本文選題：電塔塔基滑坡 + 失穩(wěn)機理　； 參考：《西南交通大學》2014年碩士論文

【摘要】：2012年8月29日至30日,錦屏一級水電站施工區(qū)內外連降大雨,引發(fā)群發(fā)性地質災害,錦屏一級水電站左岸G1002電塔塔基斜坡局部發(fā)生滑坡,造成電塔D腿裸露懸空,給電塔和整個輸電線路的安全造成嚴重威脅。本文在詳細野外勘查的基礎上,深化G1002電塔塔基滑坡的工程地質條件,對滑坡進行了分區(qū),分析了滑坡的形成條件,還原了滑坡發(fā)生的過程,探討了滑坡的形成機理；運用極限平衡法,對滑坡殘留體進行了穩(wěn)定性定量計算；通過數(shù)值模擬方法,研究了滑坡殘留體的穩(wěn)定性和失穩(wěn)過程及機理；在以上研究的基礎上,針對性地提出了滑坡的兩種治理方案。通過剖析此典型實例,以期能為高山峽谷地區(qū)電塔選址提供借鑒和參考。主要研究內容和成果如下： 1、根據(jù)詳細的滑坡現(xiàn)場勘查和滑坡變形特征,介紹了G1002電塔塔基滑坡的詳細特征,并進行了分區(qū),介紹了每個區(qū)域的特征。 2、通過分析滑坡的工程地質條件和水文地質條件,歸納總結了滑坡的形成條件。得出陡峭的地形特征、有利的巖體和坡體結構、山洪對坡腳的淘刷及連續(xù)的強降雨是誘發(fā)滑坡的關鍵因素。 3、根據(jù)滑坡的工程地質條件和變形特點,還原了滑坡的失穩(wěn)過程,具體可分為三個階段：第一階段,暴雨入滲,坡體飽和；第二階段,山洪暴發(fā),淘刷坡腳,前緣小范圍坍滑形成；第三階段,山洪繼續(xù)淘刷,發(fā)生大范圍坍滑,斜坡失穩(wěn)下滑。并由此得出電塔選址的幾點啟示。 4、對電塔塔基前緣拉裂變形區(qū)的坍滑殘留體進行了穩(wěn)定性及下滑推力的定量計算,為治理工程設計提供了依據(jù),得出在暴雨工況下殘留體是處于不穩(wěn)定狀態(tài)的,需要進行治理。 5、應用FLAC-3D數(shù)值計算方法對坍滑殘留體在天然和暴雨兩種工況下進行穩(wěn)定性和失穩(wěn)機理模擬分析。計算結果表明,滑坡殘留體在天然工況下位移量很小,處于穩(wěn)定狀態(tài),在暴雨工況下處于不穩(wěn)定狀態(tài),位移量較大,最大位移出現(xiàn)在前緣,殘留體深部出現(xiàn)貫通剪切帶。 6、根據(jù)上述對滑坡殘留體的分析與計算,結合滑坡的地形和交通條件,提出了兩種可行的治理方案,方案一為格構錨索框架梁,方案二為抗滑樁和裂縫封填工程�？紤]到交通條件、施工難度和工程擾動,綜合推薦格構錨索框架梁為G1002電塔塔基滑坡的治理方案。
[Abstract]:From August 29 to 30, 2012, heavy rain occurred inside and outside the construction area of Jinping I Hydropower Station, causing mass geological disasters. Local landslides occurred on the G1002 electric tower base slope on the left bank of Jinping I Hydropower Station, resulting in the bare hanging of the D leg of the electric tower. It poses a serious threat to the safety of the tower and the whole transmission line. On the basis of detailed field exploration, this paper deepens the engineering geological conditions of G1002 electric tower base landslide, divides the landslide, analyzes the forming conditions of landslide, restores the process of landslide occurrence, and probes into the forming mechanism of landslide. The stability of the residual body of landslide is calculated quantitatively by using the limit equilibrium method, and the process and mechanism of the stability and instability of the residual body of landslide are studied by numerical simulation. Two control schemes of landslide are put forward. By analyzing this typical example, this paper hopes to provide reference and reference for the location of electric tower in high mountain and canyon area. The main contents and results of the study are as follows: 1. According to the detailed site survey and deformation characteristics of landslide, the detailed characteristics of G1002 electric tower base landslide are introduced, and the characteristics of each area are introduced. 2. Through analyzing the engineering geological condition and hydrogeological condition of landslide, the forming conditions of landslide are summarized. The results show that steep topographic features, favorable rock mass and slope structure, scouring of slope foot by mountain torrents and continuous heavy rainfall are the key factors to induce landslide. 3. According to the engineering geological conditions and deformation characteristics of the landslide, the instability process of the landslide is reduced, which can be divided into three stages: the first stage, the infiltration of the rainstorm, the saturation of the slope body, the second stage, the flash floods, scouring the foot of the slope, In the third stage, the mountain torrents continue to scour and scour, resulting in large-scale collapse and slope instability. From this, the location of the tower several enlightenment. 4. The stability and sliding thrust of the residual body in the front crack deformation zone of the electric tower foundation are calculated quantitatively, which provides the basis for the design of the treatment project. It is concluded that the residual body is in an unstable state under the condition of heavy rain and needs to be treated. 5. The stability and instability mechanism of the residual body under natural and rainstorm conditions are simulated and analyzed by FLAC-3D numerical calculation method. The results show that the displacement of landslide remains is very small and stable under natural conditions, and unstable under rainstorm conditions, the maximum displacement appears in the front edge, and the through shear zone appears in the deep part of the residual body. 6. According to the above analysis and calculation of the landslide residual body, combined with the landform and traffic conditions of the landslide, two feasible treatment schemes are put forward, one is lattice anchor cable frame beam, the other is anti-slide pile and crack sealing project. Considering the traffic condition, construction difficulty and engineering disturbance, it is recommended that the frame beam of lattice Anchorage cable should be the control scheme of G1002 electric tower base landslide.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TV223

【參考文獻】

相關期刊論文 前10條

1 方建瑞;朱合華;蔡永昌;;邊坡穩(wěn)定性研究方法與進展[J];地下空間與工程學報;2007年02期

2 張倬元;滑坡防治工程的現(xiàn)狀與發(fā)展展望[J];地質災害與環(huán)境保護;2000年02期

3 許英姿,唐輝明;格構錨固措施及其在滑坡防治中的應用[J];地質科技情報;2001年02期

4 劉紅丹;毛朝亮;關永平;;邊坡穩(wěn)定性分析方法及數(shù)值模擬[J];水利與建筑工程學報;2010年03期

5 何曰毅;;220kV蘇崇線塔位滑坡治理[J];廣西電力;2011年06期

6 龔紀文,席先武,王岳軍,林舸;應力與變形的數(shù)值模型方法——數(shù)值模擬軟件FLAC介紹[J];華東地質學院學報;2002年03期

7 鄭穎人,趙尚毅,宋雅坤;有限元強度折減法研究進展[J];后勤工程學院學報;2005年03期

8 魏繼紅,吳繼敏,孫少銳;FLAC~(3D)在邊坡穩(wěn)定性分析中的應用[J];勘察科學技術;2005年02期

9 周振宇;;滑坡穩(wěn)定分析中傳遞系數(shù)法探討[J];路基工程;2007年04期

10 郭春陽;冷松柏;車淼;;抗滑樁與錨索在滑坡治理中的應用及比較[J];北方交通;2009年01期

，

本文編號：1808429