某山区机场高填方滑坡变形特征分析
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摘要
西南山区某机场高填方边坡在雨季结束后不久产生了变形。通过现场调查,坡体后部土面区出现了三条拉张裂缝,左右侧界也有明显变形迹象,坡脚五级马道水沟挤压变形严重,坡脚挡墙产生一小段垮塌变形。通过地表宏观变形判断坡体处于挤压变形阶段。对此段填方体滑坡及时实施了应急变形监测与工程地质勘察。通过地表变形监测曲线分析,由于错过了初始变形阶段的监测,该滑坡变形一开始就处于等速变形阶段。该滑坡在抗滑桩开挖过程中,变形明显加剧。坡体变形进入加速阶段后,变形速率及变形加速度较等速变形阶段成倍增加。在变形进入临界状态前,及时实施了坡体后部刷方减载,坡脚堆载反压的应急治理措施。应急治理措施实施后,坡体变形速率迅速减小,为永久治理工程的实施争取了时间。
The high fill slope of an airport in a mountainous area of southwest China deformed shortly after the end of the rainy season. Through the field investigation,three tensile cracks was observed in the soil surface area at the back of the slope. The left and right boundaries also showed obvious deformation,and the grade 5 raceway at the foot of the slope is seriously extruded. The creep deformation stage of slope is judged by the surface macroscopic deformation. The emergency deformation monitoring and engineering geological survey were carried out in time. Through the analysis on surface deformation monitoring curve,it was found that the deformation of landslide was at the stage of constant velocity at the very beginning,since the stage of initial deformation was missed. The deformation of the landslide was obviously intensified in the process of anti-slide pile excavation, after entering the acceleration stage, the deformation rate and acceleration increased exponentially compared with that of the constant deformation stage. Before the deformation entered the critical state,the emergency measures of load reduction by brush side at the back of slope body and backpressure by heap load at slope foot were implemented in time. Thus,the rate of slope deformation decreased rapidly,which bought time for the implementation of permanent treatment project.
The high fill slope of an airport in a mountainous area of southwest China deformed shortly after the end of the rainy season. Through the field investigation,three tensile cracks was observed in the soil surface area at the back of the slope. The left and right boundaries also showed obvious deformation,and the grade 5 raceway at the foot of the slope is seriously extruded. The creep deformation stage of slope is judged by the surface macroscopic deformation. The emergency deformation monitoring and engineering geological survey were carried out in time. Through the analysis on surface deformation monitoring curve,it was found that the deformation of landslide was at the stage of constant velocity at the very beginning,since the stage of initial deformation was missed. The deformation of the landslide was obviously intensified in the process of anti-slide pile excavation, after entering the acceleration stage, the deformation rate and acceleration increased exponentially compared with that of the constant deformation stage. Before the deformation entered the critical state,the emergency measures of load reduction by brush side at the back of slope body and backpressure by heap load at slope foot were implemented in time. Thus,the rate of slope deformation decreased rapidly,which bought time for the implementation of permanent treatment project.
引文
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[2]丁秀美.西南地区复杂环境下典型堆积(填)体斜坡变形及稳定性研究[D].成都:成都理工大学,2004.DING Xiumei. A study on the deformation and stability of typical debris and embankment slope with complicated environment in Southwestern China[D].Chengdu:Chengdu University of Technology,2004.
[3]刘桂琴,王子玉,高振鲲.贵州某高填方滑塌变形监测分析[J].人民长江,2007,38(11):146-147.LIU Guiqin,WANG Ziyu,GAO Zhenkun. Deformation monitoring analysis for slumping of certain high fill in Guizhou[J]. Yangtze River,2007,38(11):146-147.
[4]缪丹.降雨及地震对九黄机场高填方边坡稳定性影响[D].成都:成都理工大学,2008.LIAO Dan. Study on the influence of rainfall and earthquake to the stability of high embankment slope of JH airport[D]. Chengdu:Chengdu University of Technology,2008.
[5]马闫,王家鼎.黄土贴坡高填方变形破坏机制研究[J].岩土工程学报,2016,38(3):518-528.MA Yan,WANG Jiading. Deformation and failure mechanism of high sticking loess slope[J]. Chinese Journal of Geotechnical Engineering,2016,38(3):518-528.
[6]朱才辉,李宁.基于黄土变形时效试验的高填方工后沉降研究[J].岩土力学,2015,35(10):3023-3031.ZHU Caihui,LI Ning. Post-construction settlement analysis of loess-high filling based on time-dependent deformation experiments[J]. Rock and Soil Mechanics,2015,35(10):3023-3031.
[7]张硕,裴向军.降雨诱发黄土高填方支挡边坡失稳机理研究[J].工程地质学报,2017,25(4):1094-1104.ZHANG Shuo, PEI Xiangjun. Rainfall induced instability mechanism of high embankment retaining loess slope[J]. Journal of Engineering Geology,2017,25(4):1094-1104.
[8]谢春庆,潘凯,廖崇高,等.西南某机场高填方边坡滑塌机制分析与处理措施研究[J].工程地质学报,2017,25(4):1083-1093.XIE Chunqing,PAN Kai,LIAO Chonggao,et al.Landslide mechanism and treatment measures for high fill slope at airport in southwestern China[J]. Journal of Engineering Geology,2017,25(4):1083-1093.
[9]姚仰平.山区高填方机场的智能建造与安全运营[J].科技导报,2018,36(17):106-110.YAO Yangping. Intelligent construction and safe management of high filling airports inmountains[J].Science&Technology Review,2018,36(17):106-110.
[10]王恭先,徐峻岭,刘光代,等.滑坡学与滑坡防治技术[M].北京:中国铁道科学出版社,2004:330-331.WANG Gongxian,XU Junlin,LIU Guangdai,et al.The science and control technology of landslide[M].Beijing:China Railway Science Press,2004:330-331.
[11]许强,曾裕平.具有蠕变特点滑坡的加速度变化特征及临滑预警指标研究[J].岩石力学与工程学报,2009,28(6):1109-1116.XU Qiang,ZENG Yuping. Research on acceleration variation characteristics of creep landslide and earlywarning prediction indicator of critical sliding[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(6):1109-1116.
[12]许强,汤明高,等.滑坡时空演化规律及预警预报研究[J].岩石力学与工程学报,2008,27(6):1104-1112.XU Qiang,TANG Minggao,et al. Research on spacetime evolution laws and early warning-prediction of landslides[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(6):1104-1112.
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