【導(dǎo)讀】六、勞動(dòng)力計(jì)劃····························································-22-. 隧道洞身穿越主要地層為Q2粉土、碎。采用管棚增加巖體的穩(wěn)定性,以便于施工,管棚設(shè)計(jì)長(zhǎng)30m,為保證。30cm,直徑108mm,壁厚5mm。鉆至設(shè)計(jì)深度后,在無(wú)孔管內(nèi)注入M20水泥。砂漿,累計(jì)長(zhǎng)度為1890m,壓注水泥砂漿。