南江县坪河乡九义校滑坡稳定性分析
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摘要
巴中市南江县九义校滑坡为一老滑坡堆积体,"5.12"地震期间发生复活滑动变形出现拉裂缝。近期该滑坡在暴雨状态下再次出现变形迹象,坡体的稳定性进一步降低,严重威胁其下的居民生命财产安全。文章通过野外调研和搜集现有资料,系统地分析了该滑坡的地质环境和滑坡特征。根据坡体的结构及形态特征研究了滑坡的形成机制,判定九义校滑坡为牵引式土质滑坡,破坏模式为蠕滑拉裂。最后分析各工况的影响因素,并运用传递系数法进行滑坡稳定性验算,得出稳定性计算成果,内聚力c值和内摩擦角φ值的变化对安全系数K的影响。经过稳定性分析计算说明,该滑坡在天然工况下整体稳定性较好,在暴雨下处于欠稳定状态,易产生整体滑动,说明降雨无疑对滑坡的形成发展起到了至关重要的作用。为了防止雨季期间雨水下渗降低坡体稳定性,造成滑坡土体失稳或局部溜滑变形破坏,威胁危险区内人民的生命财产安全,建议尽快开展该地质灾害体的工程防治。
The landslide body located in Jiuyi School of Nanjiang County of Bazhong City is old one;It was active during "5.12" Earthquake,and tensile cracks were created.In the recent period,it appeared deformation and slide indication,the stability gradually being worse,which threat seriously to the safety of lives and property of the residents.This article systematically analyzes the geological environment of landslide and its features by field research and data collection.According to the structural and morphological characteristics of the slope,the formation mechanism of the landslide was researched;The research shows that the landslide has a traction soil landslide and the failure mode would be the creep crack.Finally,the impact factors of various conditions were analyzed,the landslide stability was checked by the transfer coefficient method,and the calculation has shown that the impact of cohesion C value and the internal friction angle φ changes on the safety factor K.The stability calculation analysis instructions that the landslide stability overall is better under natural conditions,but it would be unstable and easy to produce the overall slide in a rainstorm.It shows the rains undoubtedly played a crucial role in the formation and development of the landslide.In order to prevent stormwater infiltration during the rainy season to reduce slope stability,resulting in the Landslide instability or the local slippery deformation destruction,threaten the safety of the lives and property of local people,the engineering prevention as soon as possible was proposed.
The landslide body located in Jiuyi School of Nanjiang County of Bazhong City is old one;It was active during "5.12" Earthquake,and tensile cracks were created.In the recent period,it appeared deformation and slide indication,the stability gradually being worse,which threat seriously to the safety of lives and property of the residents.This article systematically analyzes the geological environment of landslide and its features by field research and data collection.According to the structural and morphological characteristics of the slope,the formation mechanism of the landslide was researched;The research shows that the landslide has a traction soil landslide and the failure mode would be the creep crack.Finally,the impact factors of various conditions were analyzed,the landslide stability was checked by the transfer coefficient method,and the calculation has shown that the impact of cohesion C value and the internal friction angle φ changes on the safety factor K.The stability calculation analysis instructions that the landslide stability overall is better under natural conditions,but it would be unstable and easy to produce the overall slide in a rainstorm.It shows the rains undoubtedly played a crucial role in the formation and development of the landslide.In order to prevent stormwater infiltration during the rainy season to reduce slope stability,resulting in the Landslide instability or the local slippery deformation destruction,threaten the safety of the lives and property of local people,the engineering prevention as soon as possible was proposed.
引文
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[2]王恭先,徐峻龄,刘光代,等.滑坡学与滑坡防治技术[M].北京:中国铁道出版社,2004:94-106.
[3]李园.四川南江某滑坡特征及形成机制分析[J].四川建筑,2008,28(3):82-83.
[4]黄润秋.20世纪以来中国的大型滑坡及其发生机制[J].岩石力学与工程学报,2007,26(3):433-455.
[5]周海清,刘东升,陈正汉,等.基于传递系数法的滑面指标反算方法的研究[J].地下空间与工程学报,2010,6(6):1161-1167.
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