【摘要】：多數(shù)土體或多或少具有一定的剪脹性,但剪脹性卻對土的受力、變形以及穩(wěn)定性具有明顯的影響,需要在實際工程中合理應用和評價�；虺鲇诤唵位虺鲇诒Ｊ氐哪康�,目前在土質(zhì)邊坡的穩(wěn)定分析中經(jīng)常把非零剪脹角取為0°(即采用非關聯(lián)流動法則,且不考慮土體的剪脹性)。通常的看法是把非零剪脹角取為0°得到的結果是偏于保守的。例如,在土質(zhì)邊坡穩(wěn)定分析中把剪脹角取為0°所得到的安全系數(shù)通常最小。從安全系數(shù)角度來評價邊坡的穩(wěn)定性,盡管具有重要意義,但并不全面,所得到的結果也未必可靠。本文主要針對土質(zhì)邊坡體系,從安全系數(shù),土的受力變形行為,抗滑樁和擋土結構的受力方面綜合分析土質(zhì)邊坡的穩(wěn)定性,力求獲得更加全面、可靠的結論。 本文的主要研究內(nèi)容有：(1)研究了剪脹角對邊坡安全系數(shù)的影響。目前關于剪脹角對邊坡安全系數(shù)的影響有兩種看法：一種是剪脹角越大安全系數(shù)越大；另一種是安全系數(shù)隨剪脹角增大呈現(xiàn)先增大后減小的拋物線樣式。本文首先對此問題進行論證,分析了之所以出現(xiàn)這兩種說法的原因,同時指出了強度折減法在邊坡穩(wěn)定分析中還存在局限性。(2)采用有限元軟件ABAQUS分析了剪脹角對分層邊坡安全系數(shù)的影響。(3)采用ABAQUS軟件建立了三維抗滑樁加固邊坡、擋土墻加固邊坡以及樁墻聯(lián)合加固邊坡有限元模型。具體分析了剪脹角對邊坡安全系數(shù)、抗滑樁變形、抗滑樁受力,擋土墻受力的影響。分析總結了把非零剪脹角取為0°的各種情況的合理性。 本文的主要創(chuàng)新點為： (1)對目前關于剪脹角對土質(zhì)邊坡安全系數(shù)影響的兩種看法進行評判,并指出強度折減法在邊坡穩(wěn)定分析中的局限性。 (2)不僅考慮了剪脹角對土質(zhì)邊坡安全系數(shù)的影響,還研究了剪脹角對抗滑樁、擋土墻受力的影響,全面分析了剪脹角對土質(zhì)邊坡體系穩(wěn)定性的影響。 本文的研究目的是為工程人員在邊坡的數(shù)值模擬中提供參考,也就是應該重視剪脹角對土質(zhì)邊坡體系穩(wěn)定性的影響。
[Abstract]:Most soils have more or less shear dilatancy, but the shear dilatancy has obvious influence on the stress, deformation and stability of the soil, which needs to be applied and evaluated reasonably in practical engineering. Or for the sake of simplicity or conservatism, the non-zero shear expansion angle is often taken as 0 擄in the stability analysis of soil slope at present (that is to say, the non-correlated flow rule is adopted, and the shear dilatancy of soil is not taken into account). The general view is that the results obtained when the non-zero shear expansion angle is taken to be 0 擄are conservative. For example, in the stability analysis of soil slope, the safety factor is usually the minimum when the shear expansion angle is taken as 0 擄. The evaluation of slope stability from the angle of safety factor is of great significance, but it is not comprehensive, and the results obtained are not reliable. In this paper, the stability of soil slope is analyzed comprehensively from the aspects of safety factor, deformation behavior of soil, anti-slide pile and retaining structure, in order to obtain a more comprehensive and reliable conclusion. The main contents of this paper are as follows: (1) the influence of shear expansion angle on slope safety factor is studied. At present, there are two views on the influence of the expansion angle on the slope safety factor: one is that the greater the expansion angle is, the greater the safety factor is, the other is that the safety factor increases first and then decreases with the increase of the expansion angle. This paper first demonstrates this problem and analyzes the reasons why these two statements appear. At the same time, the limitation of strength reduction method in slope stability analysis is pointed out. (2) the influence of shear expansion angle on safety factor of layered slope is analyzed by using finite element software ABAQUS. (3) Three-dimensional anti-slide pile is used to reinforce slope. Finite element model of retaining wall reinforced slope and pile wall combined reinforcement slope. The influence of shear expansion angle on slope safety factor, anti-slide pile deformation, anti-slide pile force and retaining wall force is analyzed in detail. The rationality of taking the non-zero expansion angle as 0 擄is analyzed and summarized. The main innovations of this paper are as follows: (1) two opinions on the influence of shear expansion angle on the safety factor of soil slope are evaluated, and the limitation of strength reduction method in slope stability analysis is pointed out. (2) not only the influence of the expansion angle on the safety factor of the soil slope is considered, but also the influence of the shear expansion angle on the stability of the soil slope system is studied. The purpose of this paper is to provide a reference for engineers in the numerical simulation of slope, that is, the influence of shear expansion angle on the stability of soil slope system should be paid attention to.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU43

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