鲁甸王家坡强变形区地表破裂机制和斜坡稳定性研究

发布时间：2018-01-01 01:11

本文关键词：鲁甸王家坡强变形区地表破裂机制和斜坡稳定性研究　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国西南地区地震频繁、地质条件复杂,但水力资源极其丰富。在经济相对落后的西南地区,水力建设是支撑其区域经济发展的战略措施,同时也承担了整个国民经济命脉的角色。水电工程的建设多处于深切峡谷区,地质地理环境脆弱、地质施工条件苛刻,施工建设过程中显现过许多严重的工程地质问题,威胁着整个水电工程的施工与运营和周区的人身安全与经济建设。地震在高山丘陵地区主要诱发滑坡、崩塌、泥石流等斜坡次生地质灾害,震裂山体是震后潜在地质灾害的物质基础,震后的地质灾害问题逐渐显著,特别是在水电工程区域极易引发的规模大、危害大的地质灾害。2014年8月3日16时,云南省鲁甸县发生了6.5级左右的地震,引发许多严重的滑坡崩塌等地质类灾害,造成严重的经济损失和人员伤亡。红石岩水电枢纽工程上游王家坡EN侧受地震扰动较为剧烈,地表破裂严重,变形较大,对整个水电工程建设和运行造成严重的威胁。本文以震后王家坡强变形区为研究对象,对强变形区的地表破裂特征、物质组成和岩体结构特征进行详细调查和分析,较为系统的对强变形区的地表破裂机制和斜坡稳定性进行了分析。主要研究内容与成果如下:(1)王家坡强变形区地表破裂共72条,对每一条地表破裂的起始点坐标、延伸方向、长度、宽度、可见深度、下错高度和破裂充填的地质灾害进行分析和诊断,整理出此地地表破裂带的规律。(2)通过现场详细地质勘查、钻孔和平硐编录资料,得出强变形区较为准确的物质组成分析和岩体结构分类。(3)对强变形区地表破裂机制分析,认为导致地表破裂的原因主要为地形地貌、岩土体结构条件、地震动力响应、持续降雨和后期累积效应。(4)结合地表位移监测数据和运用FLAC3D数值方法对强变形区边坡进行了天然、暴雨和地震工况下稳定性分析,FLAC3D模型计算结果表明变形都只存在于断层带全~强风化岩体的浅表部和H2残留后壁部分,变形量与监测数据和现场定性判断情况基本吻合,斜坡的变形破坏主要受到断层带的影响,属于斜坡表层岩体局部的溜滑,并不存在整体稳定性问题。
[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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P642.2

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