Abstract：
The rock assessment system of Q and the Q formula proposed by Barton et al. represent the engineering geological and hydrogeological conditions of surrounding rocks in terms of rock integrity, development of a structural plane, and groundwater and crustal stress. One shortcoming of the system, however, is its lack of consideration regarding the effects of macroscopic geologic structures and topographic features. Based on theoretical analysis and numerical simulation, this paper puts forward three correction factors, i.e. the fold coefficient Kfo, fault coefficient Kfa and topographical coefficient Ktf, and gives a specific range of values to correct the Q value in regards to a concrete project, which reflects the effects of engineering geologic structures and topographic features on the Q value.
ZHANG Jun-Ru,
CHOU Wen-Ge
.Analysis of the Effects of Geologic Structures and Topographical Features on the Rock Assessment Coefficient Q Proposed by N. Barton[J] MODERN TUNNELLING TECHNOLOGY, 2011,V48(6): 38-42
2011, Vol. 48 