| 外坑支护结构转动时坑间被动区土拱效应分析 |
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| 引用本文： | 胡辉,汤连生,林兴立,匡飞. 外坑支护结构转动时坑间被动区土拱效应分析[J]. 长江科学院院报, 2015, 32(4): 101-108. DOI: 10.3969/j.issn.1001-5485.2015.04.020 |
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| 作者姓名： | 胡辉 汤连生 林兴立 匡飞 |
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| 作者单位： | 1. 中山大学 a.地球科学与地质工程学院;b.工学院,广州 510275;2.暨南大学 重大工程灾害与控制教育部重点实验室,广州 510632 |
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| 基金项目： | 国家自然科学基金，全国高等学校博士学科专项科研基金，广东省自然科学基金，广东省科技计划联合资助项目 |
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| 摘 要： | 为研究支护结构受力与变形特点,分析了坑中坑式基坑坑间区土体的成拱作用。当外坑支护结构绕底端转动时,利用土拱效应分析方法,推导了被动土压力表达式;定义了内外坑支护结构相对位移比,以此描述内坑支护结构位移对外坑支护结构被动土压力的影响,得到土压力呈非线性分布。工程算例对比分析表明土压力分析方法能更好地反映土拱效应及坑间距对作用在外坑支护结构上土压力的影响,以此土压力值用于基坑支护结构设计相比采用库仑理论计算值偏于安全;当内坑支护结构不发生位移时,坑间距越小、支护结构相对位移比越大,外坑支护结构所受到的被动土压力愈大,说明提高内坑支护结构支撑刚度有利于控制外坑支护结构的变形。研究成果对分析基抗支护结构安全问题,具有一定的参考价值。
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| 关 键 词： | 坑中坑 土拱效应 基坑 被动土压力 相对位移比 |
| 收稿时间： | 2013-11-08 |
| 修稿时间： | 2014-03-25 |
Soil Arching Effect in the Passive Zone Between Internal Pit and External Pit When the Outer Supporting Structure Rotates |
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| HU Hui,TANG Lian-sheng,LIN Xing-li,KUANG Fei. Soil Arching Effect in the Passive Zone Between Internal Pit and External Pit When the Outer Supporting Structure Rotates[J]. Journal of Yangtze River Scientific Research Institute, 2015, 32(4): 101-108. DOI: 10.3969/j.issn.1001-5485.2015.04.020 |
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| Authors: | HU Hui TANG Lian-sheng LIN Xing-li KUANG Fei |
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| Affiliation: | 1.School of Earth Sciences and Geological Engineering, Sun Yat-sen University,Guangzhou 510275, China; 2.School of Engineering, Sun Yat-sen University, Guangzhou 510275, China;3.Key Laboratory of Engineering Disaster Forecast and Control under Ministry of Education, Jinan University, Guangzhou 510632, China |
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| Abstract: | The soil arching effect in the passive zone between the internal pit and external foundation pit was ana-lysed based on the stress and deformation features of supporting structure.A formula of passive soil pressure is es-tablished by using the theory of soil arching effect when the supporting structure of the external pit rotates around the bottom.A conception of the relative displacement ratio is put forward to describe the change of earth pressure in the external pit when the structure of the internal pit has displacement.The calculated earth pressure is nonlinear. The calculation results of engineering example prove that the method in this research could better reflect the impact of soil arching effect and pit-to-pit distance on earth pressure than classical methods.It also shows that this new method is safer than Coulomb’s earth theory when designing the supporting structures.When there is no displace-ment of the internal pit supporting,the smaller distance between two pits,the bigger relative displacement ratio of supporting structures and the bigger passive earth pressure will be,which means that improving the interior support-ing stiffness is beneficial to controlling the deformation of the external pit supporting. |
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| Keywords: | pit in foundation pit soil arching effect foundation pit passive soil pressure relative displacement ratio |
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