地铁振动荷载作用下隧道土体变形数值模拟  被引量:28

Numerical Simulation of Saturated Soft Clay's Deformation Around Tunnel Under Subway Vibrational Loading

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作  者:唐益群[1] 栾长青[2] 张曦[1] 王建秀[1] 杨坪[1] 

机构地区:[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092

出  处:《地下空间与工程学报》2008年第1期105-110,共6页Chinese Journal of Underground Space and Engineering

基  金:国家自然科学基金(No.40372124)资助项目;上海市重点学科(地质工程)建设项目资助(项目编号:B308)

摘  要:上海地区地铁隧道主要埋设于第③层淤泥质粉质粘土和第④层淤泥质粘土层中,根据长期监测资料的分析,地铁列车的振动对隧道周围土体强度和变形有较大的影响。利用室内动三轴试验结果确定土体的动弹性模量,采用数值模拟的方法计算饱和软粘土地区地铁振动荷载作用下隧道周围土体的变形,由此进一步计算出地铁振动荷载作用下引起的地面沉降量。通过计算的地面沉降量与实测值比较,其结果与工程实际相吻合。因此可以利用此方法对地铁运营后的沉降量进行评价和预测,为地铁工程的设计、安全运营以及对周围建筑物的影响提供有价值的参考。The subway tunnel of Shanghai lies in the 3'd layer, mucky silty clay, and the 4th layer, mucky clay. According to long - term monitor datum analysis, the strength and deformation of soil around the subway tunnel is greatly affected by vibration of the subway train. In the paper, the dynamic elastic modulus of soil is determined by laboratory dynamic triaxial tests, and the deformation of soil around subway tunnel under subway vibrational loading is computed with numerical simulation, then, the ground subsidence induced by subway vibrational loading is calculated. The results are identical with those from the engineering project by contrast with the monitor datum. So the subsidence after subway operation can be evaluated and forecasted by the method, and it can offer valuable reference for design, safe running and evaluation of influence on surrounding building of subway project.

关 键 词:地铁振动荷载 隧道 土体变形 动弹性模量 数值模拟 有限元计算模型 

分 类 号:TU411.8[建筑科学—岩土工程]

 

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