巴基斯坦卡洛特水电站软岩地下洞室围岩分类及应用

Classification and application of surrounding rock for soft rock underground cave of Karot Hydropower Station in Pakistan

卡洛特水电站位于巴基斯坦吉拉姆河上,工程区分布地层为新近系弱胶结碎屑沉积岩,为较软岩-软岩。工程地下洞室围岩地质条件差,围岩稳定问题突出。在项目前期勘察中,对影响围岩稳定的主要地质问题进行了大量的勘察研究工作,并根据工程实际情况采用规范推荐的方法对围岩进行详细分类。工程施工期,应项目业主工程师要求采用Q系统进行分类,并开展了水电规范分类与Q系统分类的对比研究。简要介绍了项目地下洞室围岩的勘察研究,对围岩分类方法的应用进行了总结和阐述,以期对类似国外工程的勘察研究提供有益的借鉴。

Karot Hydropower Station is located on the Jhelum River in Pakistan.The distribution strata of the dam area is Neogene System of weak glued debris sedimentary rock,and it is under the category of relatively soft rock to soft rock.Poor geological conditions of the underground cave surrounding rock and its stability are the prominent problems.In the preliminary project survey,we carried out a large numbers of surveys and researches on the main geological problems affecting the stability of the surrounding rock,and the surrounding rock was classified in detail according to the method recommended by the specification in the light of the actual situation of the project.During the implementation period of the project,we used Q system at the request of the project owner and made the rock classification comparison between industry specifications and the Q system.We briefly introduced the survey conducted on the surrounding rock,summarized and expounded the application of the classification method in surrounding rock,so as to provide useful reference for the exploration and research of similar foreign projects.