Article
Engineering, Geological
Junhong Huang, Xiaoqing Wei, Yi Luo, Hangli Gong, Tingting Liu, Xinping Li
Summary: This study investigated the deformation and failure of surrounding rock mass triggered by sudden changes of rock quality encountered in a tunnel excavation project, focusing on the geological disasters caused by fracture zones. The findings from a field case analysis of the Daliang Tunnel in China revealed the deformation profiles of the surrounding rock mass at different distances from the fracture zone. The relationship between the deformation of the surrounding rock mass in the fracture zone and the materials, length of advanced support, and excavation advance rate was also explored. The study emphasized the significance of controlling rock mass deformation in fracture zones.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Computer Science, Interdisciplinary Applications
Qihao Sun, Fengshan Ma, Jie Guo, Haijun Zhao, Guang Li, Shuaiqi Liu, Xueliang Duan
Summary: The study focuses on the stress path during underground excavation and its impact on surrounding rock masses. A realistic stress path model was developed to capture the actual behavior of rock during excavation. The research findings indicate that the evolution of the excavation damage zone played a crucial role in support failure.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Mechanics
Nannan Zhao, Zhushan Shao, Bo Yuan, Xinyuan Chen, Kui Wu
Summary: Existing analytical models of shallow lined tunnels neglect the coupled effects of slope angle and seepage, resulting in an overestimation of tunnel stability. In this study, a new analytical approach is proposed to estimate the effective stress and deformation in shallow lined tunnels considering the corresponding influence factors. The proposed solution is achieved by using coordinate transformation, complex function, and conformal mapping methods.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Engineering, Geological
M. Williams, M. Ziegler, Stephan Schennen, S. Loew
Summary: The text presents the results of seismic experiments conducted in two excavation damaged zones (EDZs) in Mont Terri Underground Rock Laboratory. The findings provide valuable insights into the integrity of the rock mass surrounding the excavation and its implications for mid-term safety assessments.
ENGINEERING GEOLOGY
(2022)
Article
Engineering, Civil
Zeyu Li, Hongwei Huang, Mingliang Zhou, Dongming Zhang
Summary: This study uses the material point method (MPM) to simulate the failure responses of a rock tunnel face during excavation through the fault-fracture zone (FFZ). A numerical study was conducted to compare a physical model test and validate the feasibility of using the MPM in simulating tunnel face failure. The simulation results suggest that factors such as cohesion, friction angle, tunnel cover depth, and FFZ thickness significantly influence failure responses.
Article
Engineering, Marine
Xiang Liu, Dongchi Wang, Yu Zhang, Annan Jiang, Qian Fang, Rui Zhang
Summary: For grouted and lined subsea tunnels, fluid flow follows non-Darcy's law and analytical solutions are provided for the dynamic water levels using complex variable functions and the Hansbo non-Darcy seepage model. The solutions can be degenerated into traditional methods following Darcy's law and are validated using numerical simulation, experimental and in-situ data. The results show that the method is suitable and universal, with parametric analyses demonstrating the significant impact of non-linear seepage parameters and dynamic water levels on water inflow and water head.
Article
Chemistry, Analytical
Xiaorong Wan, Chuan Li, Zhengang Zhao, Dacheng Zhang, Yingna Li, Jiahong Zhang
Summary: A Fiber Bragg Grating stress sensor was developed in this study to measure stress variations in rock, with applications in safety monitoring and stability prediction in underground coal mines. The sensor compensates for environmental temperature disturbances and has shown sensitivity to stress changes in the Excavation Damaged Zone. Monitoring results indicate that the sensor is effective in measuring stress amplitudes and creep times during blasting, providing important data for mine safety.
Article
Engineering, Mechanical
Longlong Chen, Yaqiong Wang, Zhi-Feng Wang, Feifei Fan, Yong Liu
Summary: This paper analyzes the collapse characteristics and mechanism of a tunnel in Wenzhou in a fault fracture zone during rainfall. The study uses the failure theory of surrounding rock, three-dimensional discrete element numerical simulation, and in-situ deformation monitoring. The continuous erosion and expansion of rock fissures caused by water seepage are identified as the main reason for the reduction of surrounding rock stability. Treatment measures such as grouting and pipe-roofing are adopted and the reinforcement effect is evaluated through monitoring.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Engineering, Geological
Milad Zaheri, Masoud Ranjbarnia, Meisam Goudarzy
Summary: This paper presents a theoretical solution to predict long-term tunnel convergence and long-term induced lining pressure in soft rock masses with a damaged zone. The rheological behavior of rock mass and the altered zone is simulated using a viscoelastic model. The effects of various parameters on the induced lining pressures and tunnel convergence are evaluated. The results show that the support installation time and the radius of the altered zone have remarkable effects on the output results.
ROCK MECHANICS AND ROCK ENGINEERING
(2022)
Article
Engineering, Geological
Huatao Zhao, Ming Tao, Xibing Li, Hitoshi Mikada, Shibo Xu
Summary: The research utilizes the Hoek Brown criteria to calculate the distribution of excavation damaged zone around the cavity at different burial depths, and investigates the dynamic responses of the excavation-damaged cavity under dynamic disturbance using the SEM method. Influencing factors such as the shapes of EDZ, the incident direction of dynamic disturbance, and the dynamic source frequency are identified.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Construction & Building Technology
Ozguer Satici, Tamer Topal
Summary: The study investigates the relation between damage zone thickness and tunnel wall convergence for horseshoe-shaped highway tunnels using empirical methods. By gathering data through in-situ convergence measurements and numerical models, estimates for damage zone thickness and convergence were made, showing agreement with real measurements.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Changbai Wang, Jimin Liu, Hua Cheng, Haibing Cai
Summary: This paper investigates the excavation-induced disturbance range and mechanism of adjacent pipeline jacking group on surrounding soils. Through field tests and evaluations, it is found that the disturbance intensity is greatly affected by the parallel distance and buried depth.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Yanru Zhao, Xiangsheng Chen, Biao Hu, Pinghao Wang, Wanshuang Li
Summary: In this study, an effective anti-floating measure combining shaft excavation with the frictional pile slab (FPS) was proposed for long and collinear foundation pits above existing tunnels. The convergence of the shield segments was measured over 800 days, and numerical simulation was conducted to analyze the effect of shaft excavation width and frictional pile dimensions on tunnel uplift. A multi-objective optimization procedure was used to optimize the anti-floating design considering safety and economy. Compared to the high-pressure jet-grouting pile method, the FPS method proved more effective in controlling tunnel heave. The presented data and methods can provide useful guidance for similar scenarios.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Xingzhou Chen, Quan Zhang, Xinchao Ding, Lili Chen, Wei Du, Hai Jiang, Sheng Gong
Summary: The creep associated with unloading surrounding rock during deep tunnel excavation has a significant impact on tunnel stability, and high seepage pressure exacerbates the strength attenuation and structural deterioration of the rock. This paper conducts a triaxial unloading seepage creep test considering the effects of excavation disturbance and seepage pressure on a deeply buried granite tunnel. The study analyzes the mechanisms of unloading and seepage pressure leading to sample failure and constructs a fractional creep damage constitutive model. The research findings provide reference for stability analysis of surrounding rock in high-stress and high-seepage-pressure environments.
Article
Engineering, Geological
Quan Zhang, Zhigang Tao, Chun Yang, Shan Guo, Manchao He, Chongyuan Zhang, Huiya Niu, Chao Wang, Shen Wang
Summary: An innovative non-explosive technology called Instantaneous Expansion (IE) was developed for tunneling. Experimental and numerical results showed that IE achieved outstanding directional rock breaking and caused the least damage to the surrounding rock. The tunnel cross-section created by IE was flat and smooth. Compared to conventional blasting (CB) and shaped charge blasting (SCB), IE reduced over/under-excavation area and excavation-induced damage zone, contributing to improved long-term stability of the roadway.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Civil
Mohammad Reza Zareifard
Summary: This paper presents an analytical-numerical solution of the ground response curve for a tunnel considering gravitational loading, using specific yield criterion and plastic potential function for the ground medium, and introducing flexible and inflexible lining theories. The derived differential equations are solved using finite difference approximations, and illustrative examples demonstrate the effects of gravity loading on tunnel convergence. Results show that gravity loads may affect tunnel convergence, especially in wide plastic regions.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Energy & Fuels
Mahmood Shakiba, Ehsan Khamehchi, Ahmad Fahimifar, Bahram Dabir
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2020)
Article
Geosciences, Multidisciplinary
Milad Abolfazli, Ahmad Fahimifar
ARABIAN JOURNAL OF GEOSCIENCES
(2020)
Article
Construction & Building Technology
Milad Abolfazli, Ahmad Fahimifar
CONSTRUCTION AND BUILDING MATERIALS
(2020)
Article
Engineering, Multidisciplinary
Mohammad Reza Zareifard, Mohammad Reza Shekari
Summary: Rock excavation using drill and blast method is commonly used worldwide, leading to deterioration of surrounding rock mass and underestimation of tunnel stability. The blast-induced damage zone and seepage beneath the groundwater table have significant effects on tunnel convergence and stress distribution in the rock mass.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Construction & Building Technology
Shayan Sheikhi Narani, Pouria Zare, Mohsen Abbaspour, Ahmad Fahimifar, Sumi Siddiqua, Seyed Majdeddin Mir Mohammad Hosseini
Summary: This paper investigates the cyclic behavior of Rammed Earth (RE) elements under strain controlled cyclic loads. Results indicate that cement stabilization and fiber reinforcement can enhance cyclic strength, with CSFR specimens performing the best among the tested soil mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Geological
Mohammad Hossein Taherynia, Seyed Mahmoud Fatemi Aghda, Ahmad Fahimifar, Mohammadreza Koopialipoor
Summary: This paper investigates the compression drive mechanism on oil reservoirs, exploring the effects of key elastic parameters on stress paths and compaction. The ratio of Young's modulus between reservoir rocks and surrounding rocks plays a significant role in reservoir compression and oil recovery.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Seyedeh Hosna Talebian, Mohammad Enayati Najafabadi, Ahmad Fahimifar
Summary: This paper focuses on using a comprehensive diagnostics workflow that combines coupled hydro-mechanical modeling with production data-driven diagnostics to optimize the stimulation candidate selection process. The coupled formation damage index (CFDI) is used to capture the effect of production-induced stress changes on near-wellbore permeability over time, helping identify the top stimulation candidates. Probabilistic type curves and decline curve analysis of candidate wells versus reservoir unit are also utilized to complement stimulation and production enhancement candidate selection.
SN APPLIED SCIENCES
(2021)
Article
Engineering, Geological
Alireza Seghateh Mojtahedi, Meysam Imani, Ahmad Fahimifar
Summary: This paper discusses the issue of face stability in tunnel stability analysis, focusing on deep and shallow tunnels excavated in rock masses. The author presents upper-bound solutions for determining face pressure, taking into consideration different collapse mechanisms and the Hoek-Brown failure criterion. Results show that face pressure decreases with increasing certain rock mass parameters, and charts are provided to specify the range of applicability for deep and shallow tunnels. Additionally, it is demonstrated that reducing the Hoek-Brown parameters of the rock mass can lead to the spreading of collapse mechanisms from the tunnel face to the ground surface.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Marine
Mohammad Reza Shekari, Seyed Mehrab Amiri, Mohammad Reza Zareifard
Summary: A submerged floating tunnel (SFT) is proposed as an alternative to conventional bridges and tunnels for crossing deep waterways. Limited research has been done to analyze the importance of seaquake effects on SFTs. This paper numerically simulates the dynamic response of an SFT system under bidirectional earthquake actions and confirms the significance of input seismic excitation characteristics.
Article
Engineering, Multidisciplinary
Soleiman Ghoohestani, Mohammad Reza Shekari, Mohammad Reza Zareifard, Seyyed Mehrab Amiri
Summary: This study analyzes two base isolation systems and compares their seismic applicability with a liquid-filled elevated container. The effects of various parameters on the efficiency of the seismic bilinear hysteretic members are examined through finite element analysis. The results suggest that the earthquake response spectrum plays a crucial role in the performance of the elevated containers.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Review
Mechanics
Seyedeh Hosna Talebian, Ahmad Fahimifar, Amin Heidari
Summary: The development of complex carbonates presents challenges such as uncertain fracture distribution, heterogeneous fluid behavior, unstable asphaltene content, high contents of H2S and CO2, and high salinity formation brine. These challenges limit the understanding of reservoir behavior and data availability for further analysis.
JOURNAL OF COMPUTATIONAL APPLIED MECHANICS
(2021)
Article
Engineering, Geological
Mohammad Hossein Taherynia, Mohammadreza Koopialipoor, Abbas Azizzadeh, Ahmad Fahimifar, Soheil Ghyasvand
Summary: Small variations in shear strength parameters can significantly affect the safety factor of a rock slope. A new back analysis approach for estimating rock mass strength is proposed, which involves deriving a functional relationship for m(b) and s constants and establishing a relationship based on the Geological Strength Index (GSI). By plotting these relationships on a graph, a unique value for m(b) and s can be determined, increasing the accuracy of parameter estimation.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Engineering, Geological
Meysam Imani, Ahmad Fahimifar
Summary: The study utilizes the upper bound method of limit analysis to investigate the effects of joints in rock masses on vertical and inclined bearing capacity, deriving analytical expressions for this relationship. The results indicate that increasing joint friction angle and orientation angle lead to a decrease in inclination coefficients.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2021)
Article
Engineering, Geological
Mohammad Reza Zareifard
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2020)
