【摘要】：在自重、降雨、外部載荷等因素的作用下,高填路堤出現(xiàn)了各種不同形式的破壞。研究高填路堤穩(wěn)定性,可以有效的防治路堤失穩(wěn)破壞,避免不必要的經(jīng)濟(jì)損失。本文借助有限元軟件Abaqus進(jìn)行數(shù)值模擬分析,編寫基于滑移線場(chǎng)理論的有限元后處理Matlab程序,對(duì)高填路堤在不同工況條件下的穩(wěn)定性進(jìn)行研究。首先,本文對(duì)滑移線場(chǎng)理論進(jìn)行了大量的文獻(xiàn)調(diào)研,闡述了滑移線場(chǎng)理論的基本原理。其次,首次利用滑移線場(chǎng)理論,探究高填路堤在不同工況條件下穩(wěn)定性的基本規(guī)律。數(shù)值模擬結(jié)果表明:高填路堤三臺(tái)階情況下,增大第三臺(tái)階的高度,路堤安全系數(shù)增大;在第一臺(tái)階和第三臺(tái)階坡度不變情況下,放緩第二臺(tái)階坡度,路堤安全系數(shù)增大;在不同的換填土強(qiáng)度參數(shù)情況下,安全系數(shù)隨著內(nèi)摩擦角和黏聚力的增大而增大,但是增大趨勢(shì)有所減緩。當(dāng)內(nèi)摩擦角增大到30°、黏聚力增大到30 kPa的時(shí)候,對(duì)塑性區(qū)范圍和臨界滑動(dòng)面的位置影響逐漸減弱,其中內(nèi)摩擦角對(duì)塑性區(qū)的范圍影響更大。根據(jù)臨界滑動(dòng)面的變化趨勢(shì)和最小安全系數(shù),建議換填后的材料強(qiáng)度參數(shù)應(yīng)選取黏聚力大于20 kPa、內(nèi)摩擦角大于20°。最后,選取廣佛肇高速典型高填路堤作為分析實(shí)例,分析了高填路堤基底在換填前后的安全系數(shù)和臨界滑動(dòng)面的變化趨勢(shì)。數(shù)值模擬結(jié)果表明:換填后,路堤安全系數(shù)有了較大幅度的提高,并且大于1.300,臨界滑動(dòng)面逐漸上移,滑動(dòng)土體范圍逐漸變小;驗(yàn)證了原設(shè)計(jì)方案的可靠性,提出了安全經(jīng)濟(jì)的臺(tái)階高度組合設(shè)計(jì)方案。
[Abstract]:Under the influence of gravity, rainfall, external load and other factors, there are various kinds of destruction of high fill embankment. The study on the stability of high filling embankment can effectively prevent the instability and damage of embankment and avoid unnecessary economic loss. In this paper, with the help of finite element software Abaqus, the finite element post-processing Matlab program based on slip-line field theory is compiled to study the stability of high-fill embankment under different working conditions. Firstly, this paper makes a great deal of literature investigation on the slip line field theory, and expounds the basic principle of the slip line field theory. Secondly, the basic law of stability of high fill embankment under different working conditions is studied by using slip line field theory for the first time. The results of numerical simulation show that when the height of the third step is increased, the safety factor of the embankment increases when the slope of the first step and the third step is constant, the slope of the second step is slowed down and the safety factor of the embankment increases when the slope of the first step and the third step is constant. Under different strength parameters, the safety factor increases with the increase of internal friction angle and cohesion, but the increasing trend decreases. When the internal friction angle increases to 30 擄and the cohesion force increases to 30 kPa, the influence on the range of plastic zone and the position of critical sliding surface decreases gradually, and the influence of internal friction angle on the range of plastic zone is greater. According to the change trend of critical sliding surface and the minimum safety factor, it is suggested that the internal friction angle greater than 20 擄should be selected for the strength parameters of the material after replacement. Finally, taking the typical high-fill embankment of Guangfuzhao highway as an example, the change trend of safety factor and critical slip surface of the high-fill embankment foundation before and after replacement is analyzed. The numerical simulation results show that the safety factor of embankment has been greatly improved after replacement, and more than 1.300, the critical sliding surface gradually moves up, and the scope of sliding soil gradually becomes smaller; The reliability of the original design scheme is verified and a safe and economical step height combination design scheme is put forward.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U416.12

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本文編號(hào)：2436927