煤系地层采空区对隧道施工安全性的影响.pdfVIP

隧道/地下工程 宋南涛 陈炜韬 王明年 郦亚军 ( 61003 1) 以广东梅河高速公路葵岗隧道采空区段为实 , 通过有限差分法数值计算, 研究了采空区不同大小尺 寸和离隧道顶部的不同距离时对隧道施工安全性影响, 建立了采空区与隧道安全性之间的关系研究结果表 明: 采空区与隧道顶部距离 30 m, 是考虑采空区对隧道施工安全性影响的临界距离; 在采空区和隧道拱部净间距 为 2. 5 m 的情况下, 采空区小于 1. 5 m 1. 5 m 时, 采空区对隧道施工安全性影响不大, 但当采空区大于 2 m 2 m时, 采空区对隧道施工安全性影响很大, 此时隧道拱部失去稳定; 采空区的存在增加了隧道边墙位移增长 幅度 煤系地层采空区 有限差分 隧道安全 U 455. 49 A 1009- 4539 ( 2007) 03- 0048- 04 Safety A nalysis of Tunnelling in CoalM inded A rea S o ng N an ta o, C he n W e ta o, W a ng M ng n a n, L Ya jun ( Sou thw est Commun cat on U n vers ty, Chengdu 6 10031, Ch na) A b stract A ccord ng to the coa lm nedout area of Ku gang tunne l o fM e hefreew ay, nfluence on tunne ll ng safe ty cau sed by m nedout area of d fferent s ze and d fferent d stance from the top o f the tunne l s analyzed w th f n ted fference pro gram, and the relat on be wt een m nedout area and tunnel sa fety s establ shed. The result show s: the c r t ca l d stance that m nedou t area w ll a ffect tunnellng safe ty s 30 me ters; n the nstance that m nedout area s 2. 5 m eters aw ay from the top o f the tunne l, m nedout area w ll g ve a l ttle nfluence on tunne llng sa fe ty w hen the s ze of m nedout a rea s less than 1. 5 m 1. 5 m, how ever, t w ll nfluence tunnellng safety a lot w hen the s ze s m ore than 2 m 2 m and t w llm ake the top of the tunne l lose stab l ty; d splacem ent o f the s de w a ll o f the tunne lw ll nc rease a lot becau se o fm nedout area. K ey w ords coa lm nedout area; f n ted fference; tunne ll ng sa fety , 1 ( 2) , , , ,