本文關鍵詞：魯?shù)橥跫移聫娮冃螀^(qū)地表破裂機制和斜坡穩(wěn)定性研究　出處：《吉林大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 震裂山體 地表破裂 成因機制 數(shù)值模擬 穩(wěn)定性評價

【摘要】：我國西南地區(qū)地震頻繁、地質(zhì)條件復雜,但水力資源極其豐富。在經(jīng)濟相對落后的西南地區(qū),水力建設是支撐其區(qū)域經(jīng)濟發(fā)展的戰(zhàn)略措施,同時也承擔了整個國民經(jīng)濟命脈的角色。水電工程的建設多處于深切峽谷區(qū),地質(zhì)地理環(huán)境脆弱、地質(zhì)施工條件苛刻,施工建設過程中顯現(xiàn)過許多嚴重的工程地質(zhì)問題,威脅著整個水電工程的施工與運營和周區(qū)的人身安全與經(jīng)濟建設。地震在高山丘陵地區(qū)主要誘發(fā)滑坡、崩塌、泥石流等斜坡次生地質(zhì)災害,震裂山體是震后潛在地質(zhì)災害的物質(zhì)基礎,震后的地質(zhì)災害問題逐漸顯著,特別是在水電工程區(qū)域極易引發(fā)的規(guī)模大、危害大的地質(zhì)災害。2014年8月3日16時,云南省魯?shù)榭h發(fā)生了6.5級左右的地震,引發(fā)許多嚴重的滑坡崩塌等地質(zhì)類災害,造成嚴重的經(jīng)濟損失和人員傷亡。紅石巖水電樞紐工程上游王家坡EN側受地震擾動較為劇烈,地表破裂嚴重,變形較大,對整個水電工程建設和運行造成嚴重的威脅。本文以震后王家坡強變形區(qū)為研究對象,對強變形區(qū)的地表破裂特征、物質(zhì)組成和巖體結構特征進行詳細調(diào)查和分析,較為系統(tǒng)的對強變形區(qū)的地表破裂機制和斜坡穩(wěn)定性進行了分析。主要研究內(nèi)容與成果如下:(1)王家坡強變形區(qū)地表破裂共72條,對每一條地表破裂的起始點坐標、延伸方向、長度、寬度、可見深度、下錯高度和破裂充填的地質(zhì)災害進行分析和診斷,整理出此地地表破裂帶的規(guī)律。(2)通過現(xiàn)場詳細地質(zhì)勘查、鉆孔和平硐編錄資料,得出強變形區(qū)較為準確的物質(zhì)組成分析和巖體結構分類。(3)對強變形區(qū)地表破裂機制分析,認為導致地表破裂的原因主要為地形地貌、巖土體結構條件、地震動力響應、持續(xù)降雨和后期累積效應。(4)結合地表位移監(jiān)測數(shù)據(jù)和運用FLAC3D數(shù)值方法對強變形區(qū)邊坡進行了天然、暴雨和地震工況下穩(wěn)定性分析,FLAC3D模型計算結果表明變形都只存在于斷層帶全~強風化巖體的淺表部和H2殘留后壁部分,變形量與監(jiān)測數(shù)據(jù)和現(xiàn)場定性判斷情況基本吻合,斜坡的變形破壞主要受到斷層帶的影響,屬于斜坡表層巖體局部的溜滑,并不存在整體穩(wěn)定性問題。
[Abstract]:The southwest of China is characterized by frequent earthquakes and complicated geological conditions, but its hydraulic resources are extremely rich. In the southwest region, where the economy is relatively backward, hydraulic construction is a strategic measure to support the regional economic development. At the same time, it also takes the role of the lifeblood of the whole national economy. The construction of hydropower projects is mostly in the deep canyon area, the geological and geographical environment is fragile, and the geological construction conditions are harsh. During the construction process, many serious engineering geological problems have appeared, which threaten the construction and operation of the whole hydropower project and the personal safety and economic construction of the surrounding area. The earthquake mainly induces landslides and collapses in the mountainous and hilly areas. Debris flow and other slope secondary geological disasters, seismic crack mountain is the material basis of potential geological disasters after the earthquake, the geological hazards after the earthquake is gradually significant, especially in the hydropower project area easily triggered by the large scale. At 16:00 on August 3rd 2014, an earthquake of magnitude 6.5 occurred in Ludian County, Yunnan Province, which caused many serious geological disasters such as landslide collapse and so on. It has caused serious economic losses and casualties. In the upstream of Hongshiyan Hydropower Project, the en side of Wangjiapo is severely disturbed by the earthquake, the surface rupture is serious, and the deformation is large. This paper takes the strong deformation area of Wangjiapo after earthquake as the research object, and gives the surface rupture characteristics of the strong deformation area. The material composition and rock mass structure characteristics are investigated and analyzed in detail. The surface rupture mechanism and slope stability of strong deformation area are systematically analyzed. The main research contents and results are as follows: 1) there are 72 surface fractures in strong deformation area of Wangjiapo. The starting point coordinates, extension direction, length, width, visible depth, fault height and geological hazards of each surface rupture are analyzed and diagnosed. Sorting out the rules of the surface rupture zone in this area. (2) through the detailed geological survey on the spot, we can drill holes and record the data of the cave. It is concluded that the more accurate analysis of material composition and classification of rock mass structure in the area of strong deformation and the analysis of the mechanism of surface rupture in the area of strong deformation, it is considered that the main causes of surface rupture are topography and geomorphology, and the structural conditions of rock and soil. Seismic dynamic response, continuous rainfall and late cumulative effect. 4) combined with surface displacement monitoring data and FLAC3D numerical method, the slope in strong deformation area is natural. Stability analysis under torrential rain and earthquake conditions the results of FLAC3D model show that the deformation only exists in the shallow part of the whole ~ strong weathered rock body and the residual back wall of H _ 2 in the fault zone. The deformation is basically consistent with the monitoring data and the field qualitative judgment. The deformation and failure of the slope is mainly affected by the fault zone, which belongs to the local slip of the slope surface rock mass, and there is no overall stability problem.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P642.2

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