本文關(guān)鍵詞： 深基坑 樁錨支護 穩(wěn)定性 強度參數(shù)折減法 滑向應(yīng)力有限單元法　出處：《南京理工大學》2013年碩士論文　論文類型：學位論文

【摘要】：樁錨加上部土釘組合支護結(jié)構(gòu)是一種較新的支護體系,它已被較廣泛應(yīng)用于深基坑支護和邊坡防滑工程。這種支護結(jié)構(gòu)因為許多優(yōu)點而在實際中被廣泛采用。但是到目前為止,關(guān)于這類支護基坑的穩(wěn)定性的數(shù)值計算和應(yīng)用研究還很不夠。 基坑邊坡穩(wěn)定性分析對其設(shè)計和施工都是重要內(nèi)容。從理論和算法兩方面對穩(wěn)定性分析的傳統(tǒng)極限平衡法,抗剪強度參數(shù)折減有限元法和滑面應(yīng)力有限元分析法進行了對比,分析了極限平衡法的力學原理和不足,對抗剪強度參數(shù)折減有限元法和滑面應(yīng)力有限元分析法的特點和實施程序進行了分析探討,從理論上闡述了抗剪強度參數(shù)折減算法和滑面應(yīng)力有限元算法的可取性。 基于抗剪強度參數(shù)折減算法,采用PLAXIS程序?qū)σ簧喜吭O(shè)計為土釘,下部樁錨的復雜支護深基坑的滑動面和穩(wěn)定性安全系數(shù)進行了模擬和計算,結(jié)果顯示,兩種方法得到的安全系數(shù)存在一定差別,分析了產(chǎn)生差別的原因。認為主要原因是有限元模擬方法考慮了支護樁和錨索與土體之間的一定程度的相互作用,并且有限元采用的是上部土釘與下部樁錨整體化計算模型,而傳統(tǒng)極限平衡法不能很好地考慮支護結(jié)構(gòu)(樁和錨桿)與土體的相互作用。 有限元計算結(jié)果還顯示,上部土釘?shù)膬?nèi)力與土釘高度位置和其下樁錨支護段的施工挖土等有關(guān)。頂層土釘?shù)膬?nèi)力較小。每一層土釘?shù)膬?nèi)力顯示隨該土釘下面土層的開挖而累計變化,隨模擬開挖深度增加內(nèi)力增大。 抗剪強度參數(shù)折減有限元法和滑面應(yīng)力有限元分析方法的應(yīng)用,能為樁錨復雜支護基坑的設(shè)計和施工提供較好的指導。
[Abstract]:Pile anchor combined with soil nailing is a new support system. It has been widely used in deep foundation pit support and slope anti-slip engineering. This kind of support structure is widely used in practice because of many advantages. But so far. Numerical calculation and applied research on the stability of this kind of supporting foundation pit are not enough. The stability analysis of foundation pit slope is an important content for its design and construction. The traditional limit equilibrium method for stability analysis is presented in theory and algorithm. The shear strength parameter reduction finite element method and the sliding surface stress finite element analysis method are compared, and the mechanical principle and shortcomings of the limit equilibrium method are analyzed. The characteristics and implementation program of shear strength parameter reduction finite element method and sliding surface stress finite element analysis are analyzed and discussed. The desirability of shear strength parameter reduction algorithm and sliding surface stress finite element method are discussed theoretically. Based on the shear strength parameter reduction algorithm, PLAXIS program is used to simulate and calculate the sliding surface and stability safety factor of a complex retaining deep foundation pit with the upper part designed as soil nailing and the lower pile anchor. The results show that there are some differences in the safety coefficient between the two methods. It is considered that the main reason is that the finite element simulation method takes into account the interaction between supporting pile and anchor cable and soil to a certain extent. The finite element method adopts the integral calculation model of the upper soil nailing and the lower pile anchor, but the traditional limit equilibrium method can not take into account the interaction between the supporting structure (pile and anchor) and soil. The finite element results also show that. The internal force of the upper soil nailing is related to the height of the soil nailing and the construction and excavation of the supporting section under the pile and anchor. The internal force of the top soil nailing is relatively small. The internal force of each layer of soil nailing shows that the internal force varies with the excavation of the soil layer below the soil nailing. The internal force increases with the increase of simulated excavation depth. The application of shear strength parameter reduction finite element method and sliding surface stress finite element analysis method can provide better guidance for the design and construction of pile-anchor complex supporting foundation pit.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU470

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