摘要
依托北京地区第一座公路双连拱隧道—黑古沿隧道,开展中墙的受力特性研究。通过埋设量测元件对隧道中墙进行现场监控测试,获得了施工过程中,中墙的钢筋应力、底部锚杆内力及接触应力的变化情况,并结合数值模拟手段对施工诱发的中墙不均匀沉降进行研究,结果表明:最不利于中墙受力的施工工序发生在隧道由单侧施工过渡到双侧施工时;中墙底部截面的轴力及弯矩最大,有必要对中墙基底围岩采用小导管注浆方式进行加固;应该尽早施作初期支护以分担中墙承受的压力;中墙不仅存在横向不均匀沉降,而且存在纵向不均匀沉降,有必要设置临时横撑进行支护。研究成果为类似工程中控制施工诱发的裂缝发展,采取相应措施优化支护结构形式与参数提供了依据。
Based on the Heiguyan tunnelthe first road doublearch tunnel in Beijing, a series of research on mechanical behaviour of its middlewall have been done. The middlewall is monitored and analyzed by setting tes ting components in the tunnel and during each period of construction the steel stress of middlewall, bolt force and pressing stress are obtained. By means of numerical simulation, the uneven settlement of middlewall induced by tun nel construction is studied. The result indicates that the most dangerous construction procedure for middlewall load ing is from one side construction to both sides construction. The axial force and bending moment at the bottom section of middlewall is max and it is necessary to use tube grouting to strengthen the bottom of middlewall. The initial sup port should be applied as soon as possible to share the pressure on the middlewall. The lateral and the longitudinal uneven settlement of middlewall exist in the construction of tunnel. It is necessary to set temporary lateral brace to support the wall. These research results have high referential value for analogous project to control cracks development induced by construction and taking corresponding measures to optimize form and parameters of support structure
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第6期1355-1361,1367,共8页
Chinese Journal of Underground Space and Engineering
关键词
双连拱隧道
力学特性
监控量测
中墙
数值模拟
double-arch tunnel
mechanical behaviour
field monitoring
middle--wall
numerical simulation
