四川寧南縣白水河高位牽引式滑坡變形破壞機理及其災害鏈研究
發(fā)布時間：2018-12-13 15:53
【摘要】：四川省涼山州地區(qū)受地質構造、河流切割等因素影響,地形起伏較大,地形坡度陡,多呈“V”型高山峽谷地貌。受地形影響,區(qū)域內小氣候特征明顯,短歷時的集中強降雨頻發(fā),導致涼山州區(qū)內的滑坡、泥石流災害極易發(fā)生。2012年6月27日至6月28日,寧南縣境內普降大暴雨,導致縣域內發(fā)生大量的滑坡、泥石流災害,造成了一定的人員傷亡、公路掩埋等。也造成了普格至寧南縣S212省道內側的斜坡發(fā)生滑動,約有20多萬方的滑坡物質剪出后在重力作用下順坡體溝道沖向坡腳,形成的堆積體堵斷公路。2012年8月16日再次發(fā)生大規(guī)�；瑒�,達70余萬方滑體剪出后流向坡腳河床,崩塌造成過往人員死亡2人、失蹤3人,公路阻斷長達600余米,堵塞黑水河河道100余米、河水位突然上漲近4米形成堰塞湖,阻斷交通15天�；轮苯油{滑坡體上居住的179人的生命財產安全,特別是滑坡范圍內的14戶70余人。間接威脅黑水河下游沿岸眾多廠礦、電站等資產近8億元及近2萬人人員的生命財產安全。因此,對該高位牽引式滑坡開展工程治理非常必要而緊迫。四川寧南縣白水河高位牽引式滑坡位于黑水河右岸,滑坡在平面上整體呈“鏟狀”。該滑坡位于高陡的峽谷地貌區(qū),滑坡地形上緩下陡,為滑坡的形成提供了臨空條件；另一方面,陡緩交界的容易形成應力集中,坡腳剪應力集中超過其抗剪強度,在坡腳部位首先發(fā)生剪切破壞,且破壞將向坡體內部發(fā)展�；聟^(qū)受到則木河斷裂的影響,滑坡區(qū)巖體產狀變化較大,小型構造較為發(fā)育,巖體較為破碎。根據(jù)現(xiàn)場調查,滑坡區(qū)域在2006年于原地形陡緩交界處開始出現(xiàn)拉裂變形,并出現(xiàn)小范圍的垮塌；2012年6月28日,滑坡發(fā)生滑動垮塌,堵塞下部公路,并在滑動后緣形成新的臨空面,坡體前緣裂縫進一步變形拉裂；2012年8月16日,再次沿著前緣臨空面大規(guī)模發(fā)生滑動,堵塞下部公路和河道,并形成現(xiàn)狀地形中的圈椅狀滑床和陡壁,對上部滑體進一步形成良好的臨空條件,坡體中拉裂縫再次變形拉裂,形成多級錯坎地形。該滑坡的失穩(wěn)滑動是由前緣開始垮塌滑動,并形成新的臨空面導致后部巖土體繼續(xù)變形破壞的牽引式滑動模式。在2013年3月應急勘查的基礎上,結合勘查期間的深部位移監(jiān)測及地表位移監(jiān)測數(shù)據(jù),制定了對該高位滑坡采用鋼管樁的應急處理方案+后期抗滑樁的綜合治理兩步走的總體治理措施,經應急處理試運行期間的監(jiān)測數(shù)據(jù),該高位滑坡變形得到遏制,處于基本穩(wěn)定狀態(tài)。本論文對該高位滑坡的發(fā)育特征、形成條件及成因機制等進行分析,并對滑坡的穩(wěn)定進行定性及定量的分析。在此基礎上,對該高位滑坡滑動形成滾石、坡面泥石流、堵塞黑水河形成堰塞湖等次生災害鏈進行進一步的分析論證。
[Abstract]:Affected by geological structure, river cutting and other factors, the topography of Liangshan prefecture in Sichuan Province is quite undulating and steep, most of which are "V" type high mountain gorge landforms. Under the influence of topography, the microclimate in the area is obvious, and the concentrated and intense rainfall in short duration leads to landslides and debris flow disasters in Liangshan prefecture. From June 27 to June 28, 2012, the heavy rain in Ningnan County, A large number of landslides and debris flow disasters occurred in the county, resulting in certain casualties, road burial and so on. It also caused the slope to slip on the inner side of the S212 provincial road from Puge to Ningnan County. About 200, 000 square landslide materials were cut out and rushed along the slope to the foot of the slope under the action of gravity. On August 16, 2012, another large-scale slide occurred, reaching more than 700,000 square skids and flowing to the riverbed at the foot of the slope. The collapse caused two deaths and three missing persons. The road was blocked for more than 600 meters. Blocking the Heishui River more than 100 meters, the river level suddenly rose nearly 4 meters to form a barrier lake, blocking traffic for 15 days. The landslide is a direct threat to the life and property of 179 people living on the landslide, especially more than 70 people from 14 families in the landslide area. It indirectly threatens the lives and property of many factories, mines, power stations and other assets along the lower reaches of the Heishui River, including nearly 800 million yuan and nearly 20,000 people. Therefore, it is necessary and urgent to carry out engineering treatment of the high-level traction landslide. The high position traction landslide of Baishui River in Ningnan County, Sichuan Province is located on the right bank of Heishui River. The landslide is located in the high and steep gorge geomorphology area. On the other hand, the stress concentration is easy to form at the steep and gentle junction, and the shear stress concentration at the foot of the slope exceeds its shear strength. The shear failure occurs first at the foot of the slope, and the damage will develop towards the body of the slope. The landslide area is affected by Zemuhe fault, the occurrence of rock mass in landslide area is changed greatly, the small structure is relatively developed, and the rock mass is relatively broken. According to the field investigation, the landslide area began to appear tensile crack deformation and a small scale collapse in 2006 at the steep and gentle junction of the original terrain. On June 28, 2012, the landslide occurred sliding collapse, blocking the lower highway, and forming a new empty surface at the back of the slide. The front crack of the slope body was further deformed and cracked. On August 16, 2012, there was another large-scale slide along the front edge, blocking the lower highway and river course, and forming the ring chair slide bed and steep wall in the present terrain, thus further forming good conditions for the upper slider. The tensile cracks in the slope are deformed and cracked again, resulting in multilevel staggered ridge topography. The unstable sliding of the landslide begins from the front edge and forms a new traction sliding mode which leads to the continuous deformation and failure of the backside rock and soil. Based on the emergency survey in March 2013, combined with the monitoring data of deep displacement and surface displacement during the exploration period, The overall control measures of two steps for comprehensive treatment of the anti-slide pile in the later stage of the emergency treatment scheme of the high landslide with steel pipe pile are formulated. The deformation of the high landslide is restrained by the monitoring data during the trial operation period of the emergency treatment. In a basically stable state. In this paper, the development characteristics, forming conditions and formation mechanism of the high level landslide are analyzed, and the stability of the landslide is analyzed qualitatively and quantitatively. On the basis of this, the secondary disaster chain such as rolling stone, mud-rock flow on slope and blocking of Heishui River to form barrier lake are further analyzed and demonstrated.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22
本文編號：2376801
[Abstract]:Affected by geological structure, river cutting and other factors, the topography of Liangshan prefecture in Sichuan Province is quite undulating and steep, most of which are "V" type high mountain gorge landforms. Under the influence of topography, the microclimate in the area is obvious, and the concentrated and intense rainfall in short duration leads to landslides and debris flow disasters in Liangshan prefecture. From June 27 to June 28, 2012, the heavy rain in Ningnan County, A large number of landslides and debris flow disasters occurred in the county, resulting in certain casualties, road burial and so on. It also caused the slope to slip on the inner side of the S212 provincial road from Puge to Ningnan County. About 200, 000 square landslide materials were cut out and rushed along the slope to the foot of the slope under the action of gravity. On August 16, 2012, another large-scale slide occurred, reaching more than 700,000 square skids and flowing to the riverbed at the foot of the slope. The collapse caused two deaths and three missing persons. The road was blocked for more than 600 meters. Blocking the Heishui River more than 100 meters, the river level suddenly rose nearly 4 meters to form a barrier lake, blocking traffic for 15 days. The landslide is a direct threat to the life and property of 179 people living on the landslide, especially more than 70 people from 14 families in the landslide area. It indirectly threatens the lives and property of many factories, mines, power stations and other assets along the lower reaches of the Heishui River, including nearly 800 million yuan and nearly 20,000 people. Therefore, it is necessary and urgent to carry out engineering treatment of the high-level traction landslide. The high position traction landslide of Baishui River in Ningnan County, Sichuan Province is located on the right bank of Heishui River. The landslide is located in the high and steep gorge geomorphology area. On the other hand, the stress concentration is easy to form at the steep and gentle junction, and the shear stress concentration at the foot of the slope exceeds its shear strength. The shear failure occurs first at the foot of the slope, and the damage will develop towards the body of the slope. The landslide area is affected by Zemuhe fault, the occurrence of rock mass in landslide area is changed greatly, the small structure is relatively developed, and the rock mass is relatively broken. According to the field investigation, the landslide area began to appear tensile crack deformation and a small scale collapse in 2006 at the steep and gentle junction of the original terrain. On June 28, 2012, the landslide occurred sliding collapse, blocking the lower highway, and forming a new empty surface at the back of the slide. The front crack of the slope body was further deformed and cracked. On August 16, 2012, there was another large-scale slide along the front edge, blocking the lower highway and river course, and forming the ring chair slide bed and steep wall in the present terrain, thus further forming good conditions for the upper slider. The tensile cracks in the slope are deformed and cracked again, resulting in multilevel staggered ridge topography. The unstable sliding of the landslide begins from the front edge and forms a new traction sliding mode which leads to the continuous deformation and failure of the backside rock and soil. Based on the emergency survey in March 2013, combined with the monitoring data of deep displacement and surface displacement during the exploration period, The overall control measures of two steps for comprehensive treatment of the anti-slide pile in the later stage of the emergency treatment scheme of the high landslide with steel pipe pile are formulated. The deformation of the high landslide is restrained by the monitoring data during the trial operation period of the emergency treatment. In a basically stable state. In this paper, the development characteristics, forming conditions and formation mechanism of the high level landslide are analyzed, and the stability of the landslide is analyzed qualitatively and quantitatively. On the basis of this, the secondary disaster chain such as rolling stone, mud-rock flow on slope and blocking of Heishui River to form barrier lake are further analyzed and demonstrated.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22
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