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采用控制爆破技术对周围环境要求极严的高大建筑物、构筑物实施定向倒塌拆除是当代爆破技术应用和发展的一个重要方面。一、工程概况1989年6月，辽宁省地矿局朝阳坑探大队在朝阳市承揽了一烟囱拆除工程。该烟囱位于朝阳市郊殡仪馆院内，高35m，底径4m，外墙厚0.5m，内衬厚0.24m，砖砌结构，外墙与内衬之间有一7cm厚泥质充填夹层。烟囱底部正东偏西33°与正东偏西50°各有一0.72m（宽）×0.63m（高）与0.74m（宽）×0.8m（高）的烟道。两烟道其前者在下侧，后者在上侧。烟
The use of controlled blasting technology to perform targeted collapse and demolishing of tall buildings and structures with extremely strict surrounding environments is an important aspect of the application and development of contemporary blasting technology. I. Project Overview In June 1989, the Chaoyang Pit Exploration Brigade of the Liaoning Provincial Bureau of Geology and Mineral Resources contracted a chimney demolition project in Chaoyang City. The chimney is located in the funeral home of Chaoyang Suburbs, with a height of 35m, a bottom diameter of 4m, an outer wall thickness of 0.5m, a lining thickness of 0.24m, a brickwork structure, and a 7cm thick argillaceous filling sandwich between the outer wall and the inner lining. There is a 0.72m (width) × 0.63m (height) and 0.74m (width) × 0.8m (height) flue in the chimney at the bottom of the chimney, 33° west of the east and 50° east of the west. The former is on the lower side and the latter on the upper side. smoke