韧性剪切带和蚀变岩体对坡体卸荷特征影响分析

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英文篇名：Influences of Ductile Shear Zone and Altered Rock Mass on Characteristics of Slope Unloading 作者：王浪 ; 丁军浩 ; 邓辉 ; 王劲翔 ; 涂国祥 英文作者：WANG Lang;DING Jun-hao;DENG Hui;WANG Jin-xiang;TU Guo-xiang;State Key Laboratory of Geohazard Prevention & Geoenvironment Protection,Chengdu University of Technology;Chengdu Institute of Survey and Investigation; 关键词：岩质高边坡 ; 韧性剪切带 ; 蚀变岩体 ; 坡体卸荷 ; 离散单元法程度(UDEC) 英文关键词：high rock slope;;ductile shear zone;;altered rock mass;;slope unloading;;universal discrete element code(UDEC) 中文刊名：长江科学院院报 英文刊名：Journal of Yangtze River Scientific Research Institute 机构：成都理工大学地质灾害防治与地质环境保护国家重点实验室;成都市勘察测绘研究院; 出版日期：2017-09-28 14:12 出版单位：长江科学院院报 年：2019 期：06 基金：国家自然科学基金项目(41272332) 语种：中文; 页：97-102+109 页数：7 CN：42-1171/TV ISSN：1001-5485 分类号：TV223.1

摘要

岸坡异常卸荷是西南深切河谷地区进行大规模水电工程建设过程中常遇到的典型工程问题之一。根据野外详细地质调查,得出研究区坡体卸荷特征,再以是否考虑韧性剪切带和蚀变带为变量建立3个二维离散元模型,模拟河谷5次下切后坡体的变形情况,对比分析韧性剪切带和蚀变带对坡体卸荷特征的影响。研究结果表明:研究区卸荷异常主要与韧性剪切带和蚀变岩体的发育有关;韧性剪切带和蚀变带质软,其软弱基座效应和弱抗风化能力加剧了坡体变形程度,同时构成软硬相间的坡体结构,使得沿缓倾坡外结构面的差异剪切错动更为明显。相关成果可供从事高边坡坡体卸荷研究人员参考。
        The abnormal slope unloading is one of the typical engineering problems encountered in large-scale hydropower project construction process in southwest deep valley area. Though field geological investigation, the characteristics of slope unloading was discovered, and three two-dimensional discrete element models were established to simulate the deformation of the slope after five times of valley incision to analyze the influence caused by ductile shear zone and the alteration zone on slope unloading characteristics under condition of considering ductile shear zone and the alteration zone or not. The results show that the anomalies of slope unloading is mainly related to the distribution of ductile shear zone and the alteration rock mass. The soft base effects and weak ability to resist weathering of the ductile shear zone and the alteration zone, which are weaker than normal rock mass in mechanical properties, exacerbate the slope deformation degree. At the same time, the hard and soft slope structure make the phenomenon different shear dislocation along the flat slope surface structure more apparent.

引文

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