Measurement of Shear Wave Velocity During Microbial Grouting Based on Bender Element Tests
The improving effect of liquefiable sand strengthened by microbes was influenced by bacterial volumes and transfer rates of slurry in the grouting,redistribution of pores,and etc.Due to differences of internal qualities,densities and other factors caused by preparation for specimens in actual application,it was difficult to scientifically judge the mineralization effect in specimens,thereby,the application of the microbial induced carbonate precipitation(MICP)technique in sites was restricted.The existing experi-mental study on microbial induced carbonate precipitation was in unit scales,rarely in sand column scales.Therefore,multi-point and real-time monitoring was conducted on sand columns(in a length of 0.5 m)in the process of microbial grouting with the self-developed multi-point and multi-channel measurement device of bender elements for shear wave velocity,and the mineralization effect of microorganisms in specimens was expressed in stages.It was verified that the multi-point shear wave velocity measurement device could be explored the real-time MICP mineralization situation in specimens.
MICPsand columnshear wave velocitybender elementmulti-channel monitoring system
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