天水市水眼寨滑坡特征及稳定性分析
|
摘要
在对天水市水眼寨滑坡进行地质勘察和现场调查的基础上,结合区域环境研究滑坡的主要特征,分析地形条件、地层岩性、地质构造、地震、降水和人类活动对滑坡的影响,并利用GeoStudio计算软件,运用多种稳定性评价方法对滑坡静力和不同地震强度作用下的动力稳定性进行计算分析。结果表明,水眼寨滑坡属于黄土—泥岩滑坡,经过多期滑动,滑坡物质和滑坡体具有显著地平面分区性和剖面分层性,地层岩性和地质构造运动是其形成的主要内因,降水和地震是影响其稳定性重要外因。滑坡目前处于稳定状态,但未来环境变化会导致该滑坡稳定性降低,在Ⅶ度地震作用影响下该滑坡处于极限平衡状态,在Ⅶ度强以上地震作用影响下(>0.15g),该滑坡稳定性大为降低,存在复活的可能性。
On the basis of the geologic investigation and field survey,this paper studied the main characteristics of the 2013 Shuiyanzhai landslide;analyzed the influence of terrain conditions,formation lithology,geologic structure,earthquake,rainfall,and human activities on the landslide;and calculated the dynamic landslide stability of the analyzed formation under the simulated action of static forces and different earthquake intensities using GeoStudio software and a variety of stability evaluation methods.The results showed that the landslide originated in a giant loess of mudstone tractive type.Landslide material and landslide mass have significant regionalization in the plane and stratification in profile.Stratum lithology and tectonic movement are the main internal causes,whereas rainfall and earthquake are important external causes.The landslide area is currently in a steady state,but the stability can be reduced and even reactivated by environmental change in the future.The landslide is in a limited equilibrium state under aⅦ degree seismic action.Failures occurred in the region when horizontal peak ground accelerations(PGA)reached greater than 0.15 g.
On the basis of the geologic investigation and field survey,this paper studied the main characteristics of the 2013 Shuiyanzhai landslide;analyzed the influence of terrain conditions,formation lithology,geologic structure,earthquake,rainfall,and human activities on the landslide;and calculated the dynamic landslide stability of the analyzed formation under the simulated action of static forces and different earthquake intensities using GeoStudio software and a variety of stability evaluation methods.The results showed that the landslide originated in a giant loess of mudstone tractive type.Landslide material and landslide mass have significant regionalization in the plane and stratification in profile.Stratum lithology and tectonic movement are the main internal causes,whereas rainfall and earthquake are important external causes.The landslide area is currently in a steady state,but the stability can be reduced and even reactivated by environmental change in the future.The landslide is in a limited equilibrium state under aⅦ degree seismic action.Failures occurred in the region when horizontal peak ground accelerations(PGA)reached greater than 0.15 g.
引文
[1]钟秀梅,陈文凯,侯景瑞,等.汶川地震触发武都区和文县地质灾害发育特征研究[J].岩土工程学报,2011,33(S1):349-353.ZHONG Xiu-mei,CHEN Wen-kai,HOU Jing-rui,et al.Distribution Rules of Geo-hazards Induced by Wenchuan Earthquake[J].Chinese Journal of Geological Engineering,2011,33(S1):349-353.(in Chinese)
[2]吴玮江.天水市滑坡泥石流灾害[J].水文地质工程地质,2003(5):75-78.WU Wei-jiang.Landslide and Debris Flow Hazards in City of Tianshui[J].Hydrogeology&Engineering Geology,2003(5):75-78.(in Chinese)
[3]冯学才,陈瑾,白晓华,等.天水市居民繁居区活动滑坡特征及防灾减灾对策[J].甘肃科学学报,1992(3):60-68.FENG Xue-cai,CHEN Jin,BAI Xiao-hua,et al.The Characteristics of the Moving Landslides and Counter Measures for Contral and Disaster Prevention in the Densely Populated Area of Tianshui City,Gansu Province,China[J].Journal of Gansu Sciences,1992(3):60-68.(in Chinese)
[4]刘高,刘从友,王有林,等.黄河某水电站顺层岩质滑坡形成机理与演化过程[J].西北地震学报,2008,30(3):249-254.LIU Gao,LIU Cong-you,WANG You-lin,et al.Formation Mechanism and Evolution Process of the Consequent Rock Landslide in a Hydropower Station on the Yellow River[J].Northwestern Seismological Journal,2008,30(3):249-254.(in Chinese)
[5]张帆宇,刘高,邓建丽,等.甘肃G212线石阏子滑坡特征与演化机制[J].中国地质灾害与防治学报,2007,18(3):39-43.ZHANG Fan-yu,LIU Gao,DENG Jian-li,et al.Characteristics and Evolution Mechanism of Shi’ezi Landslide in Gansu Province Section of G212 Highway[J].The Chinese Journal of Geological Hazard and Control,2007,18(3):39-43.(in Chinese)
[6]王家鼎,张倬元.地震诱发高速黄土滑坡的机理研究[J].岩土工程学报,1999,21(6):670-674.WANG Jia-ding,ZHANG Zhuo-yuan.A Study on the Mechanism of High-speed Loess Landslide Induced by Earthquake[J].Chinese Journal of Geological Engineering,1999,21(6):670-674.(in Chinese)
[7]王谦,袁中夏,王兰民,等.汶川地震后甘肃临夏北塬黄土场地大面积沉陷研究[J].西北地震学报,2012,34(2):180-185.WANG Qian,YUAN Zhong-xia,WANG Lan-min,et al.Study on Large Scale Subsidence of Loess Site After Wenchuan MS8.0Earthquake in Beiyuan,Linxia County,Gansu Province[J].Northwestern Seismological Journal,2012,34(2):180-185.(in Chinese)
[8]卓莉,何江达,谢红强,等.不同边界和地基条件的大型滑坡体动力响应分析[J].岩土力学,2012,33(11):2419-3425.ZHUO Li,HE Jiang-da,XIE Hong-qiang,et al.Research on Seismic Response of Large-slipmasa Based on Different Boundary Condition and Foundation Conditions[J].Rock and Soil Mechanice,2012,33(11):3419-3425.(in Chinese)
[9]徐舜华,吴志坚,孙军杰,等.岷县漳县6.6级地震典型滑坡特征及其诱发机制[J].地震工程学报,2013,35(3):471-476.XU Shun-hua,WU Zhi-jian,SUN Jun-jie,et al.Study on the Characteristics and Inducing Mechanism of Typical Earthquake Landslides of the Minxian-Zhangxian MS6.6Earthquake[J].China Earthquake Engineering Journal,2013,35(3):471-476.(in Chinese)
[2]吴玮江.天水市滑坡泥石流灾害[J].水文地质工程地质,2003(5):75-78.WU Wei-jiang.Landslide and Debris Flow Hazards in City of Tianshui[J].Hydrogeology&Engineering Geology,2003(5):75-78.(in Chinese)
[3]冯学才,陈瑾,白晓华,等.天水市居民繁居区活动滑坡特征及防灾减灾对策[J].甘肃科学学报,1992(3):60-68.FENG Xue-cai,CHEN Jin,BAI Xiao-hua,et al.The Characteristics of the Moving Landslides and Counter Measures for Contral and Disaster Prevention in the Densely Populated Area of Tianshui City,Gansu Province,China[J].Journal of Gansu Sciences,1992(3):60-68.(in Chinese)
[4]刘高,刘从友,王有林,等.黄河某水电站顺层岩质滑坡形成机理与演化过程[J].西北地震学报,2008,30(3):249-254.LIU Gao,LIU Cong-you,WANG You-lin,et al.Formation Mechanism and Evolution Process of the Consequent Rock Landslide in a Hydropower Station on the Yellow River[J].Northwestern Seismological Journal,2008,30(3):249-254.(in Chinese)
[5]张帆宇,刘高,邓建丽,等.甘肃G212线石阏子滑坡特征与演化机制[J].中国地质灾害与防治学报,2007,18(3):39-43.ZHANG Fan-yu,LIU Gao,DENG Jian-li,et al.Characteristics and Evolution Mechanism of Shi’ezi Landslide in Gansu Province Section of G212 Highway[J].The Chinese Journal of Geological Hazard and Control,2007,18(3):39-43.(in Chinese)
[6]王家鼎,张倬元.地震诱发高速黄土滑坡的机理研究[J].岩土工程学报,1999,21(6):670-674.WANG Jia-ding,ZHANG Zhuo-yuan.A Study on the Mechanism of High-speed Loess Landslide Induced by Earthquake[J].Chinese Journal of Geological Engineering,1999,21(6):670-674.(in Chinese)
[7]王谦,袁中夏,王兰民,等.汶川地震后甘肃临夏北塬黄土场地大面积沉陷研究[J].西北地震学报,2012,34(2):180-185.WANG Qian,YUAN Zhong-xia,WANG Lan-min,et al.Study on Large Scale Subsidence of Loess Site After Wenchuan MS8.0Earthquake in Beiyuan,Linxia County,Gansu Province[J].Northwestern Seismological Journal,2012,34(2):180-185.(in Chinese)
[8]卓莉,何江达,谢红强,等.不同边界和地基条件的大型滑坡体动力响应分析[J].岩土力学,2012,33(11):2419-3425.ZHUO Li,HE Jiang-da,XIE Hong-qiang,et al.Research on Seismic Response of Large-slipmasa Based on Different Boundary Condition and Foundation Conditions[J].Rock and Soil Mechanice,2012,33(11):3419-3425.(in Chinese)
[9]徐舜华,吴志坚,孙军杰,等.岷县漳县6.6级地震典型滑坡特征及其诱发机制[J].地震工程学报,2013,35(3):471-476.XU Shun-hua,WU Zhi-jian,SUN Jun-jie,et al.Study on the Characteristics and Inducing Mechanism of Typical Earthquake Landslides of the Minxian-Zhangxian MS6.6Earthquake[J].China Earthquake Engineering Journal,2013,35(3):471-476.(in Chinese)
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心