·1857 ·
新建隧道长距离平行近接既有地铁施工风险
控制研究
谭 敏
(北京建工土木工程有限公司,100015,北京)
摘 要: 为了保证新建隧道长距离平行近接既有地铁的安全施工,采用层次分析法( AHP)研究了某工
程的主要风险,并比选了不同注浆方案综合效果,结合现场监测对拟定的加固措施进行的验证,结果表明:
(1)对于新建隧道近接侧穿运营地铁工程:近接风险(S 1)>自身风险(S 2)>工程地质(S 3)≈水文地
质(S 4),即施工中应首先考虑近接施工对于既有运营地铁线路的影响,其次是施工自身风险。( 2)3 种
方案的综合效果:注浆 2 m 方案>注浆 3 m 方案>注浆 4 m 方案,推荐该工程采用注浆 2 m 的加固方案。(3)
现场采用深孔注浆加固方案后,新建隧道安全施工通过该区域,既有运营隧道监测指标均小于安全阈值。优
选出的控制措施保障了长距离平行近接施工的安全稳定。
关键词: 隧道工程;长距离平行近接;既有地铁;施工风险
中图分类号:U 25 文献标志码:A 文章编号:1000-4726(2023)15-1857-03
RESEARCH ON RISK CONTROL OF NEW TUNNELS IN LONG-DISTANCE PARALLEL
PROXIMITY TO EXISTING SUBWAYS
TA N Min
(BCEG Civil Engineering Co., Ltd., 100015, Beijing, China)
Abstract: For the safe construction of new tunnels in long-distance parallel proximity to existing
subways, major engineering risks were studied by the analytic hierarchy process (AHP). Comprehensive
effects of different grouting schemes were compared. The proposed reinforcement measures were verified
in conjunction with on-site monitoring. Results show that: (1) For new tunnels in proximity to subways
in operation: proximity risks (S1) > construction risks (S2) > engineering geology (S3) ≈ hydrogeology
(S4), so the impact of proximity construction on existing subways in operation should be considered
first during construction, followed by construction risks; (2) Comprehensive effects of three schemes: 2m
grouting scheme > 3m grounding scheme > 4m grouting scheme, so the reinforcement scheme of 2m
grouting is recommended for the project; (3) When reinforcement by deep hole grouting is applied on
site and safe construction of new tunnels is performed, the monitoring indicators of tunnels in operation
are below the thresholds. The preferred control measures can ensure the safety and stability of long-
distance parallel proximity construction.
Keywords: tunnel engineering; long-distance parallel proximity; existing subway; construction risk
虽然城市轨道交通的快速发展给人们的出行带来
了极大便利,但地铁轨道交通趋于密集化也给新建轨
道交通线路的建设施工提出了更高的要求,越来越多
的隧道需近接下穿既有运营的结构物(或构筑物),
保证新建结构的施工安全和既有结构的安全稳定是亟
待解决的问题。
当前针对城市隧道近接施工的研究主要包括集中
穿越风险评价、施工方案优化、施工力学、影响分
区、加固措施等方面。以某新建隧道长距离平行近
接既有地铁施工为背景,采用层次分析法( Analytic
Hierarchy Process,简称AHP)研究了该长距离平行
近接施工中隧道的主要风险,构建层次分析模型,优
选不同注浆方案的加固措施。
1 工程概况
某新建地铁隧道采用矿山法施工,隧道为标准马
蹄形断面,最大净宽 5.2 m,
新建隧道长距离平行近接既有地铁施工风险控制研究(论文).pdf