【摘要】：伴隨著我國(guó)快速發(fā)展的建設(shè)事業(yè)和西部大開發(fā)戰(zhàn)略的實(shí)施,我國(guó)高等級(jí)公路建設(shè)逐漸由東部轉(zhuǎn)向西部,由平原轉(zhuǎn)入山區(qū)。山區(qū)地形、地質(zhì)條件復(fù)雜,高填深挖不可避免,所以,高邊坡的穩(wěn)定性研究對(duì)公路建設(shè)、運(yùn)營(yíng)具有重大的意義。雖然目前已經(jīng)有比如極限平衡法、有限元分析法等研究方法來(lái)進(jìn)行邊坡的穩(wěn)定性分析,但是由于極限平衡法沒有考慮土體應(yīng)力應(yīng)變關(guān)系的影響,而且需要提前假定土坡滑裂面的形狀和位置,這些假定和簡(jiǎn)化可能與實(shí)際不符;相比較而言有限單元法計(jì)算結(jié)果要更準(zhǔn)確,但無(wú)法動(dòng)態(tài)地模擬土坡的整個(gè)破壞過程。作為離散單元法之一的顆粒流方法,就可以很好地彌補(bǔ)上述方法所存在的弊端。本文研究離散元法的顆粒流理論在高填方邊坡穩(wěn)定性的分析中的應(yīng)用,主要開展了以下的研究工作:1、首先通過了室內(nèi)實(shí)驗(yàn),研究了高填方所用的填料的物理力學(xué)性質(zhì)。借助試驗(yàn),獲得了在邊坡穩(wěn)定性分析中必需的宏觀參數(shù),為后文采用顆粒流理論進(jìn)行高邊坡模型建立所需的細(xì)觀參數(shù)提供依據(jù)。試驗(yàn)得出的宏觀參數(shù),可采用傳統(tǒng)的極限平衡分析方法進(jìn)行穩(wěn)定性分析,并與離散元方法的分析結(jié)果進(jìn)行相互對(duì)比研究。2、通過詳細(xì)介紹離散元法顆粒流方法應(yīng)用于土體分析的基本理論,進(jìn)行雙軸試驗(yàn)數(shù)值模擬,建立了細(xì)觀參數(shù)與宏觀參數(shù)之間的關(guān)系,室內(nèi)試驗(yàn)獲取宏觀參數(shù)匹配顆粒流方法所需的細(xì)觀參數(shù),為建立高填方土質(zhì)邊坡坡顆粒流模型提供細(xì)觀參數(shù)依據(jù)。3、運(yùn)用離散元顆粒流軟件建立了高填方土質(zhì)邊坡顆粒流模型,結(jié)合強(qiáng)度折減法和改進(jìn)的重力增加法對(duì)其穩(wěn)定性動(dòng)態(tài)的模擬了邊坡滑動(dòng)破壞的整個(gè)過程,求得其安全系數(shù)和土坡滑動(dòng)破壞面,并將計(jì)算結(jié)果與基于傳統(tǒng)的極限平衡法分析軟件的計(jì)算結(jié)果進(jìn)行了比較。總之,通過以上的研究分析可知離散元法分析高邊坡穩(wěn)定性可以很好的彌補(bǔ)其他分析方法的不足之處,不需提前假定土坡滑裂面的位置和形狀,就能模擬整個(gè)土坡的動(dòng)態(tài)破壞過程,并且求得的安全系數(shù)和滑動(dòng)面位置與其他方法的結(jié)果非常接近。
[Abstract]:With the rapid development of China's construction and the implementation of the strategy of the development of the western region, the construction of high-grade highways in China has gradually shifted from the east to the west, and from the plain to the mountainous areas. The terrain and geological conditions of mountainous area are complicated and the high fill and deep excavation is inevitable. Therefore, the study of the stability of high slope is of great significance to the construction and operation of highway. Although there are some research methods, such as limit equilibrium method and finite element analysis method, to analyze slope stability, however, the limit equilibrium method does not take into account the influence of stress and strain relationship of soil. Furthermore, the shape and position of the slip surface of the slope need to be assumed in advance, and these assumptions and simplification may not be in accordance with the actual situation. Compared with the finite element method, the finite element method is more accurate, but it can not dynamically simulate the whole failure process of soil slope. As one of the discrete element methods, the particle flow method can make up for the shortcomings of the above methods. In this paper, the application of particle flow theory of discrete element method to the stability analysis of high fill slope is studied. The main research work is as follows: 1. The physical and mechanical properties of fillers used in high fill are studied through laboratory experiments. With the help of experiments, the necessary macro parameters in slope stability analysis are obtained, which provides the basis for the establishment of high slope model by particle flow theory. The macroscopic parameters obtained from the test can be analyzed by the traditional limit equilibrium analysis method, and compared with the results of the discrete element method. By introducing the basic theory of discrete element particle flow method applied to soil analysis, the biaxial test numerical simulation is carried out, and the relationship between meso-parameters and macroscopic parameters is established. The microscopic parameters needed by the macroscopic parameter matching particle flow method are obtained in laboratory test, which provides the meso-parameter basis for the establishment of the grain-flow model on the slope of the high fill soil. 3. The particle flow model of high fill soil slope is established by using discrete element particle flow software. The whole process of slope sliding failure is simulated by combining the strength reduction method and the improved gravity increase method. The safety factor and sliding failure surface of soil slope are obtained, and the calculated results are compared with those based on the traditional limit equilibrium analysis software. In a word, through the above research and analysis, it can be seen that the discrete element method can make up for the shortcomings of other analysis methods, without presupposing the position and shape of the slope sliding surface. The dynamic failure process of the whole slope can be simulated, and the safety factor and sliding surface position obtained are very close to those obtained by other methods.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.14

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本文編號(hào)：2416109