本文選題：達宣公路 + 老林村滑坡��； 參考：《成都理工大學》2015年碩士論文

【摘要】：滑坡是山區(qū)公路建設中的主要地質災害之一。四川省達宣公路K6+460-K6+760m處老林村滑坡局部出現較明顯的變形跡象,擬建達宣公路在滑坡體中下部通過。局部的填方將對滑坡產生一定影響,所以本項研究對公路路基安全和工程施工及公路的運行安全具有重要意義。本文在通過對老林村滑坡的現場調查基礎上,收集相關資料,對該滑坡的特征及形成機制開展系統(tǒng)的研究,通過定性的方法分析滑坡穩(wěn)定性及路堤填筑后滑坡破壞模式及穩(wěn)定性,同時采用定量的方法計算天然工況、暴雨工況下滑坡穩(wěn)定性及局部穩(wěn)定性,運用GEO-STUDIO數值分析軟件對滑坡天然工況及路堤填筑工況下應力應變變化及暴雨工況下滑坡體滲流場進行數值模擬分析。在上述研究基礎上,針對滑坡穩(wěn)定性狀況及變形特征提出具體防治措施,進行防治工程的設計,主要獲得以下認識及成果:(1)老林村滑坡為發(fā)育于紅層砂泥巖地層中的大型緩傾順層老滑坡,平面上整體呈舌形,平均厚度12m,約230×104m3,滑體以塊碎石土為主,滑帶為粉質粘土,滑床為侏羅系中統(tǒng)新田溝組雜色砂巖、水云母頁巖,滑面呈直線型,滑坡形成機制為斜坡受構造與坡體卸荷作用影響,同時斜坡中泥巖軟弱夾層在前緣河谷下切侵蝕過程中被切穿揭露、軟化,以不利的巖土結構組合為不良地質基礎,以“滑移-拉裂”破壞模式沿軟弱層向臨空面滑移破壞。(2)滑坡整體未出現明顯變形現象,滑坡形成后表現出分區(qū)變形特征(1#變形區(qū)、2#變形區(qū))。自然狀態(tài)下滑坡整體及1#變形區(qū)、2#變形區(qū)處于穩(wěn)定狀態(tài),降雨工況下滑坡整體處于基本穩(wěn)定狀態(tài),1#變形區(qū)、2#變形區(qū)處于欠穩(wěn)定狀態(tài)。(3)在滑坡前部填方后,1#變形區(qū)、2#變形區(qū)不受填方影響,穩(wěn)定性狀態(tài)為改變,滑坡整體處于基本穩(wěn)定狀態(tài),填方段及以下處于欠穩(wěn)定狀態(tài),降雨條件下滑坡整體處于基本穩(wěn)定狀態(tài),路堤及以下為不穩(wěn)定狀態(tài)。(4)針對老林村滑坡特征及填方后滑坡穩(wěn)定性狀態(tài),進行了防治措施研究,針對滑坡的特征采用地表排水+抗滑樁支擋相結合的治理方案,在滑坡后緣外設置截水溝,滑坡兩側設置排水溝,在填筑路堤前緣設置抗滑樁。
[Abstract]:Landslide is one of the main geological disasters in mountain highway construction.There are obvious signs of local deformation of Laolin Village landslide at K6 460-K6 760m of Daxuan Highway in Sichuan Province, and it is proposed to build Daxuan Highway through the middle and lower part of the landslide body.The partial fill will affect the landslide to some extent, so this study is of great significance to the safety of highway subgrade, construction and operation of highway.On the basis of field investigation of Laolin village landslide, this paper collects relevant data, and carries out systematic research on the characteristics and formation mechanism of the landslide.Through qualitative analysis of landslide stability and landslide failure mode and stability after embankment filling, quantitative method is used to calculate landslide stability and local stability under rainstorm conditions.The stress and strain variation of landslide under natural condition and embankment filling condition and seepage field of landslide body under rainstorm condition were simulated by GEO-STUDIO software.On the basis of the above research, according to the stability condition and deformation characteristics of landslide, the concrete prevention measures are put forward, and the design of the prevention and control project is carried out.The main results are as follows: (1) Laolin Village landslide is a large slowly inclined old landslide in the sand and mudstone strata of Yu Hong layer, with an average thickness of 12 m, with an average thickness of 230 脳 10 4 m 3. The landslide is dominated by macadam and the slip zone is silty clay.The slip bed is the mixed color sandstone of Xintiangou formation of the Middle Jurassic, the hydromica shale, the slippery surface is linear, and the landslide formation mechanism is influenced by the structure and the unloading of the slope body.At the same time, the mudstone weak intercalation in the slope is cut through and exposed during the cutting erosion process of the leading valley, and the bad geological foundation is the unfavorable rock and soil structure combination.According to the failure mode of "slipping-tension crack", there is no obvious deformation phenomenon in the whole landslide along the weak layer to the face of the goaf. After the formation of the landslide, the deformation characteristics of the landslide are shown in the zonal deformation zone and the deformation zone is the same as the one in the 2# deformation area.Under the natural condition, the whole landslide and the deformation area of 1# deformation area are in stable state.Under rainfall conditions, the whole landslide is in a basic stable state. The deformation area of the deformation area is in an unstable state. (3) after filling the front part of the landslide, the deformation area of the deformation area is not affected by the fill, but the stability state is changed.The whole landslide is in a basic stable state, the fill section and below are in an unstable state, and the whole landslide is in a basic stable state under the condition of rainfall.According to the characteristics of the landslide in Laolin Village and the stability of the landslide after filling, the prevention and control measures are studied, and the treatment scheme of the surface drainage anti-slide pile supporting and retaining is adopted in view of the characteristics of the landslide.At the back edge of the landslide, there are intercepting gullies, drainage ditches on both sides of the landslide, and anti-slide piles on the front edge of the embankment.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U418.55

【參考文獻】

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1 李曉敏;牛r，

本文編號：1757720