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題名 | 都會區深開挖工程窄巷效應之案例=Case Histories on the Narrow Lane Effects for Deep Excavations in Urban Area |
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作者 | 簡茂洲; 簡子崴; Chien, Mao-chou; Chien, Tzu-wei; |
期刊 | 地工技術 |
出版日期 | 20140600 |
卷期 | 140 2014.06[民103.06] |
頁次 | 頁27-36 |
分類號 | 441.13 |
語文 | chi |
關鍵詞 | 深開挖; 窄巷效應; 壁體變位; 地表沉陷; Deep excavation; Narrow lane effect; Wall deformation; Ground settlement; |
中文摘要 | 本文討論都會區深開挖工程一類較為異常之現象,即所謂之「窄巷效應」(Narrow lane effect)。窄巷效應乃是因都會區相鄰深開挖基地間往往僅有一巷之隔,兩基地開挖之主被動區交互重疊,且土壤受到兩次擋土及開挖作業之擾動,致使後施工開挖基地之擋土結構變位遠大於預期,且兩深開挖基地間窄巷之地表沉陷較經驗值亦超過甚多。就土壓力理論而言,兩基地間所夾之土壤為有限寬度之土體,且受巷道兩側擋土牆之束制,其作用於新建工程擋土牆之土壓力應低於理論主動土壓力,故新建工程窄巷側之擋土壁側向變位應低於預期,而壁體變位所引致之地表沉陷亦應低於預期。但有某些相鄰深開挖工程所表現之行為與預期狀況相反,窄巷側之壁體變位及地表沉陷皆遠超過其他側之數值。本文以實際案例呈現窄巷效應所造成之影響,希能提供學術研究及設計者對深開挖行為分析的新思考方向。 |
英文摘要 | This paper presents a less known phenomenon in the field of deep excavation, namely, the narrow lane effect. The narrow lane effect describes the overlapping effects on the active and passive pressures of two adjacent deep excavation sites separated only by a narrow lane. As noted in the field, the lateral deformation of retaining wall and the associated ground settlement as a result of the narrow lane effect often exceed the empirical values by a large margin. It is a general belief that the soil mass sandwiched between two adjacent sites tends to yield less active pressure compared to that of an unconfined soil mass, and as a consequence, the resulting lateral wall deformation and ground settlement should be less than expected. However, the field behaviors of some deep excavations show the contrary, wall deformation and ground settlement on the narrow lane side are much higher than other sides free of the effects of adjacent basement. This paper presents case histories that exhibit narrow lane effects. It is hoped that these data serve as a good reference to designers and can be used by academic field as a basis for future researches. |
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