Groundwater control for construction in the Lambeth Group

IF 0.3 Q4 ENGINEERING, GEOLOGICAL
M. Preene, T. Roberts
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引用次数: 6

Abstract

Excavations in the Lambeth Group often encounter groundwater problems. This is related to the variable nature of the Lambeth Group soils and the presence of permeable water-bearing layers of sand, silt and gravel, where groundwater inflows can lead to instability. The permeability of the water-bearing layers can vary within a wide range. The pore water pressure and associated piezometric head in each layer can be difficult to predict, as the piezometric profile may diverge from the hydrostatic, under the influence of underdrainage from the Chalk Group and Thanet Sand Formation, which forms the lower aquifer beneath the Lambeth Group. Stability of excavations can be improved by using groundwater control techniques to reduce pore water pressures in permeable layers. Suitable methods, including active and passive pressure relief and underdrainage are discussed, and case histories presented.
兰贝斯集团施工地下水控制
兰贝斯群的开挖经常遇到地下水问题。这与兰贝斯群土壤的多变性质和沙土、淤泥和砾石渗透性含水层的存在有关,地下水流入可能导致不稳定。含水层的渗透率可以在很宽的范围内变化。由于白垩组和Thanet砂组(在Lambeth组下方形成含水层)的下泄液影响下,压力剖面可能偏离静水剖面,因此很难预测每一层的孔隙水压力和相关的压头。利用地下水控制技术降低透水层孔隙水压力,可以提高基坑的稳定性。讨论了主动泄压、被动泄压和欠泄压的合适方法,并给出了实例。
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来源期刊
Geotechnical Engineering
Geotechnical Engineering ENGINEERING, GEOLOGICAL-
CiteScore
0.50
自引率
0.00%
发文量
0
期刊介绍: The objectives of the Association shall be the promotion of co-operation among geotechnical societies in SE Asia; and the assistance to member societies who have limited number of members. Now there is only one combined web titled: AGSSEA-SEAGS. SEAGS & AGSSEA encourage the submission of scholarly and practice-oriented articles to its journal. The journal is published quarterly. Both sponsors of the journal, the Southeast Asian Geotechnical Society and the Association of Geotechnical Societies in Southeast Asia, promote the ideals and goals of the International Society of Soil Mechanics and Geotechhnical Engineering in fostering communications, developing insights and enabling the advancement of the geotechnical engineering discipline.
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