Research on Drilling Test of Grouting Rock Mass Based on Cutting Strength

Abstract

Grouting is an effective way to control the fractured surrounding rock in underground engineering. Quantitatively obtaining the strength parameters of grouting rock mass is very important for the grouting parameters rational design. Drilling tests of grouting rock masses with different water-cement ratios and particle sizes are carried out using the rock digital drilling test system. Based on the rock cutting mechanical model, the cutting strength of grouting rock is obtained. The response laws of different water-cement ratios and rock particle sizes on drilling parameters, cutting strength, and strength parameters are analyzed. On this basis, combined with the analysis of the relationship between grouting sandstone specimens’ strength and drilling parameters with different water cement ratios, a while-drilling testing model of grouting rock mass strength parameters based on cutting strength is established. It is a theoretical basis for quantitatively evaluating the strength of grouting surrounding rock while drilling in underground engineering.