本文選題：邊坡 + 預(yù)應(yīng)力錨索　； 參考：《北京交通大學(xué)》2015年碩士論文

【摘要】：邊坡穩(wěn)定分析問題是巖土工程中一個重要的研究領(lǐng)域。目前,對邊坡穩(wěn)定分析主要采用二維的剛體極限平衡法,其計算簡單、物理意義明確,在工程界被廣泛使用。然而實際的邊坡穩(wěn)定分析是一個三維問題,應(yīng)采用三維穩(wěn)定分析方法進(jìn)行研究。另外,工程中對于安全儲備偏低的邊坡常采用一些加固措施,其中預(yù)應(yīng)力錨索因其加固效果較明顯,被廣泛應(yīng)用于邊坡的加固特別是巖質(zhì)邊坡中。在加錨邊坡的二維穩(wěn)定分析中,對于錨索的處理主要是將其簡化為一個單位寬度上的錨固力進(jìn)行計算,而在實際工程中錨索的布置一般呈三維特征,因此,這種簡化處理無法反應(yīng)實際情況。在加錨邊坡的穩(wěn)定分析中,有必要研究考慮預(yù)應(yīng)力錨索三維特性的三維極限分析方法。本文基于此提出了改進(jìn)的考慮預(yù)應(yīng)力錨索三維特性的三維極限分析方法,并進(jìn)行了相關(guān)討論和工程應(yīng)用。主要工作如下： (1)回顧和總結(jié)了近年來有關(guān)學(xué)者在邊坡三維極限平衡分析領(lǐng)域所做的工作,對各種分析方法的適用性和優(yōu)缺點進(jìn)行了簡單的探討； (2)介紹了課題組近年來提出的邊坡三維極限分析法的基本理論及計算方法,并在此基礎(chǔ)上進(jìn)行了改進(jìn),提出了考慮預(yù)應(yīng)力錨索三維特性的三維極限平衡和極限分析上限解法,并推導(dǎo)了相關(guān)計算公式。 (3)以小灣左岸壩前堆積體加固工程為例,設(shè)計了不同的錨索布置方案,對本文提出的考慮預(yù)應(yīng)力錨索的三維極限分析法進(jìn)行了驗證,并討論了預(yù)應(yīng)力錨索的三維加固效應(yīng)。 (4)采用二維剛體極限平衡、三維剛體極限平衡和F1ac3D有限差分法對湖南涔天河霧江滑坡在老水庫正常蓄水位254m工況和水庫擴(kuò)建后正常蓄水位313m工況進(jìn)行了綜合分析,對擴(kuò)建后正常蓄水位313m工況提出了采用預(yù)應(yīng)力錨索的加固方案。采用考慮預(yù)應(yīng)力錨索的三維極限分析法對加固方案進(jìn)行了評價,同時采用F1aC3D有限差分法對加錨前后邊坡的變形、穩(wěn)定性做了進(jìn)一步分析。結(jié)果表明,采用預(yù)應(yīng)力錨索對霧江滑坡起到明顯的加固作用。
[Abstract]:Slope stability analysis is an important research field in geotechnical engineering. At present, the two-dimensional rigid body limit equilibrium method is mainly used in slope stability analysis, which is widely used in engineering because of its simple calculation and clear physical meaning. However, the actual slope stability analysis is a three-dimensional problem, which should be studied by three-dimensional stability analysis method. In addition, some reinforcement measures are often adopted for the slope with low safety reserve, among which the prestressed anchor cable is widely used in the reinforcement of slope, especially in the rock slope because of its obvious reinforcement effect. In the 2-D stability analysis of anchored slope, the treatment of anchor cable is mainly to simplify the anchor force to a unit width, but the arrangement of anchor cable is generally three-dimensional in practical engineering, so, This simplified treatment does not reflect the actual situation. In the stability analysis of anchored slope, it is necessary to study the three-dimensional limit analysis method considering the three-dimensional characteristics of prestressed anchor cable. Based on this, an improved three-dimensional limit analysis method considering the three-dimensional characteristics of prestressed anchor cable is proposed, and the related discussion and engineering application are carried out. The main tasks are as follows: 1) reviewing and summarizing the work done by scholars in the field of slope three-dimensional limit equilibrium analysis in recent years, and simply discussing the applicability, advantages and disadvantages of various analytical methods; This paper introduces the basic theory and calculation method of the 3D limit analysis method of slope which was put forward by the research group in recent years, and improves on it, and puts forward the solution of the three-dimensional limit equilibrium and the upper limit analysis of the limit analysis considering the three-dimensional characteristic of the prestressed anchor cable. The related formulas are deduced. 3) taking the reinforcement project of accumulation body in front of Xiaowan left bank dam as an example, different cable arrangement schemes are designed, and the three-dimensional limit analysis method considering prestressed anchor cable is verified in this paper, and the three-dimensional reinforcement effect of prestressed anchor cable is discussed. Using two-dimensional rigid body limit equilibrium, three-dimensional rigid body limit equilibrium and F1ac3D finite difference method, the normal storage water level of 254m in the old reservoir and 313m after the expansion of the reservoir are comprehensively analyzed. The reinforcement scheme of prestressed Anchorage cable is put forward for the condition of 313m normal storage water level after expansion. Three-dimensional limit analysis method considering prestressed anchor cable is used to evaluate the reinforcement scheme and the F1aC3D finite difference method is used to analyze the deformation and stability of the slope before and after anchoring. The results show that prestressed Anchorage cable plays a significant role in reinforcing the Wujiang landslide.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU45

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