The stability analysis of tunnels driven in jointed rock masses of Jahrom formation

2020 ◽  
pp. 557-559
Author(s):  
K. G. Goshtasbi ◽  
M. Taheri Tavakol
Keyword(s):  
Stability Analysis ◽  
Jointed Rock ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
The Stability

Triaxial Compression Experimental Study on Post-Peak Deformation Characteristics of Rock Masses with Persistent Joints

2014 ◽  
Vol 1030-1032 ◽  
pp. 1074-1077
Author(s):  
Yang Ping ◽  
Shu Chen Li
Keyword(s):  
Triaxial Compression ◽  
Jointed Rock ◽  
Peak Strain ◽  
Deformation Characteristics ◽  
Test Results ◽  
Rock Masses ◽  
Underground Excavations ◽  
Jointed Rock Masses ◽  
Confining Pressures ◽  
The Stability

Controlling the stability of surrounding rocks in underground excavations during in-depth resource development must be confronted with post-peak deformation and failure problems of jointed rock masses. This paper describes routine triaxial compression testing on standard cylinder specimen with persistent joints in different inclinations and under different confining pressures, and analyzes deformation characteristics of rock masses with persistent joints in different inclinations and under different confining pressures. Test results show that the peak strength, residual strength, and peak strain of the jointed specimen basically increase with increasing confining pressures but decrease with increasing joint inclinations. Test results well reflect that it is incorrect to evaluate deformation characteristics of jointed rock masses with continuum mechanics and research results provide a reference for the research on the stability of surrounding rocks in underground excavations.

Application of Damage Model in Stability Analysis of ShuangjiangKou Underground Caverns

2011 ◽  
Vol 462-463 ◽  
pp. 1391-1396
Author(s):  
Lu Xiang ◽  
Wei Shen Zhu ◽  
Qing Song Ma ◽  
Kui Zhou
Keyword(s):  
Constitutive Model ◽  
Evolution Equation ◽  
Damage Evolution ◽  
Jointed Rock ◽  
Rock Masses ◽  
Damage Evolution Equation ◽  
Jointed Rock Masses ◽  
Underground Caverns ◽  
Damage Constitutive Model ◽  
The Stability

A damage constitutive model was established to evaluate the stability of jointed rock masses around the underground caverns of Shuangjiangkou Hydropower Station. In this model, a second-order damage tensor was formulated to describe the initial geometric imperfection of jointed rock masses. A failure criterion for crack coalescence and a damage evolution equation were proposed by considering the secondary cracks induced by excavations according to the fracture mechanics principles. A subprogram under the framework of FLAC-3D was developed for the damage constitutive model and the damage evolution equation. The model and program were then applied in the stability assessment for the Shuangjiangkou underground cavern group.

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