隧道对临近建筑物的地震反应影响分析

Analysis on Seismic Response Effect of Tunnel to Nearby Structure

为了研究隧道对成层软土地基上不同基础形式建筑物地震反应的影响,构建了结构-基础-土-隧道体系动力相互作用的非线性完全有限元计算模型,在考虑土体重力的前提下,对筏片基础、桩筏基础相互作用体系进行了时域内数值分析。计算结果表明,当隧道紧靠建筑物时,筏基-结构相互作用体系的基础和结构顶层水平位移均发生了向无隧道一侧的偏移,而桩筏基础-结构相互作用体系的基础和结构顶层水平位移均未发生偏移。隧道在建筑物正下方时框架各对应柱的剪力峰值均最大,隧道紧靠建筑物时次之,隧道距建筑物10 m和无隧道时框架柱剪力几乎相等,并且最小。隧道距建筑物10 m时,其对两种基础形式的建筑物地震反应几乎无影响。

In order to study the effect of tunnel to nearby structure on layered soft-soil with different foundations, non-linear interaction finite element model was set up, which is composed the premise of considering gravity, this interaction model was analyzed of structure, foundation, soil and tunnel. with time domain numerical method. The results showed when the structure on raft foundation was close to the tunnel, the total displacement at the top of superstructure took place irreclaimable excursions to another direction, the foundation swung, too. But that of the structure on pile-raft foundation was not. When tunnel was under structure, the peak sheafing force of frame columns was the biggest; then, the structure closing to tunnel, the structure away from tunnel to ten meter; the structure without tunnel was the smallest. When tunnel was away from structure to ten meter, the influence structure was little. The superstructure on the pile-raft foundation turning into plasticity more was than that on the raft foundation, and soils around pile-raft foundation turning into plasticity was less than that around the raft foundation.