1·As longwall caving technology prevails rapidly in China, gas emission from longwall faces and goaf area increases continuously.
随着放顶煤开采技术在我国的迅速普及，采煤工作面及采空区的瓦斯涌出量不断增加。
2·The paper introduced the successful application of high bench caving method of using deep hole roller rock bit into the practice of solving the complex goaf area, a stuff problem of this kind.
采用深孔牙轮钻机、利用高台阶崩落法成功地处理了复合采空区，解决了复合采空区处理难的问题，使技术人员在熟练浅采、深采空区处理的情况下，又探索出复合采空区的处理方法。
3·Based on the field investigation data, the evaluation has been done for the geological hazards in the planned highway area, such as karst, collapse, landslide, goaf, soft soil, etc.
根据野外调查资料，对拟建公路区域内的地质灾害：岩溶、崩塌、滑坡、采空区、软土进行了评估。
4·This study provides a reference for safe utilizing the goaf site, protecting water resources in mining area and preventing deterioration of the ecological environment.
此研究对于如何安全利用采空区场地，保护矿区水资源、防止生态环境恶化有一定的参考价值。