【摘要】 危岩体是指陡峭边坡上被多组结构面切割,在重力、风化营力、地应力、地震、水体等作用下与母岩逐渐分离,稳定性较差的岩体。其对工程建设的潜在威胁严重。野外调查是危岩体研究中的最基础,最关键的部分。在总结对我国西南地区大型水电站危岩体的野外调查、险情排查经验的基础上,提出危岩体调查应该按资料收集、了解调查区所影响的建构筑物的特征、调查区全貌观察(确定调查的路线)、初步调查以及补充调查和现场复核等步骤进行。介绍了危岩体的边界、成因、稳定性、几何尺寸、失稳方式、运动轨迹及对建构筑物可能造成的危害等的确定方法。还介绍了先进的三维激光扫描技术在危岩体调查中的应用。最后提出了根据地质特征对危岩体进行稳定性分类的方法。这些成果有助于预防边坡地质灾害和边坡防护对策的制定。更多还原

【Abstract】 Potential unstable rock masses are low stability ones on the steep slope which are delimited by several discontinuities and gradually separated from parent rock masses under the effect of gravity,weathering stress,crustal stress,earthquake,water etc.They badly threaten the safety of engineering construction.Field survey is the most basic and key portion in their research.Based on summarizing the field survey and danger checking experience at large hydropower station in Southwest China,the process which should be divided into collecting information,learning the construction character in investigated area,observing investigated area panorama(determining the way for field survey),primary and supplementary surveying,field checking etc.is proposed.Then the determining measure in boundary,cause of formation,stability,geometrical dimension,failure pattern,possible movement track,possible endangering the construction etc.of potential unstable rock masses and the application of advanced 3D Laser Scan- ning System in their survey are introduced.Finally,the stability classification method based on geological characteris- tics for potential unstable rock masses is put forward.The results may help us to make out a draft of geohazards pre- vention and slope protection countermeasures.更多还原