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苏联北穆依斯克隧道工程的水文地质条件复杂,施工中涌水量大(700～1000米~3/时)以及破碎带中有水泡和松散岩体,有时喷出碎石,砂粒和粘土。在掘凿净径7.5米竖井时,使用止水浆液和新注浆工艺效果良好。该工艺的实质是:在井筒周围布置27～38个注浆孔,孔深30～35米,各段的注浆在3～3.5米厚的砼封层保护下进行。用水泥—水玻璃浆液注浆。其中水玻璃含量为15～35升/米~3。若钻孔涌水量超过8米~3/时时,停止钻进并进行压力注浆,浆液水灰比从10:1或5:1逐渐变稠到3:1至0.5:1,注毕加压封孔。加压时
The hydro-geological conditions of the North Muyisk Tunnel project in the Soviet Union are complex. Large inflows (700-1,000 m 3 / hour) during construction and blisters and loose rock masses in the crushing zone sometimes give rise to gravel, sand and clay. When drilling a 7.5m-diameter shaft, the use of a water-stop slurry and a new grouting process worked well. The essence of this process is that 27 ~ 38 grouting holes are arranged around the wellbore and the hole depth is 30-35 meters. The grouting of each section is carried out under the protection of a concrete sealing layer of 3 to 3.5 meters thick. Grouting with cement-water glass slurry. Water glass content of 15 ~ 35 liters / m ~ 3. If the drilling gushing water exceeds 8m ~ 3 / h, stop drilling and pressure grouting, the slurry water-cement ratio gradually thickens from 10: 1 or 5: 1 to 3: 1 to 0.5: 1, Sealed. When pressurized