危岩锚固计算方法研究  

RESEARCH ON ANCHORAGE CALCULATION METHOD FOR UNSTABLE ROCK

作　　者：陈洪凯[1,2] 唐红梅[1] 胡明[1] 李强[1] 

机构地区：[1]重庆交通学院岩土工程研究所 [2]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044

出　　处：《岩石力学与工程学报》2005年第8期1321-1327,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：交通部重点科技基金项目(95060233);交通部跨世纪人才专项基金(95050508);高等学校重点实验室访问学者基金;西部交通项目(200332822047)

摘　　要：危岩是三峡库区典型的地质灾害类型之一,根据失稳类型将危岩分为坠落式危岩、滑塌式危岩和倾倒式危岩3类,其破坏机理分别属于剪切破坏、压剪破坏和拉剪破坏。支撑、锚固、充填等是治理危岩的常用技术类型,其中锚固技术使用频率最高。作用在危岩体上的荷载主要有自重、裂隙水压力和地震力,其中裂隙水压力包括天然状态和暴雨条件下的裂隙水压力,可构成3种荷载组合。按照坠落式危岩和倾倒式危岩稳定系数不小于1.5、滑塌式危岩稳定系数不小于1.3的治理目标,基于极限平衡理论并遵循每类危岩的破坏机理,建立了每类危岩的锚固计算方法,包括非预应力和预应力锚固2类技术,获得了确定每种锚固技术所需要的最小锚杆数计算式。所提出的计算方法已经在三峡库区数百个危岩体治理中得到成功应用,为重庆市有关地方标准的修订完善奠定了基础。As one of the typical disasters in the Three Gorges reservoir region, unstable rock can be classified as three types in views of unstable mode, i.e., fall unstable rock, slide unstable rock and topple unstable rock with failure mechanism of shear, compression-shear and tension-shear respectively. Support, anchorage and filling etc. are used extensively in controlling of unstable rock in which anchorage is in most commonly used. Loads on unstable rock mass usually include weight, fissure water pressure, and earthquake force, of which fissure water pressure exists in natural condition and rainstorm condition respectively, and three load combinations are made. Taking stability safety factor that greater than 1.5 to fall unstable and topple unstable rock and 1.3 to slide unstable rock as control object, the authors establish anchorage calculation method for every type of unstable rock reinforced with anchorage and pre-stressed anchorage based on equilibrium theory and failure mechanism of every type of unstable rock, and the minimum anchors needed can be obtained. The proposed methods have been successfully applied in control of hundreds of unstable rocks in the Three Gorges reservoir region, which will be valuable in revision of the local standard of Chongqing city.

关 键 词：岩石力学 危岩 锚固技术 计算方法 三峡库区 

分 类 号：TU457[建筑科学—岩土工程] P642.21[建筑科学—土工工程]