

2020年1月3日,深圳地铁14号线福新停车场出入场线区间右线隧道顺利贯通,成为14号线全线首个贯通的区间,为后续各项施工节点的顺利完成奠定了坚实的基础。
深圳地铁14号线福新停车场出入场线区间右线全长482m,采用1台Φ6480土压平衡盾构机施工,穿越地层由上到下依次为素填土、砾质粘性土、粗砂、砾砂、全风化花岗岩,其中全断面砂层占区间一半以上,线路埋深3.5~10.7m,最小区间曲线半径仅250m,小半径、浅覆土、长距离富水砂层、近距离穿越构筑物是本工程施工控制的重难点。
盾构推进中,通过掘进姿态和参数控制、改良渣土、优化同步注浆浆液、计划性二次注浆等措施保障掘进稳定性,为后续盾构掘进提供了可靠的施工经验。截至目前,深圳地铁14号线工程进展平稳有序,全线主体工程共已开工30个,其中地连墙已完成98.31%、咬合桩已完成96.08%、土方已完成70.51%,主体结构施工和盾构施工已形成齐头并进的良好局面。
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