發(fā)布時間：2018-01-03 05:09

  本文關鍵詞：長沙至昆明客運專線玉屏至昆明段柳樹灣順層滑坡分析與治理　出處：《西南交通大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 順層滑坡 變形特征 穩(wěn)定性評價 影響因素 治理措施

【摘要】：玉屏至昆明段鐵路線作為西南地區(qū)的路網主骨架的干線之一,是滬昆客運專線和京廣線聯(lián)結的重要交通要塞。柳樹灣順層滑坡位于玉屏至昆明段鐵路線中段,開挖過程受暴雨影響,沿著巖性差異面發(fā)生失穩(wěn)破壞。本文結合研究區(qū)區(qū)域地質條件,通過野外調查和室內試驗,掌握了滑坡形態(tài),影響因素以及形成機制;通過數(shù)值模擬,分析位移、應力和塑性區(qū)分布對柳樹灣滑坡進行穩(wěn)定性分析;運用極限平衡法計算剩余滑坡推力,對柳樹灣滑坡進行防護設計計算,并運用數(shù)值分析進行驗算,證明結果的可靠性。本文的主要研究成果如下:(1)通過野外調查確定了柳樹灣順層滑坡的滑坡范圍和不穩(wěn)定區(qū)域滑體的主軸方向為N68° W,垂直于線路,滑坡的主軸長度約100m,寬度為125m,滑體厚度為5～16m,主要為碎石土,滑塌方量約為12.5萬m~3(2)通過野外調查,探明了邊坡的失穩(wěn)因素,確定了降雨為主要的誘發(fā)因素,降雨導致順層邊坡的巖層差異面強度明顯降低;研究區(qū)軟巖含泥量較高,遇水軟化,在強降雨作用下,泥灰?guī)r的持續(xù)軟化是本區(qū)緩傾角深層巖質滑坡發(fā)生的直接原因。(3)計算了滑坡的下滑推力及其穩(wěn)定系數(shù),分析了三個滑坡剖面在天然狀態(tài)下和暴雨狀態(tài)下該滑坡的穩(wěn)定性,發(fā)現(xiàn)其整體處于穩(wěn)定或者基本穩(wěn)定的狀態(tài),剖面Ⅰ-Ⅰ',Ⅲ-Ⅲ'前緣變形區(qū)處于不穩(wěn)定狀態(tài),Ⅱ-Ⅱ'前緣變形區(qū)處于穩(wěn)定狀態(tài)。并對開挖后的邊坡進行了數(shù)值模擬的分析,結果分析發(fā)現(xiàn)邊坡下滑趨勢明顯。(4)根據(jù)極限平衡法計算得出的下滑推力,給出了相應的治理措施,通過對治理后的柳樹灣滑坡進行數(shù)值模擬,得到的穩(wěn)定系數(shù)滿足設計要求。
[Abstract]:As one of the main backbone of the railway network in southwest China, the railway line from Yuping to Kunming is an important traffic fortress connecting the Shanghai-Kunming passenger dedicated line and the Beijing-Guangzhou line. The down-layer landslide in Liushuwan lies in the middle section of the railway line from Yuping-Kunming. The excavation process is affected by the rainstorm and the instability occurs along the lithologic difference surface. Combining with the regional geological conditions of the study area, through field investigation and laboratory tests, the paper grasps the landslide shape, influencing factors and forming mechanism. The stability of Liushuwan landslide was analyzed by numerical simulation, displacement, stress and plastic zone distribution. The residual landslide thrust is calculated by the limit equilibrium method, and the protection design of the Liushuwan landslide is calculated, and the numerical analysis is used to verify the calculation. The main research results of this paper are as follows: 1) through field investigation, the landslide range of the bedding landslide in Liushuwan and the direction of the main axis of the sliding body in the unstable area are determined to be N68 擄W. Vertical to the line, the length of the main shaft of the landslide is about 100m, the width is 125m, the thickness of the slide body is 5m / 16m, mainly is gravel soil, and the landslide volume is about 125,000 mm2 / 3 / 2) through field investigation. The factors of slope instability are proved, and the rainfall is determined as the main inducing factor, which leads to the obvious decrease of the strength of the strata difference surface of the bedding slope. The soft rock in the study area has a high content of mud and softens with water, and it is under the action of heavy rainfall. The continuous softening of mudstone is the direct cause of the occurrence of deep rock landslide in the area with slow dip angle.) the sliding thrust and the coefficient of stability of landslide are calculated. The stability of three landslide sections under natural and rainstorm conditions is analyzed. It is found that the whole landslide is stable or basically stable, section 鈪，

本文編號：1372497