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重庆市轨道交通1号线小什字车站及区间隧道工程断面变化频繁,部分隧道埋深浅,且存在1条与拟建地铁区间隧道走向基本一致的既有人防隧道。针对现场实际情况,分别采用短进尺、弱爆破、分层剥离车站全断面开挖方法、环形减振孔爆破开挖方法、静态破碎开挖方法,最终确保了隧道洞身开挖施工的安全和周围地上建筑物的安全,并取得较好效果。
The section of Xiaoshidizhan station and section tunnel of Chongqing Rail Transit Line 1 has frequent changes, some of the tunnels are shallow in depth, and there is an existing civil air defense tunnel which is basically the same as the tunnel in the proposed subway section. In view of the actual situation in the field, the methods of short-cut ruler, weak blasting, full-face excavation by stratified delamination station, blasting excavation by annular vibration-damping hole and static crushing and excavation method are respectively adopted to ensure the safety of tunneling and excavation construction Buildings on the ground around the safety and achieved good results.