NUMERICAL SIMULATION OF PULL-OUT TEST ON CABLEBOLTS

Abstract

Bolting is an effective method for providing temporary and permanent support to roofs of tunnels, steep slopes, cliffs and vertical cuts and also for reinforcing dam structures. This report deals with the study of behaviour of grouted as well as non-grouted cable bolt using various models developed over time by various researchers. Due to presence of external loads, the bolt providing stability to the structure may fail which may create a hazardous situation in case of mining and construction activities. The failure may be due to the failure of bolt itself or the failure of grout (in case of grouted bolt) along the bolt grout interface or the grout rock interface. It is thus necessary to study the effect of variation of a number of factors on the pull-out resistance and hence the failure of bolt. The objective of this project is to study the pull-out behaviour of cablebolt. The model developed in the software focuses on understanding the influence of various dimensional and material properties of the bolt as well as grout on the pull-out test of the bolt. The factors include diameter and length of bolt, confining pressure, thickness of grout annulus and fiction angle for the grout material etc. As a part of the initial stage of the work, a thorough literature review had been conducted in the previous project.