In-situ tests for attenuation effect of cement grouting modified soil body on ground vibration
XU Zhaogang1,2, LOU Yu1, CHEN Liu1
1. Beijing Municipal Engineering Research Center of Micro-vibration Environment Control, China Electronics Engineering Design Institute Co., Ltd., Beijing 100142, China;
2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract：Improving the dynamic stiffness of subgrade soil is an effective measure to reduce the environmental vibration at high-tech facilities. Cement grouting is one of the effective engineering techniques to improve the dynamic stiffness of subgrade soil. Based on in-situ frequency sweep vibration test in which harmonic excitations at 5 to 100 Hz with steps of 0.5Hz were used as dynamic loading, the reduction effect of cement-improved gravel soil on ground vibration was investigated by measuring and comparing the ground vibration responses at the cement grouting area and the non-grouting area. The test results show that the cement-improved gravel soil can reduce the total root mean square velocity of the vertical ground vibration by 29.5% and the total root mean square velocity of the east-west ground vibration by 30.8%, but has little effect on the total root mean square velocity of the north-south ground vibration. In addition, the vibration reduction effect of the cement-improved gravel soil is discontinuous in the whole analyzed range of frequency, namely the root mean square velocities of ground vibrations at some frequencies are reduced and at others are amplified. However, overall, the reduction effect is greater than the amplification effect.
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