The excavation damaged zone (EDZ) can be defined as a rock zone where the rock properties and conditions have been changed due to the processes related to an excavation. This zone affects the behavior of rock mass surrounding the construction that reduces the stability and safety factor and increase probability of failure of the structure. In this paper, a methodology was examined for computing...

in advance longwall mining, the safety of mine network, production rate, and consequently, economic conditions of a mine are dependent on the stability conditions of gate roadways. the gate roadway stability is a function of two important factors: 1) characteristics of the excavation damaged zone (edz) above the gate roadway and 2) loading effect due to the caving zone (cz) above the longwall w...

Characterization of Excavation Damaged Zone (EDZ) around an underground excavation is a major research topic for deep geological disposal of medium to high level radioactive waste. Rock fracturing due to excavation and thermal loading and its resultant rock mass permeability change in the EDZ are important aspects in the EDZ characterisation. A new function to predict rock mass permeability cha...

An excavation damage zone (EDZ) can be defined as a rock zone where the rock properties and conditions have been changed due to the processes related to an excavation. This zone affects the behavior of rock mass surrounding the construction that reduces the stability and safety factor and increase probability of failure of the structure. This paper presents an approach to build a model for the ...

This paper aims to estimate the distribution and magnitude of the excavation damaged zone (EDZ) caused by the tunnel boring machine (TBM) through dynamic three-dimensional large deformation finite element analysis. Coupled EulerianLagrangian (CEL) analysis was used to consider the large deformation behavior during TBM excavation. The analysis model was verified based on estimations reported in ...

The development of an excavation damaged zone (EDZ) around an underground excavation can change the physical, mechanical and hydraulic behaviors of the rock mass near an underground space. This might result in endangering safety, achievement of costs and excavation planed. This paper presents an approach to build a prediction model for the assessment of EDZ, based upon rock mass characteristics...

Xiaowan Hydropower station’s dam located in south west of China is the second highest arch dam in the world (h = 292 m), its foundation is based on brittle rocks of biotite granite gneiss and amphibolites plagioclase gneiss. A largescale excavation around the foundation of the dam was conducted, near to 90 meters horizontal depth excavation and 130 meters vertical depth excavation, so the found...

Abstract In order to understand the mechanical behavior of a stope and analyse stress conditions surrounding rocks after ventilation shaft excavation abutment stresses top coal mining layout. situ uniaxial monitoring tests were performed field pressure evolution. Furthermore, variation concentration factor was studied using Tongxin Mine 8309 face TongMei Group, China, as case study. A loading m...

Tunnelling in bedded shale rocks induces damage around the excavation. Consequently, rock mass excavation damaged zone (EDZ) shows different thermo-hydro-mechanical (THM) properties from intact rock. In turn, material close to tunnel wall is affected by seasonal fluctuations temperature and relative humidity (RH) variations associated with ventilation, impacting total suction saturation state o...

As the market for renewable integration is expected to grow, there an increasing interest in excavated rock caverns as a solution overcome limitations of conventional CAES that use solution-mined salt caverns. One major challenges ensuring air tightness and pressure resistance performance lined-rock (LRCs). To address this, we reviewed research on several key aspects, including tightness, groun...