影响核岛抗震性能的软土地基处理中嵌岩桩布设关键因素研究  

Research on key influence factors of layout of rock-socketed piles in soft ground improvement over the seismic performance of Nuclear Power Plant

作　　者：陈超 尹训强[2] 朱秀云[3] 

机构地区：[1]中核华电河北核电有限公司,河北沧州061000 [2]大连大学土木工程技术研究与开发中心,辽宁大连116622 [3]环境保护部核与辐射安全中心,北京100082

出　　处：《地震工程与工程振动》2017年第1期40-47,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家重大科技专项基金资助项目(2011ZX06002-10);辽宁省博士启动基金项目(201601309);优秀青年博士专项基金项目(2015YBL010)~~

摘　　要：软土地基嵌岩桩处理中桩径及布置形式是核岛厂房结构抗震安全评价需要考虑的关键影响因素。以某拟建核岛厂房实际项目为研究背景,在地基有限域施加黏性人工边界来模拟半无限地基辐射阻尼效应,通过等效线性迭代法描述近场非均质软土地基非线性动力特性,在有限元框架内以全耦合方式考虑群桩效应的影响,进而耦合上部核岛结构,建立了考虑核岛-桩-土相互作用的软土地基条件下核岛厂房结构地震响应计算模型;最后,根据工程实际情况,分别针对嵌岩桩的桩径与布置方式影响因素进行综合对比分析,得出其对核电厂房结构地震响应的影响规律。研究结果可为类似条件下的核岛厂房软土地基处理方案优化分析提供借鉴与参考。Study on the diameter and the arrangement of rock-socketed piles in soft ground improvement is of great important influence factors for the seismic safety evaluation of nuclear power plant. Considering pile-soil-structure dynamic interaction and combining the real situation for a proposed nuclear power plant, the calculation model of nuclear island under the condition of soft soil foundation is presented in the paper. Firstly, the model is developed by adopting numerical simulation method. Especially, the nonlinearity of the near-field foundation of the model is considered by using the equivalent linearization method, the radiation damping effect of infinite foundation is simu- lated by the introduction of viscous boundary, and the pile group effect is considered by the way of unity coupling within a finite element framework. Secondly, the influencing factor of the diameter and the arrangement of rock- socketed piles is compared and analyzed according to the practice. Finally, the law of nuclear island＇ s seismic re- sponse is provided. The experience and conclusions can be for reference under the similar conditions for the optimi- zation design of rock-socketed piles in the soft soil.

关 键 词：嵌岩桩 软土地基 核岛 布置形式 置换率 

分 类 号：TU43[建筑科学—岩土工程]