地下工程支护,地下工程支护,dixia gongcheng zhihu,支护,地下工程,dixia,gongcheng,zhihu,[拼音]:dixia gongcheng zhihu[外文]:safety support for underground works地下工程开挖过程中,为防止围岩坍塌和石块下落采取的支撑、防护等安全技术措施...