Study on Microtremor Surver Technology in Karst Collapse in Liancheng County
Array comparison of observation stations at karst collapse sites and test of microtremor apparent S-wave velocity at known drilling points,then the cross-section is further arranged for the Microtremor Surver in the study area.Experimental studies and detection results show that,the triple-circle nested array is the best choice for the Microtremor observation array,but its high frequency band dispersion spectrum energy concentration and continuity is not as good as linear array and L-shaped array.In Miaoqian area the basic principle of judging karst development is the relatively low velocity anomaly in the contact between limestone and sandy soil,or the apparent velocity in limestone is less than 650 m/s.Therefore,it is judged that karst development in this area.Through the establishment of three-dimensional velocity structure map of underground space,the spatial morphology of karst development can be visualized,which provides a certain advantage basis for accurately discussing the mechanism of overlying karst/karst cave development.
microtremor surverkarst collapsearray contrastLiancheng County
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