Near Surface Vs Profiling using MASW for rippability assessment of milliolithic limestone
Shear wave velocity (Vs) information of near surface strata is one of the critical parameters in soil dynamics and engineering geology. Milliolithic limestone deposits, commonly found in India, are present either as outcrops or at shallow depths with very less overburden. Rippability assessment were earlier based on qualitative assessments, equipment trial runs and laboratory estimates of seismic velocities, which had to be relied upon, as there were no tools available for direct determination of shear wave velocity in field. Seismic profiling using multichannel analysis of surface waves (MASW) provides good and reliable information not only to assess rippability characteristics, but also to know the near surface variation of the overlying strata. MASW method consists of data acquisition, data processing and shear wave velocity profiles. This paper provides a methodology of MASW tests conducted for rippability assessment of limestone. The study area consists of milliolithic horizontal bedded limestone formation resting over the trap (Basalt) rocks of Eocene age. Compressional wave velocity (Vp), one of the valuable by-product obtained from the seismic data set, is used to determine the rippability of limestone. Variation of seismic wave velocity of strata with depth & its rippability, is then determined from the seismic profiles.
P.B.Choudhury A.K.Chakraborty T.G.Sitharam
Dept. of Civil Engg., Indian Institute of Science, Bangalore, India Central Institute of Mining & Fuel Research, Nagpur Centre, India
国际会议
香港
英文
1-6
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）