基于数值模拟研究倾倒式危岩的控制设计工况  

Research on Control Design Case to Toppling Unstable Rock in FEM

作　　者：唐红梅[1] 

机构地区：[1]重庆交通学院岩土工程研究所,重庆400074

出　　处：《地下空间与工程学报》2006年第4期658-661,699,共5页Chinese Journal of Underground Space and Engineering

基　　金：交通部重点科技基金项目(95060233);西部交通项目(200332822047);交通部人才基金项目(95050508);高等学校重点实验室访问学者基金资助项目;国家十五科技攻关项目(2001BA604A023)

摘　　要：危岩是迄今国内外研究最薄弱的地质灾害类型之一,尤其在危岩分类及识别、发育机理、稳定性分析及有效防治方面目前处于定性、半定量阶段。根据危岩失稳模式可将危岩分为滑塌式危岩、倾倒式危岩和坠落式危岩三类[1],目前在进行危岩稳定性分析中,拟定了三种荷载工况,分别是工况一(自重+天然状态裂隙水压力)、工况二(自重+暴雨状态裂隙水压力)和工况三(自重+天然状态裂隙水压力+地震)。作者通过对倾倒式危岩进行有限元数值模拟,基于位移场和应力场分析得到工况二为最不利工况的重要结论,换言之,工况二即为倾倒式危岩治理工程的控制设计工况。Hitherto, as one of the typical geologic disasters, the study on unstable rock is the weakest one, especially concerning the study on identification and classification of unstable rock, stability analyses and effective control which are in the description or semi-quantltative stage. According to the unstable model, the unstable rock can be classified into three classes, i.e. sliding unstable rock, toppling unstable rock and falling unstable rock. Up to now, three cases are usually provided in stablility analyses, i.e. case 1 （composed of weight of unstable rock and fissure water pressure under natural condition）, case 2（composed of weight of unstable rock and fissure water pressure under rainstorm condition） and case 3 （composed of weight of unstable rocks fissure water pressure under natural condition and earthquake force） . Taking the toppiing unstable rock as an example, the author makes much simulation to the unstable rock based on FEM in this paper, which result in one valuable conclusion that case 2 is the most unfavorable case in design through displacement field and stress field analyses. In other words, case 2 is the control design case in control engineering of toppling unstable rock.

关 键 词：倾倒式危岩 有限元数值模拟 位移场 应力场 控制设计工况 

分 类 号：P642.3[天文地球—工程地质学] O346.5[天文地球—地质矿产勘探]