Non-destructive, in-situ, fast identification of adverse geology in tunnels based on anomalies analysis of element content

Xu, Zhenhao; Liu, Fumin; Lin, Peng; Shao, Ruiqi; Shi, Xuesong

doi:10.1016/j.tust.2021.104146

Cited by 24 publications

(3 citation statements)

References 16 publications

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“…Adverse geology poses a threat to underground engineering construction and may lead to water inflow hazards 1–3. Grouting is an important method for water inflow treatment and stratum reinforcement in underground engineering.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Pan

Zhang

et al. 2023

Num Anal Meth Geomechanics

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In order to investigate the slurry flow behavior, our newly proposed numerical method is applied to simulate the fracture grouting with flowing water condition. First, by numerical validation and experiment comparison, the advantages of this method in computation efficiency and accuracy are shown. Second, the initial velocity of water and slurry properties at different levels are selected as the influencing factors, the water reduction effect, grouting pressure, and slurry deposition behavior in different cases are investigated, and the variation characteristics of flow field and slurry outflow are analyzed. The simulation results show that within the range of slurry properties and flow velocity given in this paper, cement slurry cannot seal the water inflow. Instead, quick setting slurry with different material ratios can effectively seal the fracture. The sealing efficiency is more sensitive to the initial flow rate than the slurry property. When the groundwater flow rate is low, the effect of slurry proportion on sealing can be ignored. Meanwhile, slurry properties have more influence on the final grouting pressure. There is an obvious surge in grouting pressure after sealing, which can be used as a criterion for fracture sealing.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Pan

Zhang

et al. 2023

Num Anal Meth Geomechanics

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“…With the rapid development of science and technology and economy, the human demand for the exploitation of underground space and underground resources is rapidly increasing (Ge and Sun, 2018; Gottron and Henk, 2021; Liu et al., 2021; Wang et al., 2019; Xu et al., 2021). The development potential of underground space resources is huge, and human activities such as underground rock excavation and geothermal development are becoming more and more frequent, and the creeping deformation effect of deep rock body under the action of thermal-mechanical coupling is very significant.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on creep characteristics and fractional creep damage constitutive model of limestone under thermal-mechanical action

Jiang

Zhang

et al. 2022

International Journal of Damage Mechanics

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To study influence of thermal-mechanical action on creep for the geothermal wellbore, Dalian limestone was taken as the research object, and triaxial creep tests were carried out on samples under different temperatures and the effects of different temperatures on the creep deformation, creep rate and long-term strength of limestone are discussed. The test results show that the creep process of limestone under thermal-mechanical action shows three distinct phases. As the temperature increases, the creep time and long-term strength gradually decrease. The macroscopic failure modes of limestone under different temperatures are shear failure and the fracture surface is more obvious. Meanwhile, based on the principle of statistical damage and fractional calculus, the damage body under high temperature is proposed, and a fractional creep damage model that can characterize the triaxial creep mechanical behavior of limestone under different temperatures is constructed. The reasonableness of the model is proved by comparing. The parameters analysis shows that the fractional order δ mainly affects the creep rate, which is expressed in the stable and accelerated phases. The aging damage parameter λ is related to the time coordinate scale. The research results in this paper can provide a certain guiding significance for the long-term stability evaluation of the surrounding rock of the geothermal wellbore.

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Risk assessment of TBM jamming based on Bayesian networks

Lin

Xiong

et al. 2021

Bull Eng Geol Environ

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Non-destructive, in-situ, fast identification of adverse geology in tunnels based on anomalies analysis of element content

Cited by 24 publications

References 16 publications

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Numerical investigation of slurry property effect on grouting and blocking of flowing water in rock fractures

Study on creep characteristics and fractional creep damage constitutive model of limestone under thermal-mechanical action

Risk assessment of TBM jamming based on Bayesian networks

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