Article
Energy & Fuels
Jiadong Qiu, Kai Liu, Xibing Li, Diyuan Li, Fei Wang
Summary: Numerical simulations were conducted to investigate the dynamic behavior of deep buried tunnels subjected to blasting disturbance. The study found that the characteristics of strain energy variation differ at different locations around the tunnels, with the safety factor decreasing in the region of strain energy accumulation and increasing in the region of strain energy release. Additionally, the spacing and shape of the tunnels were found to affect the safety factor of nonadjacent tunnels.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Acoustics
Pei Zhang, Jianhua Cai, Feng Zong, Yanpeng He, Qiong Wang
Summary: Through numerical simulations, it was found that the clear distance and height difference between two tunnels affect the dynamic response characteristics, with an increase in height difference leading to higher vibration velocity in the tunnel lining. In particular, when the height difference between tunnels is 4-6 meters, there is a significant change in vibration velocity and displacement at monitoring points on the blasting side of the tunnel.
SHOCK AND VIBRATION
(2021)
Article
Engineering, Civil
Mingnan Xu, Xinping Li, Kun Xu, Tingting Liu, Yi Zhang, Ting Yang
Summary: The spatial distribution of underground tunnels has a significant impact on stress redistribution in surrounding rock masses and blast wave propagation. Field blasting tests were conducted to study the propagation of blast-induced seismic waves in underground tunnels of the Xiluodu Hydropower Station in China. The results indicate that the peak horizontal particle vibration velocity can be used as a safety criterion for underground tunnels. Numerical simulations were then used to investigate the effects of in situ stresses and spatial distributions of the tunnel group on vibration velocity distribution. The results show a significant amplification of blasting vibrations in adjacent tunnels, depending on their vertical positions during excavation.
Article
Construction & Building Technology
Xianjie Hao, Liang Yuan, Zhuowen Sun, Yinpen Zhao, Bo Ren, Defu Zhao, Junhua Xue, Xiangyang Zhang, Guofeng Yu, Qian Zhang
Summary: This article quantitatively analyzes the influence of unloading rate and unloading magnitude on the stability of surrounding rock of underground tunnel through large-scale physical model tests and numerical simulations combined with water bag filling technology to simulate high-speed unloading excavation. The results show that the impact of low-speed unloading and high-speed unloading on the surrounding rock of the tunnel is different, with low-speed unloading reducing the possibility of dynamic disasters and high-speed unloading possibly leading to more severe dynamic disasters.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Thermodynamics
Jinnan Guo, Angui Li, Chi Zhang, Jiaxing Li, Jigang Che, Jing Xiong, Xinqi Jiao
Summary: A heat transfer model was established to analyze the cooling or preheating performance of underground traffic tunnels, using the energy conservation law, boundary layer theory, and field measurement. Field tests showed that the air temperature in the tunnel fluctuated harmonically with time, with decreasing amplitude along the tunnel. The convective heat transfer coefficients were determined under different conditions, and the effective and optimal heat transfer lengths of the tunnel were calculated. This research provides theoretical support for underground traffic tunnels as natural air conditioners.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Energy & Fuels
Heping Xie, Kai Zhang, Changtai Zhou, Jianxin Wang, Qi Peng, Jun Guo, Jianbo Zhu
Summary: This paper aims to reveal the dynamic responses of the surrounding rock mass subjected to blasting disturbance and proposes prediction models for representative dynamic response parameters. The study finds that PPV, f(0), and epsilon(m) decrease with increased scaled distance, and higher rock strength leads to a stronger dynamic response. The proposed prediction models are validated and the damage zones in weathered granite stratum are proposed as well.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Construction & Building Technology
Zhen Zhang, Chuanbo Zhou, Alex Remennikov, Tingyao Wu, Shiwei Lu, Yuqing Xia
Summary: This study investigated the impact of blasting-induced vibration from subway tunnel excavation on adjacent buried structures and the safety of a civil air defense tunnel using field testing and numerical simulation. Safety criteria for blasting vibration and maximum charge per delay were established to ensure the safety and stability of the civil air defense tunnel during construction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Wenqi Guo, Wenbo Yang, Zhihao Qian, Linlin Yang, Chuan He, Shuai Qu
Summary: This study investigates the dynamic response characteristics of road-metro tunnels under train vibration loads and the effect of internal structure on the dynamic response of the tunnel linings and surrounding soils through physical model tests. The results show that the internal structure can significantly reduce the dynamic response and failure to consider it can lead to an overestimate of the dynamic response of tunnel linings and surrounding soils.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Energy & Fuels
Alexander Pomasoncco-Najarro, Claudio Trujillo-Valerio, Luis Arauzo-Gallardo, Carlos Raymundo, Grimaldo Quispe, Francisco Dominguez
Summary: The controlled blasting technique proposed in this study effectively reduces overbreaking in underground mining development galleries, leading to cost reduction and improved physical stability. The study demonstrates the importance of geomechanical studies in determining rock quality for drilling mesh design and explosive selection, resulting in minimal damage to the mining work. Simulation with software optimizes parameters and reveals significant reduction in excess excavation and support costs.
Article
Construction & Building Technology
Zhuwei Xie, Yimin Xiao, Congxin Jiang, Zhili Ren, Xueqin Li, Kecheng Yu
Summary: Recent studies have focused on the dust pollution caused by tunnel construction in metro tunnels, using a combination of numerical simulation, field measurement, and blasting ventilation model analysis. The research investigates the characteristics of dust diffusion and the impact of forced air volume flow rate and total explosive mass on ventilation time. Results show specific airflow field patterns in the personnel breathing zone and provide theoretical basis for preventing dust pollution in construction.
BUILDING AND ENVIRONMENT
(2021)
Article
Engineering, Civil
Hanlong Liu, Weixin Sun, Yanmei Zhang, Wengang Zhang, Fucheng Han, Weijia Su
Summary: Groundwater level change has a significant impact on the stability and safety of underground structures. This study investigated the effects of groundwater level changes on circular transportation tunnels and rectangular utility tunnels in a sand layer through model tests. The results demonstrated the development of concentrated structural forces during the rising and falling process of the groundwater level, indicating critical locations that require strengthening. Both tunnels exhibited a similar movement trend of settling, floating, and then settling again. It was concluded that no reduction is necessary when calculating buoyancy in sands using measured pore pressure. These findings provide important insights for future research and engineering designs.
Article
Engineering, Geological
Guopeng Lyu, Chuanbo Zhou, Nan Jiang
Summary: This study investigates the damage characteristics and distribution of grouted surrounding rock induced by tunnel blasting through ultrasonic testing and numerical simulation analysis. The results show that there is a certain pattern in the depth and degree of damage to the surrounding rock along the tunnel cross-section. Based on the findings, recommendations for reinforcement are proposed.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Engineering, Geological
Q. R. Wang, L. X. Xie, E. X. Song, F. L. Kong, J. Q. Fan, L. Y. Yu, J. M. Xu, X. Y. Shi
Summary: This study investigated the stress and deformation characteristics of underground tunnels under the combined action of explosion waves and in-situ stresses, providing necessary theoretical and technical support for the design and support of deep protective engineering.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Computer Science, Interdisciplinary Applications
Mingming He, Mingchen Ding, Zhuoya Yuan, Jinrui Zhao, Bo Luo, Xudong Ma
Summary: Frequent dynamic disturbances, such as explosions, vibrations, and earthquakes, can lead to the risk of rock burst disasters in deep-buried tunnels. This study used PFC software to simulate rock bursts triggered by blasting stress waves and investigated their effects on deep-buried tunnels in jointed rock masses. The results showed that higher ground stress and joint angles increase the risk and intensity of rock bursts, causing significant damage to surrounding rocks and making existing tunnels more vulnerable to impact.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Construction & Building Technology
Hui Wang, Hongyuan Huai, Zhichao Xu, Shichang Shang, Hang Zhou, Xueyang Xing
Summary: This paper studies a new type of foam-fiber concrete, which improves the mechanical properties and energy absorption capacity of traditional foam concrete by adding fiber materials. It is of great significance for buffering and energy absorption in soft rock support.
CONSTRUCTION AND BUILDING MATERIALS
(2023)