昆明新机场航站区下伏溶洞地基承载力分析
摘要:溶洞地基承载力的影响因素众多。溶洞埋深、溶洞直径(跨度)、水平相邻溶洞的间距,竖向相邻溶洞的间距及溶洞断面形态等对地基的承载力影响很大。应用工程地质分析和数值模拟相结合的方法,对昆明新机场下伏溶洞地基承载力进行了分析,得出当单个溶洞埋深大于2倍直径后,上部荷载与下部溶蚀空间的关系较小。当水平相邻溶洞的间距大于1倍跨度以及当竖向相邻溶洞间距大于0.5倍跨度后,可以忽略溶洞对上部荷载的影响。溶蚀率每增加5%,上部最大荷载qmax降低幅度约6%~10%。当跨度大于3倍洞高时,上部最大荷载的降低幅度相对较小,竖向型溶洞所能承受的荷载相对较大。
Abstract:There are many factors that affect bearing capacity of Cave foundation, such as Cave depth, the caves diameter (span), spacing vertically adjacent caves and caverns section form the foundation bearing capacity. The way, combined engineering geology analysis with numerical simulation, was applied to analyze the underlying bearing capacity of Cave foundation. According to this way, it concludes that the relationship between the diameter of the upper load and the lower part of the dissolution is smaller when a single cave depth is greater than 2 times, and the impaction of the cave to the top load can be ignored when the spacing of the level of the adjacent cave is greater than one times and the vertical distance is greater than 0.5 times of the span. Besides, the upper part of the maximum load qmax decrease about 6% to 10% from each additional 5% of dissolution rate. When the span is greater than three times of the hole high, the decrease range of the maximum load on the top of foundation is relatively small; on the contrary, the load that vertical type caves can withstand is relatively large.
中文标题：
昆明新机场航站区下伏溶洞地基承载力分析
The Carrying Capacity Analysis of Kunming New Airport Terminal Area Underlying Cave Foundation
作者：
邓杰文,彭大雷,刘宏
Deng Jiewen,Peng Dalei,Liu Hong
作者简介:邓杰文,1986年生,男,汉族,贵州瓮安人,岩土工程专业研究生。研究方向:高边坡与硐室稳定性。E-mail:xiaofei6668@126.com
通讯地址：
喀斯特环境与地质灾害防治教育部重点实验室(贵州大学), 贵州贵阳 550003
KeyLaboratoryofKarstEnvironmentandGeohazardPrevention,MinistryofEducation(GuizhouUniversity)Guiyang550003,Guizhou,China
中图分类号:P642.25;TU431
doi:10.3969/j.issn.1007-2993.2012.05.011
出版物：岩土工程技术
收稿日期:2012-08-08
网络出版日期:2021-07-06
关键词:昆明新机场,下伏溶洞地基,数值模拟,承载力
Key words:Kunming New Airport,Underlying cave foundation,numerical simulation,Carrying capacity
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基金项目：
基金项目: 贵州省优秀青年科技人才培养专项资金项目(黔科合人字2009—23)
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