本文選題：有限元強度折減法 + 抗滑樁　； 參考：《大連理工大學》2013年碩士論文

【摘要】：邊坡穩(wěn)定性評價和滑坡治理工程問題具有悠久的研究歷史,但是由于其復雜性,邊坡相關問題目前仍是學術人員和工程人員的熱點話題�？够瑯妒悄壳白畛Ｓ玫倪吰录庸檀胧┲�,但是有關抗滑樁的理論和計算方法卻不夠成熟,仍有部分問題沒形成統(tǒng)一而明確的認識。為探究抗滑樁對邊坡穩(wěn)定性和破壞模式的影響以及抗滑樁自身的位移和內力反應,深入揭示抗滑樁-巖土體-邊坡之間的相互作用關系,為理論研究和工程實踐提供可信的參考,本文采用經典數值算例和實際工程案例,以有限元強度折減法為手段,開展了如下研究工作： 采用多個算例,討論簡單均質邊坡中無量綱參數λ=c/(γHtanφ)與邊坡的安全系數和臨界滑動面之間的關系,利用這個重要的規(guī)律,建立了基于強度折減有限元法的簡單均質邊坡強度參數反演分析方法。對某工程中的高填方邊坡進行擬靜力穩(wěn)定性分析,探討不同的地基處理方式(碎石樁和強夯置換)對邊坡穩(wěn)定性和破壞模式的影響。 采用單排抗滑樁加固邊坡,深入分析了加固效果和破壞模式、樁身的位移和內力反應以及沿著樁身的土壓力分布情況；考慮四種不同的樁頭約束情況(自由、不旋轉、鉸接和固定),分析其穩(wěn)定性安全系數和臨界滑動面的差異,探討樁的變形和受力形式及峰值大小,并從沿著樁身的土壓力分布情況來分析其原因；改變樁間距分別進行計算分析得到了單排樁加固邊坡的安全系數的上界和下界,并分析了樁間距對樁間土拱效應形成的影響；對樁的不同加固位置進行模擬分析,得到了單排樁的最佳加固位置。 采用雙排抗滑樁加固邊坡,基于等效樁架的概念提出了同單排樁等效的三種雙排樁布樁形式(常規(guī)雙排樁、錯列雙排樁和等效錯列雙排樁),并在不同的土體強度參數下從安全系數、樁身內力反應和土拱效應等方面討論了最佳布樁形式的問題；同單排樁一樣考慮了樁頭約束效應對雙排樁加固邊坡的影響,并對比了前排樁和后排樁的樁身反應的差異,驗證了陰影效應的存在；改變排距建模計算,分析了邊坡的安全系數和樁身的內力反應,探討排距對陰影效應的影響；選取不同的排距,考慮雙排樁的位置對加固效果和樁身內力反應的影響,同時分析了特殊情況(S/D=1)下的邊坡破壞模式受樁位的影響,從而探討雙排樁的最佳樁位問題。 以大連岔鞍滑坡為工程實例,分析了開挖削坡對邊坡穩(wěn)定性和破壞模式的影響；地下水會導致滑帶土強度參數的降低,探討了地下水水位的變化對邊坡整體穩(wěn)定性和局部路堤邊坡穩(wěn)定性及破壞模式的影響；采用單排樁加固于邊坡的中下部,分析了樁頭自由和鉸接兩種約束條件下的加固效果和臨界破壞面及樁身內力反應情況。
[Abstract]:Slope stability evaluation and landslide treatment engineering have a long history of research, but because of its complexity, slope related problems are still a hot topic for academicians and engineers. Anti-slide pile is one of the most commonly used slope reinforcement measures at present, but the theory and calculation method of anti-slide pile are not mature enough, there are still some problems have not formed a unified and clear understanding. In order to explore the influence of anti-slide pile on slope stability and failure mode, and the displacement and internal force response of anti-slide pile, the interaction between anti-slide pile and rock-soil-slope is revealed. For theoretical research and engineering practice to provide a credible reference, this paper uses classical numerical examples and practical engineering cases, using the finite element strength reduction method as the means, carried out the following research work: The relationship between the dimensionless parameter 位 Htan 蠁 (緯 Htan 蠁) and the safety factor and critical sliding surface of a simple homogeneous slope is discussed in this paper. A simple inversion analysis method for strength parameters of homogeneous slope based on strength reduction finite element method is established. The pseudostatic stability analysis of high fill slope in a certain project is carried out, and the influence of different foundation treatment methods (gravel pile and dynamic tamping replacement) on slope stability and failure mode is discussed. The single row anti-slide pile is used to reinforce the slope. The reinforcement effect and failure mode, the displacement and internal force response of the pile body and the distribution of the earth pressure along the pile body are analyzed in depth, and four different kinds of pile head constraints (free, non-rotating) are considered. The difference between the safety factor of stability and the critical sliding surface is analyzed, and the deformation, stress form and peak value of the pile are discussed, and the reasons are analyzed from the distribution of earth pressure along the pile body. The upper and lower boundaries of safety factor of single row pile reinforced slope are obtained by changing pile spacing, and the influence of pile spacing on the formation of soil arch effect between piles is analyzed, and the different reinforcement positions of piles are simulated and analyzed. The best reinforcement position of single row pile is obtained. Based on the concept of equivalent pile frame, three types of double-row piles (conventional double-row piles) are proposed for slope reinforcement with double-row anti-slide piles. Staggered double-row piles and equivalent staggered double-row piles are used to discuss the optimal layout of piles under different soil strength parameters, such as safety factor, pile internal force response and soil arch effect. Like single row pile, the influence of pile head constraint effect on reinforcement slope of double row pile is considered, and the difference of pile body response between front row pile and rear row pile is compared, the existence of shadow effect is verified, and the modeling calculation of changing row distance is made. The safety factor of the slope and the internal force response of the pile body are analyzed, and the influence of the row distance on the shadow effect is discussed, and the influence of the position of the double row pile on the reinforcement effect and the internal force response of the pile body is considered. At the same time, the influence of pile position on the failure mode of slope under special condition S / D ~ (1) is analyzed, and the optimum pile position of double row pile is discussed. The influence of excavation and slope cutting on the slope stability and failure mode is analyzed with the example of Dalian Chayan landslide, and the ground water will lead to the decrease of soil strength parameters in the slip zone. The influence of the change of groundwater level on the overall stability of the slope and the stability and failure mode of the local embankment slope is discussed, and the single row pile is used to reinforce the middle and lower part of the slope. The reinforcement effect and the reaction of the critical failure surface and the internal force of the pile body under the free and hinged conditions of pile head are analyzed.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU43

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