Abstract：
Taking the underground package 1 of Kuala Lumpur MRT project as an example, based on 3D Horn's wedge failure mechanism, it adopted limit equilibrium analysis to derive a calculation method for shield chamber support pressures in 3 different cases of full-chamber soil, half-chamber soil or soilless under the acting of earth pressure and full water head pressure, and verified it with the combination of integral analysis and local analysis. The calculation results show that there are totally 5 factors affecting on soil chamber support pressure, i.e. water level, thickness of overburden, cohesion, the internal friction angle of overburden soil and the internal friction angle of soil in working face. Furthermore, a sensitivity analysis of these factors was carried out. It was found that ground settlements have met the design requirements by analyzing the in-situ monitoring data and applying the calculated soil chamber support pressure in construction practice.
2015, Vol. 52 