一、应用概况及适用条件 目前在煤矿井巷工程设计中,一般都采用半圆拱或三心拱巷道断面,很少采用缺圆拱断面。缺圆拱也叫圆弧拱或弓形拱,我们自1965年开始试用以来,先后在白皎矿井主平硐、岔口及东西大巷,二水平上车场及暗斜井以及芙蓉矿井、巡场矿井、绿水洞矿井等工程均采用了缺圆拱巷道断面,约计万米左右。支护形式有料石砌(石旋)、混凝土(石旋)、光 First, the application of profiles and applicable conditions At present, the design of coal mine shaft and laneway engineering, the semi-circular arch or three-hearted arch roadway sections are generally used, rarely used lack of circular arch section. The lack of round arch, also known as arc arch or arched arch, we have been in trial since 1965, one after another in the White Jiao mine main adit, fork and stuff Lane, the two levels of the car and dark inclined well and Furong mine, patrol mine Lvshuang mine and other projects have adopted a lack of round arch tunnel section, about meters. Support form a stone material (stone spin), concrete (stone spin), light