本文選題：拓寬路基　切入點：強度折減法　出處：《重慶交通大學》2014年碩士論文

【摘要】：本文針對目前拓寬路基過程中需要不封路的施工要求,基于常用的路基邊坡穩(wěn)定性分析中的強度折減法,對此種特殊工程狀況的邊坡進行了有限元分析。 為了準確掌握實際工程中的斷面幾何形態(tài)以及土質(zhì)力學強度因素對不封路狀態(tài)拓寬路基邊坡施工穩(wěn)定性的影響,通過現(xiàn)場調(diào)研選擇有代表性的土樣進行室內(nèi)試驗,測試土樣的物理力學特性,并且以試驗結果為建�；A,研究建立了ABAQUS的強度折減法邊坡穩(wěn)定模型,同時在此基礎上對斷面幾何參數(shù)、材料力學指標和模型計算參數(shù)進行影響分析；根據(jù)模型計算結果,提出了兩種邊坡穩(wěn)定防護方法,從理論上上對整個施工過程做出了詳細的數(shù)值分析。 結果表明： (1)利用強度折減法建立的邊坡穩(wěn)定分析模型可以很好的表達這種特殊的施工模式,分析過程中以斜坡內(nèi)某點的位移與折減系數(shù)的關系曲線的突變點作為判別準則； (2)對于本模型中,路基的填土高度不宜過高,且邊坡坡率以1：1.5以上為宜；且開挖過程中臺階數(shù)量增多,安全系數(shù)逐漸增大,多級開挖可以保證施工更加安全；路基土的C,φ以及剪脹角會顯著影響邊坡安全穩(wěn)定系數(shù),而土基的C、剪脹角基本不會影響,φ會影響安全系數(shù),但是影響程度小于路基土。無論是路基土還是土基,回彈模量對邊坡穩(wěn)定性的影響都極��；壓路機荷載是一個重要的影響因素,且當荷載達到最大的4500KN時,安全穩(wěn)定系數(shù)急劇下降,邊坡失穩(wěn)破壞。 (3)土工格柵和換填處治土均是兩種經(jīng)濟、實用的邊坡防護方法。設置了土工格柵后,安全系數(shù)提高兩倍,說明土工格柵能給予較大的承力支持；而換填處治土后安全穩(wěn)定系數(shù)增長了38.2%,說明換填法對于邊坡穩(wěn)定性的提高有十分重要的作用。
[Abstract]:In view of the construction requirement of not sealing the road in the process of widening the roadbed at present, based on the strength reduction method commonly used in the stability analysis of subgrade slope, the finite element analysis of the slope with this special engineering condition is carried out in this paper.In order to accurately understand the influence of section geometry and soil mechanical strength factors on the stability of roadbed slope construction without road closure, the representative soil samples are selected for indoor test through field investigation.On the basis of testing the physical and mechanical properties of the soil samples, and based on the experimental results, the stability model of ABAQUS's strength reduction slope is established, and the geometric parameters of the section are also analyzed.According to the results of model calculation, two methods of slope stability protection are put forward, and the detailed numerical analysis of the whole construction process is made theoretically.The results show that:1) the slope stability analysis model established by the strength reduction method can well express this special construction mode. In the process of analysis, the catastrophe point of the curve between the displacement and the reduction coefficient of a certain point in the slope is taken as the criterion;2) for this model, the filling height of roadbed should not be too high, and the slope ratio of side slope should be above 1: 1.5, and the number of steps increases and the safety factor increases gradually during the excavation process, and the multi-stage excavation can ensure the construction to be safer.The C, 蠁 and the angle of shear expansion of subgrade soil will significantly affect the coefficient of slope safety stability, but the C and the angle of expansion of soil foundation will not affect the safety factor, 蠁 will affect the safety factor, but the influence degree is smaller than that of subgrade soil.Whether subgrade soil or soil foundation, the modulus of resilience has very little influence on slope stability, and the load of roller is an important factor, and when the load reaches the maximum 4500KN, the coefficient of safety stability decreases sharply and the slope loses stability.Geogrid and soil replacement are two economic and practical slope protection methods.After the geogrid is set up, the safety factor is increased by two times, which indicates that the geogrid can give greater support to the force, while the coefficient of safety and stability increases by 38.2% after the replacement of the soil, which indicates that the replacement method plays a very important role in the improvement of slope stability.
【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.14

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