【作者】 王明斌； 李术才； 蔚立元； 秦昊；

【Author】 WANG Ming-bin~(1,2),LI Shu-cai~2,YU Li-yuan~2,QIN Hao~2 (1.School of Science,Shandong Jianzhu University,Jinan 250101,China; 2.Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250061,China)

【机构】 山东建筑大学理学院； 山东大学岩土与结构工程研究中心；

【摘要】 针对核废料深埋处置遇到的热力耦合问题,研究一个深埋衬砌隧道热力响应下的附加应力场问题.考虑全场的应力变形特征,运用复变函数的罗朗级数展开技术,构造合适的应力函数,结合边界条件和无穷远的性态,获得了全场复势的解析表达,对孔口应力的敏感性分析显示:相对于无衬砌的情况,软衬砌的存在可以有效降低孔口应力,当衬砌厚度达到某个值时,孔口应力最小,过厚、过薄的衬砌对降低孔口应力都是不利的;对于硬衬砌隧道,当衬砌厚度达到某个值时,会出现应力集中现象,为了降低孔口应力,必须增加衬砌厚度;在一定情况下,由于热膨胀产生的热应力,也可以降低孔口应力.更多还原

【Abstract】 According to the current situation of the coupled action of mechanical and thermal load occurring in the disposal engineering of nuclear wastes,the problem of additional stress fields for a circular lined tunnel considering the effect of the thermal response was investigated.By considering the stress-deformation characteristic of the total fields and applying the technique of series expansion,the appropriate stress functions were constructed and accordingly the complex potentials for every region were obtained. The sensitivity analyses for the hole stresses of the tunnel indicated that,compared with the unlined case,the existence of a soft liner can effectively weaken the hole stresses which will obtain a minimal value when the liner thickness reaches a certain magnitude for a fixed liner rigidity.For a stiff liner,the stress concentration will take place when the Uner thickness gets up to certain value for fixed liner rigidity,and an increment of the liner thickness is needed in order to decrease the hole stresses.To a certain extent,stresses resulting from thermal expansion can counteract the hole stresses.更多还原