Abstract: The prebored pressuremeter test has the characteristics of small soil disturbance, strong adaptability, and intuitive results. It is suitable for the exploration of the completely weathered granite. This article is based on the survey of the first section of the North Extension Channel Project of Qiaocheng East Road and provides a detailed introduction to the principles and testing process of the prebored pressuremeter test. The P-V curves of the completely weathered granite at the different exploration points in the study area were obtained through the on-site investigation, and the mechanical properties such as the shear modulus, pressuremeter modulus, and characteristic values of the soil bearing capacity were presented. The results show that the mechanical parameters related to the fully weathered granite gradually increase with the increasing of the testing depth. The characteristic values of the soil bearing capacity measured by the pressuremeter test are similar to but slightly larger than the results of the standard penetration test, which indicates the reasonableness of the pressuremeter test.

Key words: Pressuremeter Test, Completely Weathered Granite, Pressuremeter Shear Modulus, Pressure Modulus, Characteristic Value of Soil Bearing Capacity