高寒峡谷地区碎裂松动岩体工程特性研究

受青藏高原持续隆升的影响,在西藏地区的澜沧江河谷一带形成了复杂的地质环境,工程地质问题极为复杂,河谷岸坡山脊部位多分布有一个个“碎裂松动岩体”。本文综合运用三维激光扫描、无人机影像测量、工程地质测绘、平硐勘探、室内点荷载试验和原位剪切试验等手段,系统地研究了碎裂松动岩体的分布特征、变形特征、成因机理和物理力学参数。结合碎裂松动岩体的变形程度,将碎裂松动岩体划分为强、弱变形两区,提出了碎裂松动岩体的成因是卸荷、倾倒变形及冻融等综合作用所致的观点。并在前述研究的基础上给出了碎裂松动岩体的处理建议,为坝基岩体利用或是边坡稳定性分析及处理奠定了一定的基础。

Study on the Engineering Characteristics of Cataclastic Relaxed Rock Mass in High-cold Canyon

Affected by the continuous uplift of the Tibetan Plateau, the complex geological environment has been formed in the Valley of Lancang River in Tibet, whose engineering geological problems are extremely complicated. Among them, “cataclastic relaxed rock mass” is usually distributed in the ridge of the bank slope. By the means of three-dimensional laser scanning, UAV aerial photography, geological survey, adit exploration, indoor point load test and in-situ shear test, this paper systematically studied the distribution characteristics, the deformation characteristics, the genetic mechanism, the physical and mechanical parameters of cataclastic relaxed rock mass. According to the degree of deformation, the cataclastic relaxed rock mass is divided into two areas with strong and weak deformation, and it is put forward that the cause of the formation of the cataclastic relaxed rock mass is the comprehensive effect of unloading, dumping deformation and freezing thawing. On the basis of the above research, the treatment proposals for cataclastic relaxed rock mass are given, which has laid a foundation for the use of rock mass in the dam foundation and the analysis and treatment of slope stability.