Due to high in situ stress in the powerhouse area, important deformation of local surrounding rock, rock burst, shotcrete spalling occur during excavation.
由于场区地应力比较高，在开挖期间出现了局部围岩的大变形及岩爆、喷混凝土层剥落等不良现象。
2
The current state of deep excavation engineering in Shanghai area is described and the main technology in the civil construction of Shanghai metro Xujiahui Station is analyzed in detail in this paper.
本文综述了上海地区深基坑施工的现状，并详细分析了上海地铁徐家汇车站土建工程施工中的主要技术问题。
3
The Land Use and Cover Change process of the large-scale open mining area include: the land excavation, the land occupied, the land piled up.