石场开采如何防坠落和坍塌编辑同志：我是一名现场安技人员，我单位为配合铁路工程施工，１９８２年建立了一个石场，主要生产铁路用道碴及其副产品。经过十几年的发展，已形成年产６万立方米道碴的能力，开采工作面也越来越大，高约７０米，岩口宽约２５０米。我们虽采用... How to Prevent Fallen Crashes and Collapse in Rock Quarry Edit Comrade: I am an on-site safety and technical personnel. In order to cooperate with railway construction, I set up a quarry in 1982 and mainly produces ballast and its by-products for railway. After more than a decade of development, it has become capable of producing 60,000 cubic meters of ballast annually. The working face is also getting larger and larger, with a height of about 70 meters and a width of about 250 meters. Although we use ...