Comparisons on the differences in numerical modelling methods between pre-bored pressuremeter and self-bored pressuremeter

Abstract

Numerical modelling has proved its versatility in assisting to solve many engineering problems. It has also opened many opportunities for interpretations of material testing which cannot be obtained by the means of analytical approaches alone. Numerical approach is one of the favourable alternatives in interpreting effective strength parameters of highly fractured and weathered rocks from pressuremeter tests. While there are many different types of pressuremeters nowadays, with different designs and tests procedures, the numerical modelling process might not be the same for every instrument. This paper serves to review the difference between two of the most common types of pressuremeters, namely pre-bored pressuremeters (PBPM) and self-boring pressuremeters (SBPM). The two instruments were compared in terms of their physical designs, working mechanisms, test procedure and most subsequently, the impact of their testing characteristics on the numerical modelling process.