某水电站地应力场数值模拟与工程区稳定性分析
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摘要
根据黄河上游某水电站地下厂房区工程地质勘探资料和原地应力测量资料,用Marc Mentat软件建立了有限元计算模型。利用应力回归分析方法模拟该地区地应力场:首先确定自重和构造应力因素为待回归因素,然后采用回归法原理计算待回归因素的系数,从而模拟出工程区地应力场。对比实测值和模拟值,表明两者在数值和方位上差距均不大。厂房区附近最大主应力值为8MPa左右,最大水平应力近东西向。重力作用对该区地应力的影响要大于构造应力的作用。反演获得的规律与预先推测的结果基本一致。反演结果表明该水电站地下厂房的稳定性较好。
According to the data from engineering geological exploration and in-situ stress measurement of a hydropower station at the upper Yellow River,we establish a finite element model using Marc Mentat software.With stress regression analysis method,we model the stress field in the study region: Firstly,we confirm self-gravity and tectonic stress as the undetermined regression parameters;then regress the correlated coefficients according to regression theory;finally calculate the stress field of project region.Comparing in-situ measurement data and the calculated results,we find out that there are little difference between them both in magnitude and orientation.The maximum principle stresses near powerhouse are about 8MPa.The orientation of maximum horizontal stress approaches E-W.The effect of self-gravity on the stress field is more than that of tectonic stress in the region.The features displayed in our inversion results are broadly in line with our expectation.The inversion results show that the stability of powerhouse is great.
According to the data from engineering geological exploration and in-situ stress measurement of a hydropower station at the upper Yellow River,we establish a finite element model using Marc Mentat software.With stress regression analysis method,we model the stress field in the study region: Firstly,we confirm self-gravity and tectonic stress as the undetermined regression parameters;then regress the correlated coefficients according to regression theory;finally calculate the stress field of project region.Comparing in-situ measurement data and the calculated results,we find out that there are little difference between them both in magnitude and orientation.The maximum principle stresses near powerhouse are about 8MPa.The orientation of maximum horizontal stress approaches E-W.The effect of self-gravity on the stress field is more than that of tectonic stress in the region.The features displayed in our inversion results are broadly in line with our expectation.The inversion results show that the stability of powerhouse is great.
引文
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[2]崔效峰,谢富仁,张红艳.川滇地区现代构造应力场分区及动力学意义.[J]地震学报,2006,28(5):451-461.
[3]谢富仁,李宏.利用断层滑动资料确定鲜水河断裂带现代构造应力的方向和大小[J].地震学报,1995,17(2):164-171.
[4]愈言祥,许忠淮.利用斜井钻孔崩落资料反演冀中坳陷上地壳应力状态[J].地震学报,1996,16(2):246-253.
[5]郭伟杰,龚成,李晶.地应力测量方法及其需要注意的问题[J].价值工程,2010,29(25):136-137.
[6]陈秀铜,李璐.锦屏二级水电站引水隧洞区域三维初始地应力场反演回归分析[J].水文地质工程地质,2007,34(6):55-58,75.
[7]杨云浩,徐卫亚,聂卫平.糯扎渡水电站厂房区三维地应力场反演分析[J].人民长江,2010,41(7):52-57.
[8]YANG Shu-xin,XUZhaoyi,BAI Mingzhou,et al.The method of bound regression analyse of the initial geostress field and its application[C]//Rock stress and earthquakes.CRC,2010:665-672.
[9]陈连旺,张培震,陆远忠.川滇地区强震序列库仑破裂应力加卸载效应的数值模拟[J].地球物理学报,2008,51(5):1411-1421.
[10]李山有,马强,武东坡,等.断层场地地震反应特征研究[J].地震工程与工程振动,2003,23(5):32-37.
[11]杨保存,邱林.岩体地应力及其测量方法综述[J].科技信息,2009(6):59-60.
[12]肖本职.广西岩滩水电站地下厂房区地应力测试与分析[J].长江科学院院报,2008,25(1):65-69.
[13]孙有为,薄景山,李平,等.地震对地下硐室围岩动压力的影响[J].地震工程与工程振动,2010,(3):171-177.
[14]马振洲,李连杰.中部城市引松供水工程引水隧洞岩爆问题预测[J].吉林水利,2009,11(330):1-4.
[15]沈习文,吴永安,聂大丰,等.双江口水电站右岸低线公路2号隧道岩爆特征及其防治措施[J].水电站设计,2010,26(3):106-107,110.
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