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工程科学与技术:2020,52(5):71-78
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白格滑坡裂缝区演变过程及其发展趋势分析
(1.成都大学 建筑与土木工程学院,四川 成都 610106;2.四川大学 建筑与环境学院,四川 成都 610065;3.四川大学 水力学与山区河流开发保护国家重点实验室 水利水电学院,四川 成都 610065;4.中国地质调查局成都地质调查中心,四川 成都 610081)
Evolution of the Cracking Zones at the Site of the Baige Landslides and Their Future Development
(1.School of Architecture and Civil Eng., Chengdu Univ., Chengdu 610106, Chian;2.College of Architecture and Environment, Sichuan Univ., Chengdu 610065, China;3.State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;4.Chengdu Center of China Geological Survey, Chengdu 610081, China)
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投稿时间:2020-04-02    修订日期:2020-06-24
中文摘要: 白格“10·10”滑坡后,其源区边界外残留有方量较大的裂缝区,“11·3”滑坡就是裂缝区部分失稳的结果。“11·3”滑坡后裂缝区范围进一步扩大,存在进一步失稳并进而滑坡堵江的可能性。为此,作者于2019年对滑坡区补充了地质调查,并开展了裂缝区深部变形与渗压监测等工作。结果表明:1)滑坡区岩性属于金沙江缝合带的构造混杂岩,以片麻岩为主,夹碳质板岩、大理岩以及超基性和酸性侵入岩。虽然构造活动扰动强烈,边坡整体为逆向坡。蚀变和风化作用对滑坡的孕育演化作用显著。2)自“11·3”滑坡发生至2019年6月,滑坡裂缝区范围一直在扩展。C1区扩展约500 m,到达白格村;C2区越过山脊,至滑坡边界直线距离约130 m;C3区范围相对稳定。从宏观变形来看,“11·3”滑坡诱发的裂缝变形最大,此后发展趋缓。3)C1-1、C2和C3-1区均已形成剪切带,变形深度C1-1区最小(18 m),C2区最大(67 m),C3-1区居中(22.5 m)。平均变形速率C1-1区最大,推测大于20 mm/d;C3-1区其次,达到3.33 mm/d;C2区最小,为0.29 mm/d。4)裂缝区不存在稳定的地下水位,变形与降雨未呈现关联性。5)裂缝区目前变形均未收敛,均处于蠕变变形状态。后期需要关注C1-1和C2-1区,特别是变形特征与局部基岩解体破坏情况。
中文关键词: 白格滑坡  裂缝区  演变  监测  趋势分析
Abstract:The Baige “10·10” slide generated large volume of cracking zones outside the boundary of its source area, of which part slipped and caused the “11·3” slide. The extent of the cracking zones further developed after the “11·3” slide and there still exists great possibility of another landslide to occur and block the Jinsha River. Therefore, in 2019 landslide geology was further investigated and field instrumentation, such as borehole inclinometer and pore water pressure, was implemented in the cracking zones. The results indicate that: 1) the bedrock in the landslide area is mainly tectonic mélange of gneiss in the Jinsha Suture Belt, intermingled with carbonaceous slate, marble, and intruded ultrabasic and acid rocks. The bedrock alteration and weathering played important roles in the development of the slides. 2) The scope of the cracking zones has been developing from the occurrence of the “11·3” slide to June 2019. Zone C1 has extended about 500 m reaching the Baige Village, Zone C2 over the hill ridge for~130 m, while C3 remains basically unchanged. As for the magnitude of deformation, the “11·3” slide-triggered one is the largest, it then slows down. 3) In the cracking zones C1-1, C2 and C3-1, the shear bands at depth are well developed and their depth reached 18 m, 67 m and 22.5 m and their averaged deformation velocity is 20, 0.29 and 3.33 mm per day respectively. 4) No stable water table is observed in the cracking zones and the deformation is not well correlated with rainfall. 5) The deformation in the cracking zones is still developing without any sign of stop. Close attention should be paid to the zones C1-1 and C2-1 in the future, especially for the development of cracks and the disintegration of the rock lump at their toes.
文章编号:202000246     中图分类号:X43    文献标志码:
基金项目:国家重点研发计划项目(2018YFC1505004;2018YFC1505006)
作者简介:陈菲(1980-),女,讲师,博士.研究方向:边坡工程;地下工程.E-mail:chenfei@cdu.edu.cn
引用文本:
陈菲,王塞,高云建,赵思远,李宗亮,巴仁基,杨仲康,邓建辉.白格滑坡裂缝区演变过程及其发展趋势分析[J].工程科学与技术,2020,52(5):71-78.
CHEN Fei,WANG Sai,GAO Yunjian,ZHAO Siyuan,LI Zongliang,BA Renji,YANG Zhongkang,DENG Jianhui.Evolution of the Cracking Zones at the Site of the Baige Landslides and Their Future Development[J].Advanced Engineering Sciences,2020,52(5):71-78.