海底隧道浅埋暗挖段CRD法不同施工工序比较 |
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引用本文: | 张建国,王明年,刘大刚,魏龙海,俞尚宇. 海底隧道浅埋暗挖段CRD法不同施工工序比较[J]. 岩石力学与工程学报, 2007, 26(Z2): 3639-3639 |
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作者姓名: | 张建国 王明年 刘大刚 魏龙海 俞尚宇 |
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摘 要: | 在建工程厦门东通道(翔安)海底隧道是我国大陆地区第一座海底隧道,陆域浅埋暗挖段地质条件较差,多为全、强风化花岗岩,且含水量高、强度低,因而采用CRD法施工,该施工段围岩条件差、结构跨度大,且国外相同工程条件下可借鉴的经验也较少。据此,对该施工段采用现场监控和数值模拟2种手段,分析了不同施工工序各部开挖对拱顶下沉、水平收敛及结构内力的影响,2种方法所得结果吻合良好。研究结果表明,在此特定隧道围岩条件下,CRD1,2超前与CRD1,3超前相比,各施工部的开挖引起拱顶下沉量的比例基本相同,但前者所引起的CRD1,3拱顶下沉量分别高出后者约70%,45%,而CRD1的绝对收敛值约大于后者15%,结构内力也略大于后者。以上研究成果为隧道的信息化施工提供了依据,也为今后的相关工程积累了经验。
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关 键 词: | 海底隧道浅埋暗挖现场监测数值模拟施工工序信息化施工 |
收稿时间: | 2007-06-17; |
COMPARISON OF DIFFERENT WORKING PROCEDURES BY CRD METHOD FOR SHALLOW-BURIED SUBSEA TUNNEL EXCAVATION |
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Abstract: | Xiamen East Passageway Xiang¢an subsea tunnel under construction is the first subsea tunnel in China. CRD method is adopted for the unfavourable geological conditions on shallow-buried excavation area through strong weathered granite,which holds higher water content and lower intensity. Due to the unfavourable geological conditions and no experiences referred to foreign similar projects,the method of combining in-situ monitoring with numerical simulation is employed to analyze the influence of different working procedures of settlements with convergence and internal forces of arch crown. The achieved results agree well with the analytical result. The research indicates that the proportion of settlement of arch crown by different steps is basically the same by the comparison between CRD1,2 excavation ahead and CRD1,3 on the geological conditions specifically,but settlement of arch crown on CRD1,3 by the first working procedure is approximately 70%,45% higher than the second one while convergence on CRD1 is about 15%. In addition,internal forces are a little higher than those of the second working procedure. The result can provide references to the information-oriented construction of tunnel as well as experience for similar projects. |
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Keywords: | subsea tunnel shallow-buried excavation in-situ monitoring numerical simulation working procedure information-oriented construction |
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