Excavation of Soft Ground Fortified with a Cement Hardening Agent

Construction of Senoogawa Drainage Pump Station

Abstract

The Senoogawa drainage pump station was constructed on soft ground consisting of Kojima-Bay clay. In the construction of Senoogawa drainage pump station, which was built on a large site, the soft ground was fortified with a cement hardening agent so as to use the open cut method. In advance of carrying out the excavation, two inclinometers were set up on the rear-side of the excavation area, and ground behavior due to the excavation was closely observed.
In this paper, first the engineering properties of Kojima-Bay clay, which were fortified with a cement hardening agent, were ascertained using laboratory test data. Second, the behavior of the newly fortified ground and soft ground around the fortified one due to the excavation were investigated on the basis of results of a field observation using two inclinometers. Lastly, the results of the numerical analysis using the finite element method (FEM) for the behavior of ground due to the excavation were compared with the results of the field observation.