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老挝万象钾盐工程地处老挝万象平原,属海洋性沉积地质成矿,基建井巷开拓工程需穿越大量含盐泥岩段地层,给工程施工带来很大困难,特别是平巷交岔巷道的施工困难更大。本工程在遇此特殊地质条件且交岔点属反向掘砌施工时,采用边墙小导洞,先墙后拱,留中心三角岩堆,锚网喷加槽钢拱架做临时支护及分段全断面正向掘砌的施工法,保质、安全顺利完成了该项工程的多个类型交岔点工程施工任务。
Laos Vientiane potassium salt project is located in Vientiane Plain, Laos, is a marine sedimentary geological mineralization, construction of the basic roadway to be through a large number of salt mudstone strata, to the construction of great difficulty, especially the cross-lane roadway Construction more difficult. When this special geological condition is encountered and the cross-over point belongs to the reverse excavation construction, the project uses the small-size guide wall of the side wall, the back arch of the first wall, the triangular rock pile left in the center and the anchor net spraying and adding channel steel arch to make temporary support And the whole section of section digging forward the construction method, durability, safety and successful completion of the project more than one type of cross-point construction tasks.