has a foundation depth of?4.2? m in which there exists a large area of sandy cobble gravel strata of different depth. It speeds the construction pace and reduces the cost by using the smashing,directional and controlled blasting technology.

• 演马电厂扩建工程主厂房基础埋深达4.；2m；厂区埋深内存在大面积且厚度不均的砂卵砾石层；施工中采用破碎定向移位控制爆破技术进行处理；有利于加快进度和降低成本