Estimation of the Rock Load in Non-squeezing Ground Condition Using the Post Failure Properties of Rock Mass

2015 ◽  
Vol 33 (4) ◽  
pp. 1115-1128 ◽  
Author(s):  
Mohsen Soleiman Dehkordi ◽  
H. A. Lazemi ◽  
K. Shahriar ◽  
Masoud Soleiman Dehkordi
Keyword(s):  
Rock Mass ◽  
Squeezing Ground ◽  
Failure Properties ◽  
Rock Load ◽  
Ground Condition

Application of the strain energy to estimate the rock load in squeezing ground condition of Eamzade Hashem tunnel in Iran

2011 ◽  
Vol 6 (4) ◽  
pp. 1241-1248 ◽  
Author(s):  
M. Soleiman Dehkordi ◽  
K. Shahriar ◽  
P. Moarefvand ◽  
M. Gharouninik
Keyword(s):  
Strain Energy ◽  
Squeezing Ground ◽  
Rock Load ◽  
Ground Condition

scholarly journals Study on failure law of rock mass and slope stability by open-pit combined mining

2021 ◽  
Vol 248 ◽  
pp. 03013
Author(s):  
Feng Shaojie ◽  
Gao Chen ◽  
Liu Wenbo
Keyword(s):  
Field Theory ◽  
Rock Mass ◽  
Slope Stability ◽  
Simulation Method ◽  
Geological Structure ◽  
Open Pit ◽  
Copper Mining ◽  
Failure Properties ◽  
Mining Methods ◽  
Reinforcement Measures

With the continuous downward mining, more and more attention has been paid to the problem of slope stability under open-pit combined mining. Taking Zijinshan gold and copper mining as an example, the failure properties of overlying rock mass and slope stability under open-pit combined mining under different mining methods are studied by numerical simulation method, and the failure law of overlying rock mass is proposed. Combined with the geological structure distribution of 5-5 section and the influence of different mining stages, the slope stability is evaluated by slip field theory. Relevant reinforcement measures are proposed.

scholarly journals Evaluating the Impact of Blast-Induced Damage on the Rock Load Supported by Liner in Construction of a Deep Shaft: A Case Study of Ventilation Shaft of Micangshan Road Tunnel Project

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Yong Fang ◽  
Zhigang Yao ◽  
Gabriel Walton ◽  
Jian Zhou ◽  
Wanghao Xu ◽  
...  
Keyword(s):  
Rock Mass ◽  
Damage Zone ◽  
Road Tunnel ◽  
Step Method ◽  
Ventilation Shaft ◽  
Blast Damage ◽  
Shear Loads ◽  
Rock Load ◽  
Rock Mass Condition ◽  
The Impact

The rock load acting on the lining of an underground excavation is influenced by multiple factors, including rock type, rock mass condition, depth, and construction method. This study focuses on quantifying the magnitude and distribution of the radial loads on the lining of a deep shaft constructed in hard rock by the so-called short-step method. The blasting-induced damage zone (BDZ) around the shaft was characterized using ultrasonic testing and incorporated into the convergence-confinement method (CCM) and 3D numerical analyses to assess the impact of BDZ on rock loading against the liner. The results show that excavation blasting of shafts is an important controlling factor for the degradation of the rock mass, while the orientation and magnitude of the principal stress had a minimal influence on the distribution of blast-induced damage. The analysis shows that increasing the depth of blast damage in the walls can increase the loads acting on the lining, and the shear loads acting on the liner could be significant for shafts sunk by the short-step method in an area with anisotropic in situ stresses.

scholarly journals Estimation of Rock Load of Multi-Arch Tunnel with Cracks Using Stress Variable Method

2020 ◽  
Vol 10 (9) ◽  
pp. 3285 ◽  
Author(s):  
Jae Kook Lee ◽  
Hankyu Yoo ◽  
Hoki Ban ◽  
Won-Jun Park
Keyword(s):  
Rock Mass ◽  
Factor Of Safety ◽  
Deformation Modulus ◽  
Variable Method ◽  
Design Stage ◽  
Concrete Lining ◽  
Accurate Estimation ◽  
Stress Variable ◽  
Tunnel Design ◽  
Rock Load

In multi-arch tunnels, the increased rock load on the concrete lining of the main tunnel and side walls due to the excavation of adjacent tunnels is critical and must be considered in the design stage. Therefore, this study estimates the rock load of a multi-arch tunnel using two-dimensional numerical analysis, considering rock mass classifications, overburden, and construction steps. The rock load is estimated using two criteria: the factor of safety and stress variable. The rock load is underestimated when the factor of safety is applied to rock mass class III. However, the stress variable method reveals a reasonable rock load as overburden increases. Particularly, the rock load is estimated to be equal to the overburden in shallow tunnels and approximately 0.7 times the tunnel width in deep tunnels. Additionally, the crack-induced rock load is computed using back analysis at the excavation completion stage of adjacent tunnels, yielding the relation between the rock load height and the deformation modulus of the rock mass. Therefore, an accurate estimation of the rock load of multi-arch tunnels emphasizes the importance of a more economical and realistic design and must be addressed in the process of performance-based tunnel design.

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