碎裂结构边坡变形机理及治理对策研究
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摘要
碎裂结构边坡稳定性受多组相交结构面控制,且受降雨、地震等多因素影响强烈,具有一定的特殊性。本文以某花岗岩碎裂结构边坡为例,在边坡的地质条件和岩体结构研究的基础上,结合施工及监测反馈信息,深入分析了边坡变形破坏模式,并根据稳定性计算结果,提出锚索、钢筋桩与排水相结合的支护方案。研究结果表明:坡体内部陡倾卸荷裂缝发育形成后缘切割面,中下部滑面追踪陡缓两组结构面发展;支护措施实施后,边坡经历"5.12"地震及雨季,多点位移计监测结果表明,地震和降雨对边坡稳定性影响较大,支护措施较好地控制了边坡变形。
The stability of rock slope with cataclastic texture is controlled by joints that are crossed each other,and affected by terrain,rainfall and other factors.This paper presents a case study on the stability of a granitic rock slope with broken and cataclastic structures.The geological condition and the rockmass structure properties were investigated in detail.This study further took into account the data that are revealed during construction and monitoring of the slope.It thoroughly analyzed the slope deformation mechanism during the excavating.On the basis of the slope stability results,it suggested the stabilization measures.The results show that the slip surface in top of the slope was formed by unloading cracks.The other slip surfaces were developed under the effects of two groups of structural planes.In particular,the multi-point extensometers buried in the slope recorded the slope deformation characteristics during the 5.12 Wenchuan Earthquake and afterward railfalls.Then after the supporting,the slope deformation was obviously under the control.
The stability of rock slope with cataclastic texture is controlled by joints that are crossed each other,and affected by terrain,rainfall and other factors.This paper presents a case study on the stability of a granitic rock slope with broken and cataclastic structures.The geological condition and the rockmass structure properties were investigated in detail.This study further took into account the data that are revealed during construction and monitoring of the slope.It thoroughly analyzed the slope deformation mechanism during the excavating.On the basis of the slope stability results,it suggested the stabilization measures.The results show that the slip surface in top of the slope was formed by unloading cracks.The other slip surfaces were developed under the effects of two groups of structural planes.In particular,the multi-point extensometers buried in the slope recorded the slope deformation characteristics during the 5.12 Wenchuan Earthquake and afterward railfalls.Then after the supporting,the slope deformation was obviously under the control.
引文
[1]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.Zhang Zhuoyuan,Wang Shitian,Wang Lansheng.Fundamental a-nalysis of engineering geology.Beijing:Geological PublishingHouse,1994.
[2]黄润秋,张倬元,王士天.高边坡稳定性的系统工程地质研究[M].成都:成都科技大学出版社,1991.Huang Runqiu,Zhang Zhuoyuan,Wang Shitian.System study ofengineering geology in stability of high-sploe.Chengdu:Univer-sity of Science and Technology of Chengdu Press,1991.
[3]黄润秋.岩石高边坡发育的动力过程及其稳定性控制[J].岩石力学与工程学报,2008,8(8):1~21.Huang Runqiu.Geodynamical process and stability control of highrock slope development.Chinese Journal of Rock Mechanics andEngineering August,2008,8(8):1~21.
[4]巨能攀等.黄山高速滑移弯曲边坡变形机理分析及应急治理对策[J].地球科学进展,2008,5(5):474~481.Ju Nengpan.Analysis of deformation of sliding to bending slopeand study of deformation emergency control at Huangshan express-way.Advances in Earth Science May,2008,5(5):474~481.
[5]赵建军等.下伏软弱黄土边坡变形机制分析及治理对策研究[J].工程地质学报,2006,14(6):743~748.(Zhao Jianjun.Deformation mechanism of loess slope with weakinterlayer and its stabilization measures.Journal of EngineeringGeology,2006,14(6):743~748.
[6]中国地震局.汶川8.0级地震烈度分布图[S],2008.China Earthquake Administration Earthquake.Intensity graphics ofWenchuan 8.0 Earthquake,2008.
[7]曹兴松.碎裂岩体路堑高边坡失稳机理及防治技术研究[D].西南交通大学,2006.Cao Xingsong.Research on instability mechanism and controllingtechniques for cutting high slope in disintegration rock mass.Southwest Jiaotong University,2006.
[2]黄润秋,张倬元,王士天.高边坡稳定性的系统工程地质研究[M].成都:成都科技大学出版社,1991.Huang Runqiu,Zhang Zhuoyuan,Wang Shitian.System study ofengineering geology in stability of high-sploe.Chengdu:Univer-sity of Science and Technology of Chengdu Press,1991.
[3]黄润秋.岩石高边坡发育的动力过程及其稳定性控制[J].岩石力学与工程学报,2008,8(8):1~21.Huang Runqiu.Geodynamical process and stability control of highrock slope development.Chinese Journal of Rock Mechanics andEngineering August,2008,8(8):1~21.
[4]巨能攀等.黄山高速滑移弯曲边坡变形机理分析及应急治理对策[J].地球科学进展,2008,5(5):474~481.Ju Nengpan.Analysis of deformation of sliding to bending slopeand study of deformation emergency control at Huangshan express-way.Advances in Earth Science May,2008,5(5):474~481.
[5]赵建军等.下伏软弱黄土边坡变形机制分析及治理对策研究[J].工程地质学报,2006,14(6):743~748.(Zhao Jianjun.Deformation mechanism of loess slope with weakinterlayer and its stabilization measures.Journal of EngineeringGeology,2006,14(6):743~748.
[6]中国地震局.汶川8.0级地震烈度分布图[S],2008.China Earthquake Administration Earthquake.Intensity graphics ofWenchuan 8.0 Earthquake,2008.
[7]曹兴松.碎裂岩体路堑高边坡失稳机理及防治技术研究[D].西南交通大学,2006.Cao Xingsong.Research on instability mechanism and controllingtechniques for cutting high slope in disintegration rock mass.Southwest Jiaotong University,2006.
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