Title: Injection grouting to overcome artesian water pressure at Esholt Sewage Works
Abstract: : Whilst excavating shafts to facilitate settlement tank construction at Esholt Sewage works in the summer of 1990 an 11m head of artesian water pressure was encountered which failed at the base of a 10 m excavation. As a result heave of over 1 m occurred and the shaft flooded despite concerted pumping efforts. Well pumping was attempted to draw down the water table locally around the shaft but failed after pumping 30 million gallons of water in two weeks. Keller Colcrete designed a combined end of casing and tube-a-manchettes grouting solution to penetrate the permeable underlying sandstone from which the artesian pressure emanated. The works were carried out to four tanks over the summer of 1990. Pump out tests were carried out within the sheet piled shafts prior to excavation to verify that water inflow had been reduced. In 1991 Keller Colcrete returned to site to complete a further programme of treatment to an additional four shafts. The combined project therefore entailed 6900 m of drilling in 430 holes and the injection of 600 tonnes of grout comprising various mixes of cement, sand and bentonite. Introduction The onset of excavation problems Site investigation information Design of grouting solution Design parameters Modifications made to design parameters during grouting Analysis of grouting quantities Testing prior to excavation Excavation of the tanks following grout treatment Conclusions Reference
Publication Year: 1994
Publication Date: 1994-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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