宁镇地区山前缓坡地层结构及其稳定性分析
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摘要
近年来由于受极端强降雨天气的影响,宁镇地区山前缓坡发生多起中型-大型滑坡地质灾害,主要表现为间歇性蠕滑,规模较大,而滑移距离较小,一般小于30 m,该类滑坡严重威胁附近居民的生命和财产安全,造成巨大的经济损失和严重不良社会影响。为此,本文针对这一典型山前缓坡新型滑坡地质灾害,运用岩体结构控制论和优势面理论对其滑坡体地层结构及滑动机理进行研究,结果表明滑坡主要发生在山前缓坡地段,滑坡体具有特殊的地层结构及水文地质特性,受到强降雨作用时,在坡体内容易产生暂时性承压水,在其浮托力的作用下缓坡主要产生顶托破裂和剪切破坏,并随降雨产生间歇性蠕滑。
In recent years,due to the influence of extreme heavy rainfall weather,many medium-sized and largescale landslides had occurred on the gentle slopes of Ningzhen area. These landslides were mainly manifesting intermittent creep,large scale,and small slip distance,generally less than 30 m,which seriously threatens the safety of lives and property of residents,and causes huge economic losses and serious adverse social effects. In the paper,based on this new type of landslide geological hazard,the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rock mass structure and preferred plane theory. The results show that the landslide mainly occurred in the Piedmont gentle slope area,and there are special stratum structure and hydrogeological characteristics of the landslide body. The confined water would be easily produced in the slope body with heavy rainfall. Under the action of buoyancy of confined water,the burst and shear failure would produce mainly in the gentle slope,and the intermittent creep of the landslide grow with rainfall.
In recent years,due to the influence of extreme heavy rainfall weather,many medium-sized and largescale landslides had occurred on the gentle slopes of Ningzhen area. These landslides were mainly manifesting intermittent creep,large scale,and small slip distance,generally less than 30 m,which seriously threatens the safety of lives and property of residents,and causes huge economic losses and serious adverse social effects. In the paper,based on this new type of landslide geological hazard,the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rock mass structure and preferred plane theory. The results show that the landslide mainly occurred in the Piedmont gentle slope area,and there are special stratum structure and hydrogeological characteristics of the landslide body. The confined water would be easily produced in the slope body with heavy rainfall. Under the action of buoyancy of confined water,the burst and shear failure would produce mainly in the gentle slope,and the intermittent creep of the landslide grow with rainfall.
引文
Gu D Z.1963.Geological structure and engineering construction[J].Chinese Science Bulletin,(10):23-29.
Gu D Z,Huang D C.1979.Classification of rock mass structure and determination of quality factor[J].Hydrogeology and Engineering Geology,2(2):7-13.
Gu D Z.1979.Basic problems of engineering geomechanics of rock mass[C]//Engineering Geology Commission,China Geology Society.Proceedings of First National Engineering Geology Congress.Beijing:Engineering Geology Commission,China Geology Society:8.
Luo G Y,Wang P Q,Cai Z Y,et al.1982.On the concept of two preferred planes and its analysis methods[J].Chinese Journal of Geotechnical Engineering,4(2):57-65.
Luo G Y,Liu S Y,Yang W D.1992.Analysis of regional stability by theory of preferred plane[J].Chinese Journal of Geotechnical Engineering,14(6):10-17.
Luo G Y,Yan C H,Li X Z.2002.Engineering geology in China:reviews and prospects at the beginning of the new century[J].Journal of Engineering Geology,10(1):3-9.
Sun G Z,Zhang W B.1985.A commonly-sighted rock mass structureSlab-rent structure and its mechanical model[J].Scentia Geologica Sinica,(3):275-282.
Sun G Z.1992.Mechanics of rock mass structure[J].Advance in Earth Sciences,7(1):87-89.
Sun G Z.1993.On the theory of structure-controlled rockmass[J].Journal of Engineering Geology,First Issue:14-18.
谷德振.1963.地质构造与工程建设[J].科学通报,(10):23-29.
谷德振.1979.论岩体工程地质力学的基本问题[C]//中国地质学会工程地质专业委员会.全国首届工程地质学术会议论文选集.北京:中国地质学会工程地质专业委员会:8.
谷德振,黄鼎成.1979.岩体结构的分类及其质量系数的确定[J].水文地质工程地质,2(2):7-13.
罗国煜,王培清,蔡钟业,等.1982.论边坡2类优势面的概念及其研究方法[J].岩土工程学报,4(2):57-65.
罗国煜,刘松玉,杨卫东.1992.区域稳定性优势面分析理论与方法[J].岩土工程学报,14(6):10-17.
罗国煜,阎长虹,李晓昭.2002.新世纪伊始中国工程地质回顾与展望[J].工程地质学报,10(1):3-9.
孙广忠,张文彬.1985.一种常见的岩体结构---板裂结构及其力学模型[J].地质科学,(3):275-282.
孙广忠.1992.岩体结构力学[J].地球科学进展,7(1):87-89.
孙广忠.1993.论“岩体结构控制论”[J].工程地质学报,创刊号:14-18.
Gu D Z,Huang D C.1979.Classification of rock mass structure and determination of quality factor[J].Hydrogeology and Engineering Geology,2(2):7-13.
Gu D Z.1979.Basic problems of engineering geomechanics of rock mass[C]//Engineering Geology Commission,China Geology Society.Proceedings of First National Engineering Geology Congress.Beijing:Engineering Geology Commission,China Geology Society:8.
Luo G Y,Wang P Q,Cai Z Y,et al.1982.On the concept of two preferred planes and its analysis methods[J].Chinese Journal of Geotechnical Engineering,4(2):57-65.
Luo G Y,Liu S Y,Yang W D.1992.Analysis of regional stability by theory of preferred plane[J].Chinese Journal of Geotechnical Engineering,14(6):10-17.
Luo G Y,Yan C H,Li X Z.2002.Engineering geology in China:reviews and prospects at the beginning of the new century[J].Journal of Engineering Geology,10(1):3-9.
Sun G Z,Zhang W B.1985.A commonly-sighted rock mass structureSlab-rent structure and its mechanical model[J].Scentia Geologica Sinica,(3):275-282.
Sun G Z.1992.Mechanics of rock mass structure[J].Advance in Earth Sciences,7(1):87-89.
Sun G Z.1993.On the theory of structure-controlled rockmass[J].Journal of Engineering Geology,First Issue:14-18.
谷德振.1963.地质构造与工程建设[J].科学通报,(10):23-29.
谷德振.1979.论岩体工程地质力学的基本问题[C]//中国地质学会工程地质专业委员会.全国首届工程地质学术会议论文选集.北京:中国地质学会工程地质专业委员会:8.
谷德振,黄鼎成.1979.岩体结构的分类及其质量系数的确定[J].水文地质工程地质,2(2):7-13.
罗国煜,王培清,蔡钟业,等.1982.论边坡2类优势面的概念及其研究方法[J].岩土工程学报,4(2):57-65.
罗国煜,刘松玉,杨卫东.1992.区域稳定性优势面分析理论与方法[J].岩土工程学报,14(6):10-17.
罗国煜,阎长虹,李晓昭.2002.新世纪伊始中国工程地质回顾与展望[J].工程地质学报,10(1):3-9.
孙广忠,张文彬.1985.一种常见的岩体结构---板裂结构及其力学模型[J].地质科学,(3):275-282.
孙广忠.1992.岩体结构力学[J].地球科学进展,7(1):87-89.
孙广忠.1993.论“岩体结构控制论”[J].工程地质学报,创刊号:14-18.