Abstract:

To solve the problem of traffic jams in Taipei and Kaohsiung in Taiwan, the construction of rapid transit system is built. The technique of shield tunneling is extensively used to tunnel works. The joining of the shaft and the tunnel is generally a highrisk work because of its potential dangers such as ground settlement and tunnel breaks. In this paper, a series of experiments with the model insitu in the laboratory are conducted and the characteristic of slag cement are studied by comparisons between laboratory samples and insitu cored samples. The investigating results might be used as reference for other ground improvement of shield tunnel works.

Key words: slag cement, ground improvement, shield tunnel