CAJ | 학술논문

南水北调中线穿黄工程是一期总干渠的关键性工程,其抗震安全备受关注。本文采用动态三维有限元方法,分析研究穿黄隧洞北岸竖井及相邻隧洞段的地震响应。分析中采用等价线性法计入基础土体在地震动作用下的模量下降及阻尼增加变化。分析计算模型包含竖井和隧洞结构以及结构周边一定范围的土体以有效模拟土体与结构间的动力相互作用,同时,计算模型采用阻尼边界模拟有限土体以外地基的辐射阻尼效应、采用非线性接触算法模拟隧洞管段间在地震时的开合与错动。分析结果显示,由于竖井和隧洞结构的显著差异,靠近竖井的隧洞接缝在地震中较易发生张开与错动,应予以高度重视,采取必要的抗震措施。分析研究结果为穿黄隧洞竖井段抗震安全评价提供科学依据。
남수북조중선천황공정시일기총간거적관건성공정,기항진안전비수관주。본문채용동태삼유유한원방법,분석연구천황수동북안수정급상린수동단적지진향응。분석중채용등개선성법계입기출토체재지진동작용하적모량하강급조니증가변화。분석계산모형포함수정화수동결구이급결구주변일정범위적토체이유효모의토체여결구간적동력상호작용,동시,계산모형채용조니변계모의유한토체이외지기적복사조니효응、채용비선성접촉산법모의수동관단간재지진시적개합여착동。분석결과현시,유우수정화수동결구적현저차이,고근수정적수동접봉재지진중교역발생장개여착동,응여이고도중시,채취필요적항진조시。분석연구결과위천황수동수정단항진안전평개제공과학의거。
The tunnel crossing the Yellow River is the key project for the central route of South-to-North Water Diversion in China.The seismic response of part of tunnel close to the shaft of the north end was analyzed with three-dimensional FEM.The nonlinearities of the soil under dynamic load were approached with equal linear method with SHAKE.The converged modulus and ratio of damping were used in the three dimensional dynamic analyses,where the interactions between the soil and structure were taken into account,the effect of energy radiation was simulated with damping boundary on the outsides of the finite region,the opening and sliding between the sections of the tunnel were simulated with direct contact method. The results of the study show the prevailing swing motion of the shaft creating opening and sliding between the tunnel sections.The results also provide valuable data for the judgment of seismic safety of the part of tunnel close to the shaft.