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Rock Mass Index (RMI) to Estimate the Shear Strength Parameters of the Rockmass: Case Study from Lesser Himalayas, Jammu & Kashmir, India
Rock Mass Index (RMI) is the method of rockmass classification system, which gives emphasis on the block size, joint characteristics and strength of intact rocks to express the UCS of the rockmass. The present work focuses on the applicability of RMI in the context of estimation of shear strength parameters, like angle of internal friction (Φ), cohesion (c), etc., and also the ‘m’ and ‘s’ constants for Hoek–Brown failure criterion from the Anji Khad in Lesser Himalayas of Jammu & Kashmir. Lithology comprises stromatolitic limestone and dolomite of Proterozoic Sirban Group, which has experienced a high degree of deformation due to the major thrusting activity (Reasi Thrust) in the region. The geological map of the area and geostructural scanline surveys has been done for demarcation of different zones (5 zones have been delineated) on the basis of types of discontinuity and degree of jointing. The input data for the calculation of shear strength parameters as well as ‘m’ and ‘s’ constants of the H-B failure criterion were obtained from the characterisation of the joints, which were then processed. The results were very much comparable with the data obtained by in situ shear tests performed in the region earlier. In situ tests are often performed to get the shear strength parameters, but due to their operational difficulties, high cost and timing factors, the tests are not performed regularly which often create information gap and constructional problems in tunnels, the foundation of bridges, etc. Therefore, the method of estimation of shear strength parameters by RMi which is reliable and also cost- and time-effective, can be used extensively.
Rock Mass Index (RMI) to Estimate the Shear Strength Parameters of the Rockmass: Case Study from Lesser Himalayas, Jammu & Kashmir, India
Rock Mass Index (RMI) is the method of rockmass classification system, which gives emphasis on the block size, joint characteristics and strength of intact rocks to express the UCS of the rockmass. The present work focuses on the applicability of RMI in the context of estimation of shear strength parameters, like angle of internal friction (Φ), cohesion (c), etc., and also the ‘m’ and ‘s’ constants for Hoek–Brown failure criterion from the Anji Khad in Lesser Himalayas of Jammu & Kashmir. Lithology comprises stromatolitic limestone and dolomite of Proterozoic Sirban Group, which has experienced a high degree of deformation due to the major thrusting activity (Reasi Thrust) in the region. The geological map of the area and geostructural scanline surveys has been done for demarcation of different zones (5 zones have been delineated) on the basis of types of discontinuity and degree of jointing. The input data for the calculation of shear strength parameters as well as ‘m’ and ‘s’ constants of the H-B failure criterion were obtained from the characterisation of the joints, which were then processed. The results were very much comparable with the data obtained by in situ shear tests performed in the region earlier. In situ tests are often performed to get the shear strength parameters, but due to their operational difficulties, high cost and timing factors, the tests are not performed regularly which often create information gap and constructional problems in tunnels, the foundation of bridges, etc. Therefore, the method of estimation of shear strength parameters by RMi which is reliable and also cost- and time-effective, can be used extensively.
Rock Mass Index (RMI) to Estimate the Shear Strength Parameters of the Rockmass: Case Study from Lesser Himalayas, Jammu & Kashmir, India
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Muthukkumaran, K. (editor) / Vaidya, Ravikiran (editor) / Dhang, Pratap Chandra (author)
2021-11-24
11 pages
Article/Chapter (Book)
Electronic Resource
English
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