本文選題：膨脹土-換填土渠坡 + 降雨滲流　； 參考：《河北工程大學》2014年碩士論文

【摘要】：本文以南水北調(diào)中線工程河北省渠道邯鄲-邢臺段邊坡工程實踐為依托，對膨脹土的工程特性和邊坡穩(wěn)定性進行了分析研究。文章介紹了膨脹土在國內(nèi)外的研究現(xiàn)狀、膨脹土的特征、工程特性，分析了膨脹土邊坡的破壞機理及對工程建筑物的危害。 文章以南水北調(diào)中線工程膨脹土-換填土渠坡為背景，分別采用理論計算、實驗研究和FLAC-SLOPE軟件模擬，分析其在超載及滲流條件下穩(wěn)定性。膨脹土-換填土渠坡的計算工況分為三種，分別是渠內(nèi)無水時、渠內(nèi)水深為設計水深的1/3時及渠內(nèi)水深為加大水深的1/3時。 其中，理論計算部分主要采用極限平衡理論來研究膨脹土邊坡各工況下的穩(wěn)定問題,參考條分法等極限平衡理論，對比分析了膨脹土邊坡在超載、無荷載兩種情況下的穩(wěn)定性問題。介紹了邯鄲-邢臺段的工程特點、水文和地質(zhì)條件，對膨脹土-換填土渠坡進行了滲流分析和穩(wěn)定分析，并對計算結果做了綜合分析，得出了膨脹土-換填土渠坡的破壞形態(tài)及最可能出現(xiàn)的滑動失穩(wěn)形式。 實驗部分介紹了該實驗的設計思路與原理，并根據(jù)幾何相似、失穩(wěn)臨界狀態(tài)相似條件，建立了膨脹土-換填土渠坡的實驗模型。通過在渠坡坡頂施加外荷載(超載)，使其達到極限平衡狀態(tài)，來考察渠坡失穩(wěn)形態(tài)。通過實驗發(fā)現(xiàn)，膨脹土-換填土在超載和滲流作用下，從裂隙發(fā)育至發(fā)生顯著大變形失穩(wěn)，有一個緩慢發(fā)展的過程，且渠坡失穩(wěn)大變形區(qū)域發(fā)生于膨脹土淺表范圍內(nèi)。 軟件分析部分主要介紹了FLAC軟件的應用范圍，重點介紹了FLAC-slope軟件的特點、方法和應用原理。運用FLAC-slope軟件模擬了膨脹土-換填土渠坡在超載及降雨滲流影響時，三種工況下的穩(wěn)定問題。通過模擬的結果可看出膨脹土-換填土渠坡的破壞形式。 最后，，綜合分析理論計算與軟件模擬，可得出在堤頂超載及地下滲流影響下的膨脹土-換填土渠坡失穩(wěn)最危險滑裂面是含有塊間破裂面的復合曲面形式或單一曲面形式，并進一步通過實驗驗證了這一規(guī)律。
[Abstract]:Based on the engineering practice of Handan-Xingtai section in Hebei Province, the engineering characteristics and slope stability of expansive soil are analyzed and studied in this paper. This paper introduces the research status, characteristics and engineering characteristics of expansive soil at home and abroad, and analyzes the failure mechanism of expansive soil slope and its harm to engineering buildings. Based on the expansive soil-fill channel slope of the middle route project of South-to-North Water transfer Project, theoretical calculation, experimental study and simulation of FLAC-SLOPE software are used to analyze its stability under overload and seepage conditions. When there is no water in the channel, the depth of water in the channel is 1 / 3 of the designed water depth and the water depth in the canal is one third of that of the increase in the water depth. In the theoretical calculation part, the limit equilibrium theory is mainly used to study the stability of expansive soil slope under various working conditions. Referring to the limit equilibrium theory such as the strip method, the overloading of expansive soil slope is compared and analyzed. Stability problem in two cases without load. The engineering characteristics, hydrological and geological conditions of Handan-Xingtai section are introduced. Seepage analysis and stability analysis of expansive soil-fill canal slope are carried out, and the calculation results are analyzed synthetically. The failure pattern and the most likely sliding instability of expansive soil-fill channel slope are obtained. In the experiment part, the design idea and principle of the experiment are introduced, and the experimental model of expansive soil-replacement canal slope is established according to the similar condition of geometric similarity and unstable critical state. By applying external load (overload) on the top of the canal slope to reach the ultimate equilibrium state, the unstable state of the channel slope is investigated. It is found that under the action of overloading and seepage, the expansive soil-replacement fill has a slow development process from the development of cracks to the occurrence of significant large deformation and instability, and the large deformation region of channel slope instability occurs in the shallow range of expansive soil. In the part of software analysis, the application scope of FLAC software is introduced, and the characteristics, methods and application principle of FLAC-slope software are emphatically introduced. FLAC-Slope software is used to simulate the stability of expansive soil-replacement canal slope under the influence of overloading and rainfall seepage. According to the simulation results, the failure form of expansive soil-fill canal slope can be seen. Finally, by synthesizing theoretical calculation and software simulation, it can be concluded that the most dangerous sliding surface of expansive soil-fill canal slope under the influence of overloading on the top of embankment and underground seepage is a composite surface or a single surface with interblock fracture surface. This rule is further verified by experiments.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV68;TV672

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