| 隐伏岩溶条件下的上部结构-基础-地基共同作用数值模拟分析 |
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| 引用本文： | 张建同,陈顺军,刘素梅,林鲁生,徐礼华.隐伏岩溶条件下的上部结构-基础-地基共同作用数值模拟分析[J].中国岩溶,2018,37(5):792-798. |
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| 作者姓名： | 张建同 陈顺军 刘素梅 林鲁生 徐礼华 |
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| 作者单位： | 1.深圳市市政工程总公司，广东 深圳 518109/武汉大学，武汉 430072/深圳市龙岗区建筑工务局，广东 深圳 518172 |
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| 基金项目： | 中国博士后科学基金项目（2016M590717） |
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| 摘 要： | 基于龙岗区某超高层大夏，建立岩溶地基-基础-上部结构共同作用的有限元计算模型，模拟分析溶洞的应力、应变、位移及桩基础受力性能，并将分析结果与传统设计方法（上部结构与地基基础分离成两部分计算）进行对比分析，指出岩溶地基条件下传统设计方法的局限性。其研究结果表明:对于岩溶地基而言，共同作用对柱产生的次应力较小，但个别角柱次应力较大；剪力墙的次应力较大，且其布置方式对共同作用有较大影响，此应力随楼层的增加衰减很快；针对岩溶地基，筏板基础是比较适合的基础形式，在共同作用中起很大作用。
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| 关 键 词： | 岩溶 地基基础 共同作用 高层建筑 数值模拟 |
Numerical simulation analysis of interaction of superstructure-foundation-pile foundation under hidden karst condition |
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| ZHANG Jiantong,CHEN Shunjun,LIU Sumei,LIN Lusheng and XU Lihua.Numerical simulation analysis of interaction of superstructure-foundation-pile foundation under hidden karst condition[J].Carsologica Sinica,2018,37(5):792-798. |
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| Authors: | ZHANG Jiantong CHEN Shunjun LIU Sumei LIN Lusheng and XU Lihua |
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| Institution: | 1.Shenzhen Municipal Engineering Corp., Shenzhen, Guangdong 518109,China/Wuhan University, Wuhan, Hubei 430072,China2.Wuhan University, Wuhan, Hubei 430072,China3.Construction and Works Bureau of Longgang District, Shenzhen, Shenzhen, Guangdong 518172,China |
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| Abstract: | The research object of this paper is a super high-rise building in Longgang district, Shenzhen, with a total building area of 127，262 m2. The main building is a frame-tube structure with 44 floors above ground and 3 floors underground. The foundation is in the form of boring cast-in-situ pile, of which 44% of the piles have been installed in the area of karst caves. The stability of the karst caves and their influence on the overall structure should be considered in the construction process. The interaction of the superstructure, foundation ground and the pile foundation should be analyzed. In this paper, a conceptual model for the interaction of the three complements was hence established. Using finite element method to simulate the stress, strain, displacement and mechanical behavior of the pile foundation was conducted. The simulated results were analyzed and compared with those obtained by traditional design method which separated the upper structure and the pile foundation into two independent parts with no interaction in the numerical simulation. The comparative results shows that the stress difference of pile foundation increases with the increase of pile foundation stiffness; and the difference may reach 18.2%. Meanwhile along with the increase of the pile foundation stiffness, the overall stress of pile group increases by 13.7% and the average foundation ground settlement decreases by 4.9%, leaving little effect on the difference of foundation ground settlement. The simulated results also show that the interaction of the superstructure, foundation ground and pile foundation has a minor stress on the secondary stress acts on the building pillars. However, the secondary stresses of individual angular pillar and the shear wall are much large. The arrangement of the latter has a great influence on the interaction; and the stress decreases rapidly with the increase of the floor. Through this study, it is realized that in a karst area raft foundation is a suitable one, as plays an important role in adjusting the interaction of the three components. Based on the interaction method for analyzing the interaction of karst foundation ground, boring cast-in-situ pile foundation and the upper structure, the calculation results of pile foundation stress are uniform, the difference of ground settlement is small, and the stiffness of the superstructure can effectively solve the problem of uneven settlement of the foundation ground, which suggests that the stability of the karst foundation is good. |
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| Keywords: | karst pile foundation interaction high-rise building numerical simulation |
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