EFFECT OF WEATHERING ON STRENGTH AND DEFORMATION OF SEDIMENTARY ROCK

Abstract

Weathering is a natural process in all type of igneous, sedimentary and metamorphic rock occurring more than great many years under fluctuated ecological conditions. Weathering can be physical, chemical or biological in various natural conditions in gentle to outrageous environmental factors. Sedimentary rocks are itself formed by erosion, weathering followed by lithification of pre-existing rocks and modifies its physical and chemical properties. Further weathering in sedimentary rock, physical or chemical alter its composition and effect the strength and chemical properties of the rock, thus laboratory-based tests are carried out to know about the soundness of rock. This study is principally credited to examine the strength of sedimentary rock simulating sea condition and its impact on the strength of the rock because of variation in salinity of sea water, along these lines it could help in evaluating the strength which would be valuable in different applications, for example in deep drilling aquifers for extraction of oil and gases. This investigation in this way plans to perform tests on sedimentary rocks of Vindhyan range extending close to Kota city and study the uniaxial unconfined compressive strength test with changing concentrations of the saltiness levels (10%, 20%, 30%) of NaCl arrangement with time variation. The tests were performed in time gaps for example after 30, 60, 90 and 300 days to check the impact of time and salinity on quality of the stone in the research work. In spite of the fact that it is hard to make a similar level of confinement and pressure conditions, efforts were made to simulate sea-salt weathering conditions by putting the rock samples in cannisters of saline solution arrangement of 10%, 20% and 30% for long timespans.