Abstract Settlement occurred at an existing building during shield construction of Tianjin Metro Line 3 due to ground water leakage. Based on the measured data, a numerical simulation was adopted to analyze the grouting lifting effect on the existing building under the condition of water leakage, and the effects of location of the grouting points and grouting time on the grouting lifting and tunnel were also analyzed. The research results show that the compensation grouting rate is relatively high and the required grouting volume for the shallow-hole grouting is obviously much less than that of deep-hole grouting, but the fluctuation of the compensation rate is large and the building inclination increases significantly; the bending moment of the tunnel increases sharply because of the grouting pressure during deep-hole grouting, it is 2.7 times greater than that for shallow grouting, and the influential scope of tunnel bending is around 1.5 times the grouting width; and with proper timing of the grouting, the building inclination increment is relatively small while the lifting of the measuring points and the compensation grouting rate increase significantly, and the effect of grouting lifting is better.
Abstract��
Settlement occurred at an existing building during shield construction of Tianjin Metro Line 3 due to ground water leakage. Based on the measured data, a numerical simulation was adopted to analyze the grouting lifting effect on the existing building under the condition of water leakage, and the effects of location of the grouting points and grouting time on the grouting lifting and tunnel were also analyzed. The research results show that the compensation grouting rate is relatively high and the required grouting volume for the shallow-hole grouting is obviously much less than that of deep-hole grouting, but the fluctuation of the compensation rate is large and the building inclination increases significantly; the bending moment of the tunnel increases sharply because of the grouting pressure during deep-hole grouting, it is 2.7 times greater than that for shallow grouting, and the influential scope of tunnel bending is around 1.5 times the grouting width; and with proper timing of the grouting, the building inclination increment is relatively small while the lifting of the measuring points and the compensation grouting rate increase significantly, and the effect of grouting lifting is better.
2017, Vol. 54 