新加坡地铁环线C824标段失事原因分析(三)--反分析的瑕疵与施工监测不力被引量：10

Causation Analysis of Singapore MRT Circle Line C824 Nicoll Highway Collapse (Part Ⅲ)——Technically Breaching Back Analysis and Insufficient Instrumentation

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摘要 2004年4月20日下午3:30,新加坡地铁环线C824标段的一段明挖区间隧道发生严重的坍塌事故[1],事故发生后对事故原因的调查工作随即展开。通过为期一年的全面深入调查,最终形成了各方认可的一致意见和权威的调查分析报告。调查分析报告表明:基于地下连续墙的变形实测数据进行的反演分析,简单地采取了折减参数拟合曲线的方法,没有对折减后的参数寻求物理意义和力学解释,未对整个围护体系的总体安全性进行评估等,存在诸多的技术瑕疵;施工监测,尤其是支撑轴力的监测也存在诸多问题,如使用有缺陷的支撑轴力应变计,应变计的数量也不符合要求,应变与应力间的换算系数也有错误。调查专家组也把反分析存在技术瑕疵和施工监测不力作为失事的原因。在文献[1,2]的基础上,文章重点介绍了工程实施过程中反分析和施工监测的总体情况、存在的问题以及产生的后果等。 The causation investigation was carried out immediately after Singapore MRT circle line C824 Nicoll highway collapse occurred at approximately 3：30pro 20th April 2004. A comprehensive and intensive investigation report was provided by expert panel after one year investigation. The said report revealed that a number of technical flaws were amid the back analysis which was conducted with trial-error method with D/Wall deflection readings, these flaws include that no proper interpretation was provided for the discounted parameters in back analysis, and no safety assessment based on back analysis results was carried out for the whole retaining system. Many technically breaehing issues were found in instrumentation as well especially in strut force monitoring, such as malfunctioned strain gauges were used, quantity of strain gauges was insufficient and wrong coefficient was adopted in the strain - stress formula, etc. Based on above mentioned reasons, technically breaching back analysis and insufficient instrumentation was treated as causation of big collapse. On the basis of papers , the general situation, major technically breaching issues and relevant consequences of back analysis and instrumentation are addressed in this paper.

作者肖晓春袁金荣朱雁飞

机构地区上海隧道工程股份有限公司.上海上海市隧道工程与轨道交通设计研究院

出处《现代隧道技术》 EI 北大核心 2010年第1期22-28,共7页 Modern Tunnelling Technology

关键词 Nicoll大道塌方深开挖有限元分析反分析试参数法施工监测 Nicoll highway collapse Deep excavation FEM Back analysis Trial and error curve fitting Instrumentation

分类号 U458.3 [建筑科学—桥梁与隧道工程] U456.3 [建筑科学—桥梁与隧道工程]

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参考文献7

1肖晓春,袁金荣,朱雁飞.新加坡地铁环线C824标段失事原因分析(一)——工程总体情况及事故发生过程[J].现代隧道技术,2009,46(5):66-72. 被引量：31
2肖晓春,袁金荣,朱雁飞.新加坡地铁环线C824标段失事原因分析(二)——围护体系设计中的错误[J].现代隧道技术,2009,46(6):28-34. 被引量：15
3COI (2005),Report of the Committee of Inquiry into the Incident at the MRT Circle Line Worksite that Led to Collapse of Nicoll Highway on 20 April 2004[R],Ministry of Manpower,Singapore.
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7B.C.Bell S.P.Chiew,Nicoll Highway Collapse-Some structure observations:Part 2-Soil Retaining System[C],International Conference on Deep Excavations 28-30 June 2006,Singapore.

二级参考文献15

1COI (2005), Report of the Committee of Inquiry into the incident at the MRT circle line worksite that led to collapse of Nicoll Highway on 20 April 2004[R], Ministry of Manpower, Singapore.
2A.J. Whittle, Nicoll Highway Collapse: evaluation of geotechnical factors affecting design of excavation support system [C], International Conference on Deep Excavations 28-30 June 2006, Singapore.
3R.V.Davies, S.T.Poh, Nicoll Highway Collapse: field measurements and observations [C], International Conference on Deep Excavations 28N30 June 2006, Singapore.
4S.P. Chiew, B.C.Bell Nicoll Highway Collapse - Some structure observations: Part 1 - Strut Waler connection [C], International Conference on Deep Excavations 28-30 June 2006, Singapore.
5B.C.Bell S.P. Chiew, Nicoll Highway Collapse - Some structure observations: Part 2 - Soil Retaining system [C], International Conference on Deep Excavations 28-30 June 2006, Singapore.
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8COI (2005). Report of the Committee of Inquiry into the incident at the MRT circle line worksite that led to collapse of Nicoll Highway on 20 April 2004[R]. Ministry of Manpower, Singapore.
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10R.V.Davies, S.T.Poh. Nicoll Highway Collapse: field measurements and observations[C]. International Conference on Deep Excavations 28-30 June 2006, Singapore.