A 3D synthetic rock mass numerical method for characterizations of rock mass and excavation damage zone near tunnels

2020 ◽  
Vol 79 (10) ◽  
pp. 5615-5629
Author(s):  
Yabing Zhang ◽  
Xinrui Liu ◽  
Tianhong Yang ◽  
Peng Jia ◽  
Xin Liu ◽  
...  
Keyword(s):  
Rock Mass ◽  
Numerical Method ◽  
Damage Zone ◽  
Excavation Damage Zone ◽  
Synthetic Rock Mass ◽  
Synthetic Rock ◽  
Excavation Damage

Influence Research of Underground Caverns Blasting Excavation on Excavation Damage Zone of Adjacent Cavern

2013 ◽  
Vol 838-841 ◽  
pp. 901-906 ◽  
Author(s):  
Peng Cheng Xu ◽  
Qian Dong ◽  
Xin Ping Li ◽  
Yi Luo
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Kinematic Hardening ◽  
Damage Zone ◽  
Side Wall ◽  
Measured Data ◽  
Excavation Damage Zone ◽  
Underground Caverns ◽  
Blasting Excavation ◽  
Excavation Damage

The influence of the single cavern blasting excavation in underground caverns on the stability of surrounding rock of adjacent caverns can not be ignored.In–situ blasting vibration test and dynamic finite element analysis were used to study the laws of blasting seismic wave propagation, two different material constitutive models were adopted, compared with measured data,to select material constitutive model which was more in line with the dynamic characteristics of rock mass in underground caverns.On this basis, the influence mechanism for blast–induced EDZ(Excavation Damage Zone) of the adjacent cavern is studied through the method of numerical simulation. The results show that the numerical simulation resulted by adopting kinematic hardening model were more close to measured data than adopting ideal elastic–plastic model; the middle part of adjacent tunnel side wall facing blasting had the largest damaged rock mass range; both sides of the arch and the foundation rock of the adjacent cavern emerged damaged rock mass area, and the area of adjacent tunnel side wall facing blasting was larger than side wall not facing blasting.

scholarly journals CLAY-BASED GROUTING FOR EXCAVATION DAMAGE ZONE AROUND THE TUNNEL

2006 ◽  
Vol 62 (1) ◽  
pp. 175-190
Author(s):  
Kazuhiko MASUMOTO ◽  
Tomoo FUJITA ◽  
Yutaka SUGITA
Keyword(s):  
Damage Zone ◽  
Excavation Damage Zone ◽  
Excavation Damage

Hydromechanical response of a bedded argillaceous rock formation to excavation and water injection

2015 ◽  
Vol 52 (1) ◽  
pp. 1-17 ◽  
Author(s):  
A.D. Le ◽  
T.S. Nguyen
Keyword(s):  
Rock Mass ◽  
Pore Pressure ◽  
Damage Zone ◽  
Water Injection ◽  
Constitutive Relationship ◽  
Opalinus Clay ◽  
Anisotropic Plastic ◽  
Mont Terri ◽  
Excavation Damage

Opalinus clay is a candidate host formation for the geological disposal of nuclear wastes in Switzerland. The understanding of its long-term mechanical (M) and hydraulic (H) behaviour is an essential requirement for the assessment of its performance as a barrier against radionuclide transport. To study the HM response of Opalinus clay, a microtunnel, 13 m in length and 1 m in diameter, was excavated in that formation at the Mont Terri Underground Research Facility. The rock mass was equipped with sensors to measure the deformation and pore pressure in the rock mass during and after the excavation. A mathematical model that couples the equations of flow and mechanical equilibrium was developed to simulate the HM response of the rock mass. An anisotropic plastic constitutive relationship, based on a microstructure tensor approach, was incorporated in the model. Creep was also considered, as well as the anisotropy of permeability. It is shown that the model satisfactorily predicts the shape and extent of the excavation damage zone (EDZ), deformation, and pore pressure in the rock mass. It is also shown that anisotropy and creep play an important role in the HM response of the rock mass to excavation. The model was further used to simulate water injection tests performed at the test section in the microtunnel. The results show that EDZ, due to its high permeability, is a preferential groundwater flow path along the microtunnel.

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