high fill slope is becoming more and more complicated, especially, the research on the stability of the high fill slope under different rainfall conditions is scarce. As a result of excessive deformation or instability accidents of high fill slope, how to improve the accuracy of slope stability analysis on the basis of existing achievements has become a key problem for many scientific and technological workers to explore and study. In this paper, based on Longnan Chengzhou civil airport project, first of all, through the unsaturated soil triaxial test, the soil and water characteristic curve of different mix ratio fillers were studied, and the relative permeability coefficient was predicted. Based on the systematic analysis of high fill slope stability analysis method, the advantages and disadvantages of common slope stability analysis methods and their applicable conditions are discussed. The stability of high fill slope under different rainfall conditions was analyzed by Plaxis and GEOstudio software, and some useful results and understanding were obtained. The specific research contents and results are as follows: 1. Based on the analysis of the characteristics and difficulties of the project, the triaxial experiments of unsaturated soil and other indoor geotechnical experiments are carried out, and the shear strength, soil-water characteristic curve, permeability coefficient and so on of the slope fillers under different mixing ratios are determined. It provides accurate parameters for calculation and analysis. Based on the characteristic curves of soil and water obtained by experiments, the relative permeability coefficient of mixed fillers under different suction was reasonably predicted. For the fillers with different mix ratio, the influence of mix ratio on permeability is not obvious at the lower suction level, but with the increase of suction, the saturation of soil decreases continuously. The attenuation rate of the permeability coefficient of the fillers with the earth-rock ratio of 2:8 is obviously higher than that of the fillers with the ratio of soil to rock 4:6, and the difference decreases gradually during the latter stage of the saturation process. The numerical analysis model of high fill slope was established by finite element software, and the slope stability of different fillers, different slope ratio and different slope height was analyzed under natural working conditions. The results show that the slope stability is higher when the ratio of soil to rock is 4:6, and the slope safety coefficient decreases gradually with the increase of slope ratio and slope height. In addition, the slope ratio of the upper side has a great influence on the overall stability. The stability of high fill slope under the conditions of maximum rainfall, different rainfall intensity, different rainfall duration and previous rainfall is analyzed. It is found that the slope shows good stability under the condition of historical maximum rainfall, and with the increase of rainfall intensity, With the increase of rainfall duration, the safety factor presents a three-stage change form, that is, the slope stability decreases slowly, then decreases sharply, and then tends to be stable.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU43

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