On the physical exploration results, the range of the abandonedworkings have been determined.
据物理勘探的结果，确定了采空区的范围，分析了大桥荷载对采空区煤柱的影响。
2
The rapid increase of industrial wastes and their disposal have caused serious contamination of ecological environment. In the meantime, there are a lot of abandoned underground workings in mines.