基于有限差分強度折減法及其改進(jìn)折減法的對比研究
發(fā)布時間：2018-10-08 15:20
【摘要】：關(guān)于邊坡的穩(wěn)定性研究一直以來都是工程領(lǐng)域的熱點問題,而我國工程建設(shè)迅猛發(fā)展、地形地質(zhì)情況復(fù)雜,此問題變得尤為突出。從事邊坡研究的工作者很多,但由于涉及到巖土類問題的研究本身就有其復(fù)雜性,加之邊坡體的不規(guī)則外形以及易受到來自外界的干擾,致使邊坡穩(wěn)定的研究一直比較緩慢。而隨著工程開展速度的不斷提高,相關(guān)的理論研究已經(jīng)落后于工程實際。由于計算機具有強大的數(shù)據(jù)處理能力,越來越多的學(xué)者開始將邊坡穩(wěn)定的研究理論與計算機技術(shù)相結(jié)合,用來對邊坡體的破壞情況進(jìn)行模擬。現(xiàn)今的數(shù)值計算軟件,其邊坡理論主要是基于強度折減法來進(jìn)行仿真計算。傳統(tǒng)的強度折減法對于整個邊坡的土體抗剪參數(shù)(c粘聚力、φ內(nèi)摩擦角),采用同一個折減系數(shù)F進(jìn)行強度折減。而實際工程中,當(dāng)邊坡體發(fā)生破壞時,滑坡面上下的巖土體其對邊坡滑動的抵抗能力所發(fā)揮的程度必然是不同的,所以對于滑坡面以上的滑體、滑坡面下的滑床,二者應(yīng)該有各自的折減系數(shù)F1、F2。正是鑒于此,本文擬利用FLAC3D軟件對邊坡問題進(jìn)行分析,進(jìn)而提出改進(jìn)的強度折減法。由于此方法處于起步階段,從計算效率的角度考慮,本改進(jìn)的強度折減方法更適用于,潛在滑坡面已知的邊坡體。本文的主要研究過程如下：一、對FLAC3D有限差分?jǐn)?shù)值計算軟件以及強度折減法進(jìn)行了簡單介紹。通過自編的強度折減方法,選取安全系數(shù)大于1以及安全系數(shù)小于1的理想邊坡進(jìn)行分析研究。對于一個邊坡體分別對其滑體、滑床進(jìn)行單獨折減,通過對比分析提出改進(jìn)的強度折減方法。二、本文對提出的改進(jìn)強度折減法的可靠性進(jìn)行了研究分析。以傳統(tǒng)的強度折減法的結(jié)果為基準(zhǔn),通過改變影響邊坡體穩(wěn)定性的兩個主要參數(shù)粘聚力c、摩擦角の的值,來討論改進(jìn)的強度折減法是否能夠穩(wěn)定的對邊坡體進(jìn)行評價。并得到了以下幾個結(jié)論：1、粘聚力和摩擦角對邊坡的穩(wěn)定性影響較大；2、改進(jìn)的強度折減法得到的綜合安全系數(shù)與傳統(tǒng)強度折減法得到的結(jié)果的最大偏差小于5%,即可認(rèn)為運用該改進(jìn)的強度折減法進(jìn)行邊坡穩(wěn)定性分析是正確的；3、對于自然狀態(tài)下可以穩(wěn)定的邊坡體,傳統(tǒng)的強度折減法得到的穩(wěn)定性評價偏高,對于自然狀態(tài)下無法穩(wěn)定的邊坡體,傳統(tǒng)的強度折減法過低的評價了邊坡的安全穩(wěn)定性。因而,對于邊坡的穩(wěn)定性分析采用改進(jìn)的強度折減法更為合理。三、本文將提出的改進(jìn)強度折減法,應(yīng)用于右所屯滑坡的穩(wěn)定評價中。選取右所屯滑坡最危險的剖面進(jìn)行分析,得到的滑動面位置與前期提供的潛在滑動面位置是一致的。四、由于抗滑樁具有抗滑能力強、適應(yīng)能力強、施工周期短等優(yōu)點,使其在工程中得到了廣泛的認(rèn)可。本文采用雙排抗滑樁對右所屯滑坡的典型剖面進(jìn)行加固處置,通過單因素分析法研究樁間距、樁位對邊坡穩(wěn)定性的研究,最后歸納總結(jié)出本模型抗滑樁的最優(yōu)加固方案。五、最后對本文的成果進(jìn)行了總結(jié),并對今后要開展有關(guān)方面研究的學(xué)者提出了自己的建議。
[Abstract]:The stability of the slope has always been a hot issue in the engineering field, and the construction of China's engineering construction has developed rapidly. There are many workers engaged in slope research, but because of the complexity of the research involved in rock and soil problems, along with the irregular shape of the slope body and the disturbance from the outside world, the research on slope stability has been relatively slow. With the increasing speed of the project, the relevant theoretical research has lagged behind the engineering practice. Due to the powerful data processing ability of the computer, more and more scholars begin to combine the research theory of slope stability with the computer technology, which is used to simulate the damage of the slope body. Today's numerical calculation software, its theory of slope is mainly based on the strength reduction method to carry on the simulation calculation. In this paper, the shear parameters (c-adhesive force and internal friction angle) of the soil body of the whole slope are reduced by the traditional strength reduction and subtraction. In the practical engineering, when the slope body is damaged, the degree of resistance of the rock-soil body under the landslide surface to the slope sliding must be different, so for the sliding body above the landslide surface and the sliding bed under the landslide surface, the two should have respective reduction coefficients F1 and F2. In view of this, this paper intends to use FLAC3D software to analyze the slope problems, and then put forward the improved strength reduction and subtraction. Since the method is in the initial stage, the improved strength reduction method is more suitable for the side slope body known to the potential landslide surface from the angle of calculation efficiency. The main research process of this paper is as follows: 1. Simple introduction of FLAC3D finite difference numerical calculation software and strength reduction and subtraction is carried out. By means of self-made intensity reduction method, an ideal slope with a safety factor greater than 1 and a safety factor of less than 1 is selected for analysis and study. For one side slope body, the sliding body and slide bed are separately reduced, and the improved strength reduction method is put forward through comparative analysis. Secondly, the reliability of the proposed improved intensity reduction is studied in this paper. Based on the results of traditional strength reduction and subtraction, the paper discusses whether the improved strength reduction and subtraction can be used to evaluate the slope body stably by changing the value of two main parameters affecting the stability of the slope body. The following conclusions are obtained: 1. The influence of cohesive force and friction angle on the stability of side slope is larger; 2. The maximum deviation of the comprehensive safety coefficient obtained by the improved strength reduction and subtraction is less than 5% with the result obtained by traditional intensity reduction and subtraction. it can be concluded that the slope stability analysis is correct by using the improved strength reduction and subtraction method, The traditional strength reduction method has evaluated the safety stability of the slope. Therefore, it is more reasonable for the stability analysis of the slope to adopt improved strength reduction and subtraction. Thirdly, the improved strength reduction method proposed in this paper is applied to the stability evaluation of the right Shantun landslide. The most dangerous section of the right Titun landslide is selected for analysis, and the position of the sliding surface is consistent with the position of the potential sliding surface provided in the prior period. 4. Owing to the advantages of strong anti-skid ability, strong adaptability and short construction period, it has been widely recognized in the project. In this paper, the typical cross section of the right Lutun landslide is reinforced and treated by double-row method. Through single-factor analysis, the study of pile spacing and pile position on slope stability is studied. Finally, the optimal reinforcement scheme of this model is summarized. Finally, the results of this paper are summarized, and their suggestions are put forward in the future.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43
本文編號：2257259
[Abstract]:The stability of the slope has always been a hot issue in the engineering field, and the construction of China's engineering construction has developed rapidly. There are many workers engaged in slope research, but because of the complexity of the research involved in rock and soil problems, along with the irregular shape of the slope body and the disturbance from the outside world, the research on slope stability has been relatively slow. With the increasing speed of the project, the relevant theoretical research has lagged behind the engineering practice. Due to the powerful data processing ability of the computer, more and more scholars begin to combine the research theory of slope stability with the computer technology, which is used to simulate the damage of the slope body. Today's numerical calculation software, its theory of slope is mainly based on the strength reduction method to carry on the simulation calculation. In this paper, the shear parameters (c-adhesive force and internal friction angle) of the soil body of the whole slope are reduced by the traditional strength reduction and subtraction. In the practical engineering, when the slope body is damaged, the degree of resistance of the rock-soil body under the landslide surface to the slope sliding must be different, so for the sliding body above the landslide surface and the sliding bed under the landslide surface, the two should have respective reduction coefficients F1 and F2. In view of this, this paper intends to use FLAC3D software to analyze the slope problems, and then put forward the improved strength reduction and subtraction. Since the method is in the initial stage, the improved strength reduction method is more suitable for the side slope body known to the potential landslide surface from the angle of calculation efficiency. The main research process of this paper is as follows: 1. Simple introduction of FLAC3D finite difference numerical calculation software and strength reduction and subtraction is carried out. By means of self-made intensity reduction method, an ideal slope with a safety factor greater than 1 and a safety factor of less than 1 is selected for analysis and study. For one side slope body, the sliding body and slide bed are separately reduced, and the improved strength reduction method is put forward through comparative analysis. Secondly, the reliability of the proposed improved intensity reduction is studied in this paper. Based on the results of traditional strength reduction and subtraction, the paper discusses whether the improved strength reduction and subtraction can be used to evaluate the slope body stably by changing the value of two main parameters affecting the stability of the slope body. The following conclusions are obtained: 1. The influence of cohesive force and friction angle on the stability of side slope is larger; 2. The maximum deviation of the comprehensive safety coefficient obtained by the improved strength reduction and subtraction is less than 5% with the result obtained by traditional intensity reduction and subtraction. it can be concluded that the slope stability analysis is correct by using the improved strength reduction and subtraction method, The traditional strength reduction method has evaluated the safety stability of the slope. Therefore, it is more reasonable for the stability analysis of the slope to adopt improved strength reduction and subtraction. Thirdly, the improved strength reduction method proposed in this paper is applied to the stability evaluation of the right Shantun landslide. The most dangerous section of the right Titun landslide is selected for analysis, and the position of the sliding surface is consistent with the position of the potential sliding surface provided in the prior period. 4. Owing to the advantages of strong anti-skid ability, strong adaptability and short construction period, it has been widely recognized in the project. In this paper, the typical cross section of the right Lutun landslide is reinforced and treated by double-row method. Through single-factor analysis, the study of pile spacing and pile position on slope stability is studied. Finally, the optimal reinforcement scheme of this model is summarized. Finally, the results of this paper are summarized, and their suggestions are put forward in the future.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 鄭穎人,雷文杰,趙尚毅,鄧衛(wèi)東;抗滑樁設(shè)計中的兩個問題[J];公路交通科技;2005年S1期
，本文編號：2257259
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