| 岩溶区桥基下伏溶腔顶板安全厚度分析 |
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| 引用本文： | 姜贤平,王春雷. 岩溶区桥基下伏溶腔顶板安全厚度分析[J]. 铁道工程学报, 2010, 27(4) |
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| 作者姓名： | 姜贤平 王春雷 |
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| 作者单位： | 铁道第三勘察设计院集团有限公司,天津,300251 |
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| 摘 要： | 研究目的:以某客运专线岩溶区大桥为例,结合溶腔实际空间分布形态,对桥基荷载作用下溶腔岩体应力特征进行三维有限元分析,确定溶腔顶板的安全厚度.研究结果可为岩溶地区高速铁路、客运专线桥梁基础设计提供参考.研究结论:溶腔顶板厚度为30 m和25 m时,桥基附近岩体安全系数均在1.2以上,溶腔顶板安全系数在1.3以上,溶腔顶板是安全的;溶腔顶板厚度20 m时,溶腔洞周局部岩体安全系数约1.1,溶腔顶板基本是安全的,但岩体强度储备不足.本工程桥基荷载作用下溶腔顶板最小安全厚度约为20 m,对应基础最大埋深为13 m;基础设计埋深为8 m,溶腔顶板是安全的.
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| 关 键 词： | 溶腔顶板 客运专线 桥基荷载 岩溶 三维有限元 |
Analysis of Safe Roof Thickness of Karst Cavity under Bridge Load in Karst Area |
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| JIANG Xian-ping,WANG Chun-lei. Analysis of Safe Roof Thickness of Karst Cavity under Bridge Load in Karst Area[J]. Journal of Railway Engineering Society, 2010, 27(4) |
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| Authors: | JIANG Xian-ping WANG Chun-lei |
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| Affiliation: | JIANG Xian-ping,WANG Chun-lei(The Third Railway Survey , Design Institute Group Corporation,Tianjin 300251,China) |
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| Abstract: | Research purposes:Taking a bridge on one passenger dedicated line in karst area as an example and combining with the distribution pattern of the real space of karst cavity,the stress characteristics of rock mass under bridge load was analyzed with three-dimensional finite element to determine the safe roof thickness of karst cavity.The results could provide the reference to the design of bridge foundation of high speed railway in karst area.Research conclusions:The safety coefficient of rock mass nearby the... |
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| Keywords: | roof of karst cavity passenger dedicated line bridge load karst three-dimensional finite element |
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