碎裂岩体区近距离交叠隧道施工引起的地表沉降规律  

Ground Surface Settlement Law Caused by Construction of Overlapping Tunnels in Fragmental Rock with Small Space Apart

作　　者：李金秋[1,2] 王秀艳[2] 孙琳[2] 李强[3] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国地质科学院水文地质环境地质研究所,河北石家庄050061 [3]山东科技大学,山东青岛266590

出　　处：《铁道建筑》2016年第7期64-69,共6页Railway Engineering

摘　　要：依托青岛地铁2号线枣山路站—李村站区间隧道近距离下穿3号线万年泉路站—李村站区间隧道工程,对单向单洞、单向双洞、双向四洞隧道施工引起的地表沉降规律进行数值模拟分析,并与现场测试数据加以对比。结果表明:单向单洞隧道施工引起的地表沉降规律基本遵循Peck公式,反弯点距离隧道横断面中心线约25 m,隧道断面开挖对地表沉降的影响范围为70 m;单向双洞隧道施工地表沉降趋势与单向单洞隧道大体一致,最大变形量6.5 mm,增幅达18.2%,发生在左右线中间岩土体正上方;双向四洞近距离交叠隧道地表沉降形态复杂,四洞开挖交互影响显著,最大变形量、反弯点距交叠区中心点距离、地表沉降影响范围大幅增加,分别为12.69 mm,26 m,80 m,地表最大变形区由单向双洞左右线中心线逐步向双向四洞交叠区中心点过渡。提出了预测地表沉降变形的修正Peck公式,并在工程现场进行了验证。A Qingdao Subway overlapping Tunnels engineering with small space apart,Z aoshanlu Station-Li V illage Station Tunnel on N o. 2 line crossing underneath Wannianquanlu Station-Li V illage Station Tunnel on N o. 3 line,was studied. The surface settlement caused by construction of one-way single hole,one-way two holes and two-way four holes tunnels was numerically simulated,and compared with the measured data as for one-way single hole tunnel,the surface settlement may be predicted using the Peck formula,the inflection point fromthe tunnel center line being 25 mand the influence range being 70 m. As for one-way two holes tunnel,its surface settlement is similar to that of one-way single hole tunnel,with a 6. 5 mmmaximumdeformation that is an increase of 18. 2%. As for two-way four holes tunnel,the surface settlement due to the construction of overlapping tunnels with small space apart is complicated. The maximumdeformation,the inflection point fromthe overlapping center line,and the influence range are 12. 69 mm,26 mand 80 m,respectively. The maximumsurface subsidence area is transferred gradually fromthe center line of the one-way two holes tunnel to the overlapping center of the two-way four holes tunnel. In this paper,a corrected Peck formula was proposed to predict the surface settlement and it was verified by the field test.

关 键 词：碎裂岩体 交叠隧道 地表沉降 单向单洞 单向双洞 双向四洞 

分 类 号：U455[建筑科学—桥梁与隧道工程]