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索连板球基础上拔机理
雒亿平1,2, 薛晶1, 言志信1,3
1.兰州大学 土木工程与力学学院, 兰州 730000;2.国网甘肃省电力公司经济技术研究院, 兰州 730050;3.河南城建学院 土木与交通工程学院, 河南 平顶山 467036
摘要:
针对既抗压又抗拔基础存在的缺陷和不足,尤其是特殊场地条件下施工困难的问题,构建了索连板球基础。该基础主要由水泥土柱、上板、下球体和须发锚索4部分构成,其中水泥土柱、下球体与须发锚索构成球索基础,由该球索基础承担上拔力。通过理论推导和数值模拟,分析了球索基础的抗拔机理及其与土体之间的相互作用,以及球索基础周围土体的变形开裂过程,揭示了球索基础的变形破坏规律和上拔力与埋深比之间的关系。
关键词:  球索基础  极限上拔力  抗拔机理  埋深比
DOI:10.11835/j.issn.1674-4764.2018.06.004
分类号:TU476
基金项目:国家电网公司科技项目资助(KJ〔2013〕9、SGTYHT/13-JS-175)
Uplift mechanism of foundation of plate and ball connected by anchor cable
Luo Yiping1,2, Xue Jing1, Yan Zhixin1,3
1.School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, P. R. China;2.The Research Institute of Economics and Technology of Gansu Province Electric Power Company, State Grid Corporation of China, Lanzhou 730050, P. R. China;3.School of Civil and Transportation Engineering, Henan University of Urban Construction, Pingdingshan 467036, Henan, P. R. China
Abstract:
An anchor cable connecting plate and ball was developed mainly for overcoming deficiency of current foundation subjected to both compressive and pull-out stresses, as well as the difficulty of construction in problematic ground conditions. The basis primarily consists of the cement soil column, the upper plate, the lower ball and the beard anchor. The cement soil column, lower ball and the beard anchor formulate the ball cable foundation, which handles the uplift force. Combining theoretical analysis with numerical simulation, the anti-tensile mechanisms of the ball cable foundation were explored, and the interaction between the ball cable foundation and soil mass was investigated. Moreover, we also studied the deformation process of the soil mass surrounding the ball cable foundation. The results revealed the evolving law of the deformation of the soil mass surrounding the ball cable, and the relationship between the uplift force and the bury depth.
Key words:  ball and cable foundation  extreme uplift force  resistance uplift mechanism  buried depth ratio
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