Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

Jia, Chengzao; Li, Yong; Lian, Mingyuan; Zhou, Xiaoyong

doi:10.3390/en10040563

Cited by 20 publications

(7 citation statements)

References 31 publications

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“…Liu et al (2017) provided a new semi-deterministic Block theory method (NSDBT) based on digital photogrammetry techniques and applied it to the Changhe dam that is located in the Sichuan province, southwest China. Jia et al (2017) used discontinuity spatial distribution for underground geotechnical structures. They provided the extended key block theory in three dimensions which attempted to identify and classify the key-blocks.…”

Section: Block Theorymentioning

confidence: 99%

Discontinuous rock slope stability analysis by limit equilibrium approaches – a review

Azarafza

Akgün

Ghazifard

et al. 2021

International Journal of Digital Earth

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Slope stability is one of the most important topics of engineering geology with a background of more than 300 years. So far, various stability assessment techniques have been developed which include a range of simple evaluations, planar failure, limit state criteria, limit equilibrium analysis, numerical methods, hybrid and high-order approaches which are implemented in two-dimensional (2D) and three-dimensional (3D) space. In the meantime, limit equilibrium methods due to their simplicity, short analysis time, coupled with probabilistic and statistics functions to estimate the safety factor (F.S), probable slip surface, application on different failure mechanisms, and varied geological conditions has been received special attention from researchers. The presented paper provides a review to limit equilibrium methods used for discontinuous rock slope stability analyses with different failure mechanisms of natural and cut slopes. The article attempted to provide a systematic review for rock slope stability analysis outlook based on limit equilibrium approaches.

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Section: Block Theorymentioning

confidence: 99%

Discontinuous rock slope stability analysis by limit equilibrium approaches – a review

Azarafza

Akgün

Ghazifard

et al. 2021

International Journal of Digital Earth

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show abstract

“…The joints are mainly composed of tectonic and weathered fractures. The existence of joints has a significant influence on the development of the caving and the characteristics of surface rock movement [24,[38][39][40], which usually leads to a large number of unstable rock blocks in the formation. The detailed survey of the structural plane of the roof rock mass was carried out by manual in underground roadways, the main survey parameters included occurrence, inclination, dips, and spacing of joints, and the measured parameters were then analyzed using DIPS software [4].…”

Section: Determination Of Mechanical Parameters In Numericalmentioning

confidence: 99%

Study on the Rock Mass Caving and Surface Subsidence Mechanism Based on an In Situ Geological Investigation and Numerical Analysis

Ren

Zhang

Cao

et al. 2018

Mathematical Problems in Engineering

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To deeply understand the mechanism of the rock mass caving and associated surface subsidence during sublevel caving mining, the Xiaowanggou iron mine was selected as an engineering project case study. The study area was analyzed by means of an in situ geological investigation and numerical simulation. First, a borehole television (BHTV) system and a GPS monitoring system were used to monitor the caving process of the roof rock mass and the development of the surface subsidence; the monitoring time was thirteen months. Then, a numerical simulation was used to analyze the damage evolution of the rock mass. Research shows the following: (1) in situ geological monitoring results indicate that the caving process of the roof rock mass presents intermittent characteristics, where slow caving and sudden caving are conducted alternatively and the arched-caving trend is more pronounced with continuous mining. The surface subsidence, horizontal displacement, and horizontal deformation of the hanging wall are higher than that of the footwall, and the subsidence center gradually deflects to the hanging wall in the late stage of the +45m sublevel mining. (2) Numerical simulation results indicate that the extension and penetration of the shear and tensile cracks along the joints and intact rock bridges are the main factors causing the rock mass caving and the existence of the stress arch and its evolution process is the fundamental reason for the intermittent caving of the rock mass. The rapid development of damage to the hanging wall (the damage angle reduced) is the main cause of the deflection of the subsidence center affected by joints and the mining size. (3) In the future of mining, large-scale subsidence will occur on the surface of the hanging wall.

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“…On the other hand, the deformation and failure of jointed tunnels are studied. For example, the influence of blasting on the failure of tunnel surrounding rock [7], the damage mechanics, and the elastic-plastic mechanics considering joints are introduced to solve the surrounding rock [8,9], and the stability of tunnel surrounding rock is studied by the block theory and numerical simulation method [10,11]. Jia et al and Wang et al [12,13] studied the failure mechanical characteristics of coal and rock mass by an acoustic emission test and analyzed the internal failure process of coal and rock mass by an acoustic emission signal.…”

Section: Introductionmentioning

confidence: 99%

Study on Influence of Joint Distribution on Surrounding Rock Failure of an Underground Tunnel

2021

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Due to geological structure and artificial disturbance, a large number of joints and fissures are formed in the surrounding rock of an underground tunnel. In order to study the influence of joints on the failure characteristics of tunnels, three test schemes with different joint lengths, joint spacing, and joint positions are designed. The results show that the bearing capacity of the tunnel decreases with the increase in the joint length. With the increase in joint spacing, the bearing capacity of the tunnel decreases first and then increases. The crack propagation law of the three test schemes has experienced four stages: no crack, crack initiation, crack rapid development, and crack gradual reduction. The location of joints has the greatest influence on the failure mode of the tunnel. The crack is most likely to appear at the top of the tunnel and expand along the joint, mainly because it is easy to form tensile stress at the top of the tunnel and compressive stress concentration at the joint tip. Therefore, when excavating the tunnel in the underground space, the influence of joints on the tunnel should be considered. Analyzing the relationship between the tunnel and joints has important practical guiding significance for the control of the surrounding rock of the tunnel. Finally, the failure results of the indoor physical model and numerical model are compared and analyzed. They are in good agreement, which also reflects the rationality of numerical simulation.

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Jointed Surrounding Rock Mass Stability Analysis on an Underground Cavern in a Hydropower Station Based on the Extended Key Block Theory

Cited by 20 publications

References 31 publications

Discontinuous rock slope stability analysis by limit equilibrium approaches – a review

Discontinuous rock slope stability analysis by limit equilibrium approaches – a review

Study on the Rock Mass Caving and Surface Subsidence Mechanism Based on an In Situ Geological Investigation and Numerical Analysis

Study on Influence of Joint Distribution on Surrounding Rock Failure of an Underground Tunnel

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