[1]范可,冯佐海,王翔,等.桂林市岩质崩塌发育特征与影响因素[J].自然灾害学报,2019,28(02):169-182.[doi:10.13577/j.jnd.2019.0219]
 FAN Ke,FENG Zuohai,WANG Xiang,et al.Development of rockfalls in Guilin and its influencement factors[J].,2019,28(02):169-182.[doi:10.13577/j.jnd.2019.0219]
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桂林市岩质崩塌发育特征与影响因素
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《自然灾害学报》[ISSN:/CN:23-1324/X]

卷:
28
期数:
2019年02期
页码:
169-182
栏目:
出版日期:
2019-04-28

文章信息/Info

Title:
Development of rockfalls in Guilin and its influencement factors
作者:
范可1 冯佐海1 王翔2 姜明义2 刘之葵1 蔡永丰1
1. 广西有色金属隐伏矿床勘查及材料开发协同创新中心, 广西隐伏金属矿产勘查重点实验室, 桂林理工大学, 广西 桂林 541004;
2. 广西壮族自治区地质环境监测总站, 广西 桂林 541004
Author(s):
FAN Ke1 FENG Zuohai1 WANG Xiang2 JIANG Mingyi2 LIU Zhikui1 CAI Yongfeng1
1. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi & Guangxi Key Laboratory of HiddenMetallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, China;
2. The General Geo-environment Monitoring Station of Guangxi Zhuang Antonomous Region, Guilin 541004, China
关键词:
岩质崩塌发育特征影响因素失稳模式桂林市
Keywords:
rockfallcharacterizationinfluence factorsfailure modeGuilin
分类号:
P642.21;P694;X9
DOI:
10.13577/j.jnd.2019.0219
摘要:
对桂林市1980~2017 年间记录或现存的118 处岩质崩塌基本数据进行了统计分析和研究。结果显示:在时间上,桂林市岩质崩塌主要发生在每年3~7月份的雨季,这期间发生的岩质崩塌数占崩塌总数的 62.7%,崩塌数量与降雨量成正相关,且从2005年起岩质崩塌有明显的增加趋势;空间上,桂林市岩质崩塌主要发生在上泥盆统桂林组(D3g)、东村组(D3d)和融县组(D3r)厚层-块状灰岩侵蚀溶蚀作用形成的孤峰平原、峰丛洼地谷地和峰林平原地貌区,分布在这3个地貌区内的岩质崩塌分别占崩塌总数的 46%、38%和15%,且大多数岩质崩塌发生在坡高 50~200 m、坡角60°~90°的凸型或凹型的阳坡上;规模上,桂林市岩质崩塌以小型为主,规模一般在 0.5~350 m3。此外,桂林市岩质崩塌还具有明显的继发性特征,同一座山体(灾害点)发生的2次及2次以上崩塌数量占崩塌总数的 37%。除降雨外,地质构造、人类工程活动和生物风化作用等也是引发岩质崩塌的主要诱因。桂林市岩质崩塌的失稳模式主要有拉裂-坠落模式、压剪-滑移模式、拉裂-倾倒模式、塑流-拉裂模式、孤石崩落模式和空间滑移模式,其中以孤石崩落模式和压剪-滑移模式岩质崩塌最为易发。
Abstract:
Study of the documented rockfall incidents during 1980-2017 and survey of 118 existing rockfalls in Guilin reveal that 62.7% of the rockfall incidents occurred during the rainy season of March through July. Apparently the likelihood of rockfall is positively proportional to the amount of rainfall and the city sees remarkably increased trend of rockfall incidents from 2005. The rockfalls occurred in karst poljes with isolated limestone towers (accounting for 46% of the total rockfalls), low land and valley areas with clustered towers (accounting for 38%), and poljes with clustered towers (accounting for 15%). These three types of karst topography are resulted from dissolution of thickly bedded limestone of the Upper Devonian Guilin (D3g), Dongcun (D3d) and Rongxian (D3r) formations. Most of the rockfalls occurred on the south side of hills with slope height of 50-200 m and slope angle of 60-90°. Majority of the rockfalls in Guilin are rated at small scale (0.5-350 m3), The survey also shows that 37% of the rockfall incidents occurred as resurgent incidents. In addition to rainfall, geological structures, biochemical weathering, such as root wedging, and human geotechnical activities, are major triggering factors for rockfalls. Failure modes of rockfall in Guilin area include tensional fracture falling, compressional shear and sliding, tensional fracture toppling, plastic flow and extensional fracturing, single-rock falling, and wedge sliding. The single-rock falling and compressional shear and sliding are dominant failure modes in Guilin.

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备注/Memo

备注/Memo:
收稿日期:2018-01-22;改回日期:2018-06-25。
基金项目:国家自然科学基金项目(41162011)
作者简介:范可(1994-),男,硕士研究生,主要从事灾害地质学、地层学研究.E-mail:fankestone@163.com
通讯作者:冯佐海(1960-),男,教授,博士,主要从事构造地质学研究.E-mail:fzh@glut.edu.cn
更新日期/Last Update: 1900-01-01