Exfoliation Erosion and Deformation Failure of Excavated Loess Slope
-
摘要: 人工开挖是黄土地质灾害最积极的诱发因素之一。为揭示非大型工程未经支护的开挖型黄土边坡在卸荷、剥落、侵蚀作用下边坡的变形破坏特征及其对边坡稳定性的影响,通过野外调查、原位微型贯入测试、室内试验等方法,对陕西省延安地区23处开挖型黄土边坡进行研究。结果表明,边坡卸荷剥落层厚度与边坡开挖年龄呈线性正相关关系,现场贯入阻力值与边坡开挖年龄呈负幂相关关系,浅层土体化学侵蚀现象较深层土体强烈。开挖型黄土边坡的变形破坏模式主要为滑移式崩塌和蠕滑-拉裂式浅层滑坡,崩塌的破坏演化过程主要为“侵蚀剥落-内凹-张裂-滑移”,滑坡的破坏演化过程主要为“蠕滑-拉裂-贯通-滑脱”。Abstract: Excavation activity is one of the most active factors to cause the loess geo-hazards. In order to reveal the deformation and failure characteristics of the excavated loess slope under unloading, exfoliation and erosion, and its influence on the slope stability, 23 excavated loess slopes have been studied through carrying out field investigation, in-situ micro penetration test and indoor test in Yan'an area, Shaanxi Province. The results show that there is a linear positive correlation between the thickness of slope unloading exfoliation layer and the slope excavation age, and there is a negatively power correlation between the on-site penetration resistance value and the slope excavation age, and the shallow soil chemical erosion is stronger than deep soil. The deformation and failure modes of excavated loess slopes are mainly slip-type collapse and creep-slipping shallow landslide. The failure and evolution process of collapse is mainly "exfoliation erosion-concave-crack-slip", while the failure and evolution process of landslide is mainly "creep-pull-through-slip".
-
Keywords:
- loess slope /
- excavation /
- exfoliation and erosion /
- deformation and failure /
- Yan'an area
-
-
黄玉华,冯卫,李政国.陕北延安地区2013年"7.3"暴雨特征及地质灾害成灾模式浅析[J].灾害学,2014,29(2):54-59. HUANG Yuhua,FENG Wei,LI Zhengguo.Characteristics and geological disaster mode of the rainstorm happened on July 3. 2013 in Yanan area of Shaanxi Province[J].Journal of Catastrophology,2014,29(2):54-59.
薛强,张茂省.延安淹土安滑坡监测预警及变形特征[J].西北地质,2018,51(2):220-226. XUE Qiang,ZHANG Maosheng.Monitoring, early warning and deformation characteristics of Yantu'an landslide in Yan'an[J].Northwestern Geology,2018,51(2):220-226.
彭建兵,吴迪,段钊,等.典型人类工程活动诱发黄土滑坡灾害特征与致灾机理[J].西南交通大学学报,2016,51(5):971-980. PENG Jianbing,WU Di,DUAN Zhao,et al.Disaster characteristics and destructive mechanism of typical loess landslide cases triggered by human engineering activities[J].Journal of Southwest Jiaotong University,2016,51(5):971-980.
裴向军,袁广,张晓超,等.坡脚开挖诱发滑坡机理——以沙井驿滑坡为例[J].山地学报,2017,35(2):195-202. PEI Xiangjun,YUAN Guang,ZHANG Xiaochao,et al.Study on the mechanism of the loess landslide triggered by slope toe excavation-for the example of the landslide of Shajingyi[J].Mountain Research,2017,35(2):195-202.
朱继良,黄润秋,张诗媛,等.某水电站进水口高边坡开挖的变形响应研究[J].岩土力学,2010,31(2):593-598. ZHU Jiliang,HUANG Runqiu,ZHANG Shiyuan,et al.Study of deformation response of a high rock slope excavation at an intake for a large hydropower station[J].Rock and Soil Mechanics,2010,31(2):593-598.
吕远强,张兴勤,姜海波.晋西地区工程开挖形成的黄土边坡的最优坡率[J].煤田地质与勘探,2011,39(6):58-62. LU Yuanqiang,ZHANG Xingqin,JIANG Haibo,et al.Optimal slope rate of loess slope formed by construction excavation in west Shanxi[J].Coalgeology & Exploration,2011,39(6):58-62.
李明,张嘎,张建民,等.开挖条件下含水平砂土夹层边坡破坏模式研究[J].岩土力学,2011,32(Suppl.1):185-189. LI Ming,ZHANG Ga,ZHANG Jianmin,et al.Research on failure mode of clay slope containing horizontal sand interlayer under excavation conditions[J].Rock and Soil Mechanics,2011,32(Suppl.1):185-189.
王新刚,胡斌,赵治海,等.渗流作用下节理型黄土开挖边坡塌滑破坏分析[J].自然灾害学报,2014,23(2):47-52. WANG Xingang,HU Bin,ZHAO Zhihai,et al.Analysis of collapse sliding failure of the excavation slope of joint type loess under the action of seepage[J].Journal of Natural Disasters,2014,23(2):47-52.
张茂省,校培喜,魏兴丽.延安市宝塔区崩滑地质灾害发育特征与分布规律初探[J].水文地质工程地质,2006,(6):72-79. ZHANG Maosheng,XIAO Peixi,WEI Xingli.A preliminary discussion of the occurrence of landslide in the Baota district of Yan'an City[J].Hydrogeology and Engineering Geology,2006,(6):72-79.
张茂省,孙传尧,校培喜,等.延安市宝塔区地质灾害详细调查示范[J].西北地质,2007,40(2):29-55. ZHANG Maosheng,SUN Chuanyao,XIAO Peixi,et al.A demonstration project for detailed geo-hazard survey in the Baota District, Yan'an[J].Northwestern Geology,2007,40(2):29-55.
刘新根,奥村运明,张小旺.岩石边坡风化与侵蚀的研究[J].矿业研究与开发,2006,26(4):30-32. LIUXingen,AOCUN Yunming,ZHANG Xiaowang.Study on the weathering and erosion of rock slope[J].Mining R & D,2006,26(4):30-32.
段钊,赵法锁,陈新建.陕北黄土高原区崩塌发育类型及影响因素分析——以吴起县为例[J].自然灾害学报,2012,21(6):142-149. DUAN Zhao,ZHAO Fasuo,CHEN Xinjian.Types and influencing factors of collapse development in loess plateau region of north Shaanxi:a case study of Wuqi County[J].Journal of Natural Disasters,2012,21(6):142-149.
王根龙,张茂省,苏天明,等.黄土崩塌破坏模式及离散元数值模拟分析[J].工程地质学报,2011,19(4):541-549. WANG Genlong,ZHANG Maosheng,SU Tianmin,et al.Collapse failure modes and dem numerical simulation for loess slopes[J].Journal of Engineering Geology,2011,19(4):541-549.
薛强,唐亚明,孙萍萍,等.降雨入渗对黄土斜坡土体含水率时空分布特性的影响[J].水土保持通报,2014,34(2):53-56. XUE Qiang,TANG Yaming,SUN Pingping,et al.Temporal-spatial distribution of soil water content in loess slope subjected to rainfall infiltration[J].Bulletin of Soil and Water Conservation,2014,34(2):53-56.
ZHANG M,LIU J.Controlling factors of loess landslides in western China[J].Environmental Earth Sciences,2010,59(8):1671-1680.
-
期刊类型引用(11)
1. 李征征,高晓雯,王璋,李同录. 黄土筑坝填方工程地质问题及处理措施分析. 西北水电. 2024(01): 27-32+39 . 百度学术
2. 马杰,何开明,常文斌,邢爱国. 基于离散元的采空诱发山体滑塌失稳模式研究. 水文地质工程地质. 2024(03): 171-179 . 百度学术
3. 王振华,邓辉,张永军. 基于极限抗剪强度改进的压实填方边坡稳定性评价方法研究. 西北地质. 2024(04): 262-270 . 本站查看
4. 薛强,张茂省,董英,孟晓捷,郭小鹏,冯卫,洪勃,王涛,刘文辉,田中英,张戈,卢娜. 基于DEM和遥感的黄土地质灾害精细化风险识别——以陕北黄土高原区米脂县为例. 中国地质. 2023(03): 926-942 . 百度学术
5. 刘思璇,高建恩,李文证,高哲,周凡凡,王照润,王鹭. 黄土丘陵区边坡开挖对土壤抗蚀性影响. 水土保持研究. 2022(02): 23-30 . 百度学术
6. 卢永兴,陈剑,霍志涛,李毅,蓝景周,聂小力,岳连雄. 降雨与开挖作用下黄土滑坡失稳过程分析:以关中地区长武县杨厂村老庙滑坡为例. 地质科技通报. 2022(06): 95-104 . 百度学术
7. 薛强,唐亚明,白轩. 吕梁山区大宁县城地质灾害破坏模式及风险管控. 山地学报. 2021(01): 151-162 . 百度学术
8. 武跃跃,李小明. 辛置镇黄土边坡变形破坏及其影响因素分析. 华北科技学院学报. 2021(02): 79-85 . 百度学术
9. 代永江. 黄土地质区域降水规律分析与气象预警研究. 陕西水利. 2021(08): 32-34+38 . 百度学术
10. 焦楚杰,麻若楠,张国和,宋飞,冉志武,杨城. 二庄科北区滑坡的基本特征与形成机理. 徐州工程学院学报(自然科学版). 2020(03): 47-53 . 百度学术
11. 薛强,张茂省,高波. 斜坡单元支持下基于土体含水率的陕西省清涧县城区黄土滑坡危险性评价. 中国地质. 2020(06): 1904-1914 . 百度学术
其他类型引用(8)
计量
- 文章访问数: 1698
- HTML全文浏览量: 4
- PDF下载量: 1677
- 被引次数: 19