Forensic diagnosis of a leaking accident during excavation
Forensic diagnosis of a leaking accident during excavation
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挖掘过程中泄漏事故的法医诊断
DOI：
10.1061/(asce)cf.1943-5509.0001058
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发表时间：
2017-10
影响因子：
2.5
通讯作者：
陆烨
中科院分区：
文献类型：
--
作者：
谭勇;陆烨
上海某地铁车站基坑开挖深度为31.4-33.1m，开挖范围为上部不透水性粘土层至下部可蚀性粉砂含水层。2013年7月23日，当该坑北段接近底部时，突然发生地下水突出，坑底迅速被淹没。在随后的两天里，邻近的地面和建筑物相继发生了30 - 42毫米的下沉。为防止情况恶化，公司启动了应急预案，试图封堵水流通道，通过沿着发生渗漏的地下连续墙外周边和内周边分别施工搅拌桩和旋喷桩，成功封堵了水流通道。尽管如此，邻近地下水突出的建筑物遭受了长期的开挖后沉降。经法医鉴定，本次透水事故主要与两个因素有关：（1）对两周前出现的轻微渗漏不知情，未采取任何补救措施;（2）承压含水层中的板连接件存在缺陷。通过对现场监测数据的目视检查和回顾性分析，绘制了可能的渗漏、流动路径和相关的地面沉降带，并重建了受影响建筑物的沉降历史。从这次事故中吸取的合同和技术教训将有助于专业人员减轻或防止今后在挖掘过程中发生透壁渗漏。
Construction of a subway station in Shanghai called for a 31.4–33.1–m-deep excavation, which extended through upper impermeable.clayey strata into underlying erodible silt and sand aquifer layers. When the north section of this pit nearly bottomed out on July 23, 2013, a sudden.outburst of groundwater took place and the pit base was flooded quickly. In the subsequent two days, the adjacent ground and building successively underwent 30–42-mm settlements in a plunging manner. To prevent aggravation of the situation, a contingency plan was initiated quickly.in an attempt to seal off the water flow path. By constructing mixed-in-place and jet-grouting piles respectively along the outer and inner perimeters of the diaphragm wall where leakage occurred, flow channels were successfully blocked. Despite this, the building adjacent to the outburst of.groundwater suffered long-term postexcavation settlement. Forensic diagnoses show that this through-wall leaking accident was related to two.major factors: (1) ignorance of minor leakages emerging two weeks before without adopting any remedial measure; and (2) a flawed slab connector embedded in the confined aquifer layer. Based on visual inspection and retrospective analysis of field monitoring data, the possible leakage.flow path and associated ground subsidence zone were mapped and a settlement history of the affected building was reconstructed. Both contractual and technical lessons learned from this accident will be useful for professionals to mitigate or prevent future incidence of through-wall.leakage during excavation.
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DOI：
10.1061/(asce)cf.1943-5509.0000891
发表时间：
2016-12
影响因子：
2.5
作者：
Guo-bin Liu;P. Huang;Jiangwei Shi;C. Ng
通讯作者：
Guo-bin Liu;P. Huang;Jiangwei Shi;C. Ng
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1.7
作者：
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3.6
作者：
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通讯作者：
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影响因子：
5.8
作者：
J. F. Moore;T. Longworth
通讯作者：
J. F. Moore;T. Longworth
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影响因子：
6.9
作者：
Liao, Shaoming;Fan, Yaoyao;Shi, Zhenhao;Shao, Wei;Kong, Xiangpeng
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