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为了取得在松軟岩层中掘进坑道的快速施工經驗,我队曾于三月十八、十九、二十日三天在一分队团山普查組进行了試驗,现将所得結果整理于后。一、地質条件:岩层为风化花崗岩,相当于地質部山地工作岩石分級标准的三級,其中因长石风化后成为高嶺土类物質,矿脉风化程度与围岩相等。二、坑道规格:为0.9×1.8米水平坑道。三、作业条件:因坑道工人不足,故仅能采取二班作业,每班配备五人(爆破工在外),采取双掌子作业,两个掌子相距約200米。凿岩工具为自制螺旋杆
In order to gain experience in rapid construction of tunnels in soft rock formations, our team conducted a trial in the Teamsuan Group of the First Team on March 18, 19 and 20 March. The results are now compiled. First, the geological conditions: the rock is weathered granite, equivalent to the Ministry of Geology mountain work rock grading standards of the three, which because of feldspar weathering become kaolin-like material, vein weathering degree and wall rock equal. Second, tunnel specifications: 0.9 × 1.8 m horizontal tunnel. Third, the operating conditions: due to lack of tunnel workers, it can only take two shifts, each with five (blasting workers outside), to take double-headed child operations, the two palm about 200 meters apart. Drilling tools for self-made spiral rod