Proceedings of DFI-India 2019: 9th Conference on Deep Foundation Technologies for Infrastructure Development in India, (DFI)
A Case Study on Pressuremeter Test in Katni, Madhya Pradesh, India
Kuppala Venkata Sivannarayana, Arnab Banerjee, and Subhasish Pasupalak
The longest railway elevated corridor measuring around 18KM including 12KM at grade is proposed to be constructed at Katni, Madhya Pradesh, India which comes under Western Central Railway. As a part of detailed design work geotechnical investigation work was carried out. Pressuremeter test (PMT) is adopted as high quality in-situ testing of soil strata. The geological profile of Katni is characterized by a top alluvial deposit followed by limestone formation either in solid rock form or as a residual soil having high plastic clay characteristics. At deeper depths due to higher SPT ‘N’ values, it is difficult to penetrate thin tube sampler for the collecting undisturbed samples. As a common geotechnical practice, undrained shear strength (Su) of soil is evaluated based on the available correlation with SPT N for computation of pile capacity. In this project an attempt was made to evaluate the in-situ undrained shear strength of soil through pressure meter test. This paper covers the investigation process of PMT, the challenges faced during the investigations, and along with the analysis of the PMT results. The analysis of PMT results includes the interpretation of Pressure meter modulus (EPMT), limit pressure (PL) and undrained shear strength of soil.
|article #3298; publication #1059 (India2019)|