Multi-spring Edge-to-Edge Contact Model for Discontinuous Deformation Analysis and Its Application to the Tensile Failure Behavior of Rock Joints

Zhang, Yingbin; Zhao, John X.; Chen, Guangqi; Yu, Peng; Yang, Tianzu

doi:10.1007/s00603-019-01973-8

Cited by 17 publications

(2 citation statements)

References 36 publications

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“…Through numerical simulation and theoretical derivation, Cheng et al 28 and Ding et al 29 described the rock breaking principle of double-wedge cutting blasting with hole-outer delay and subsequently verified the engineering applicability of this cutting pattern in deep-hole blasting driving. Moreover, Zhang et al 30 added several straight holes detonated simultaneously with shallow cutting holes into a double wedge cutting pattern, which could cause preliminary damage to the bottom rock during hard rock cutting blasting. However, these improved wedge cutting patterns using the hole-outer delay have achieved only limited success in increasing the deep-hole cutting efficiency and have led to additional problems such as complex hole arrangements and difficult drilling operations.…”

Section: Introductionmentioning

confidence: 99%

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Cheng,

Wang,

Wang

et al. 2024

Sci Rep

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To increase the efficiency of deep-hole blasting driving in mine rock tunnels, an innovative pattern of wedge cutting blasting with hole-inner delay was proposed. First, the blasting mechanisms of conventional and innovative wedge cutting patterns were theoretically investigated. The results showed that the resistance from large upper rock blocks and the clamping action from the surrounding rock were the major challenges of conventional cutting methods. For the innovative cutting pattern, under the conversion of the spatial distribution and release sequence of blasting energy, the first blasting of the upper charge can strengthen the breaking of the upper rock mass and create a new free surface, which provides favorable conditions for the delayed blasting of the bottom charge. Second, finite element models of two cutting patterns were established and solved, and the simulation results visually revealed the propagation of a stress wave. Critically, the stress strength in the upper cavity increased by 66–83% under the action of the upper charge, which was conducive to the breaking of the upper rock mass and the generation of a new free surface. Therefore, the rock mass in the bottom cavity can be readily broken and discharged. Ultimately, field applications were executed in a rock tunnel. Compared with a conventional cutting pattern, the proposed innovative cutting pattern can prominently increase the cycle advance and hole utilization and greatly reduce the unit consumption of explosives and detonators. This research confirms the usability of the innovative wedge cutting pattern with hole-inner delay in deep-hole blasting driving of rock tunnels.

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Section: Introductionmentioning

confidence: 99%

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Cheng,

Wang,

Wang

et al. 2024

Sci Rep

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“…Based on the distinct lattice spring model, Lian et al (2018) analyzed flexural toppling failure by incorporating the gravity increase method. Zhang et al (2020) tried to take the discontinuous deformation analysis (DDA) to simulate the tensile failure of blocks in toppling mode, but this method needs to add contacts at the failure surface in advance. As a commercial software commonly used in geotechnical engineering, the universal distinct element code (UDEC) was also utilized by a lot of researchers.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Flexural Toppling Failure in Rock Slopes Using Discrete Element Method

et al. 2021

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Flexural toppling failure is a common failure mode of natural and artificial rock slopes, which has caused serious damage to human life and property. In this work, an advanced numerical method called the Universal Distinct Element Code (UDEC) was used to study the mechanism of flexural toppling failure. In total, more than twenty slope models were built and analyzed. Two new parameters (displacement discontinuity and transition coefficient of failure surface) were introduced to present a further understanding of flexural toppling. The results show the failure zone of rock slopes subjected to flexural toppling includes two parts: the first-order instability part (FOIP) and the independent toppling zone (ITZ). The FOIP can be further divided into two subzones: the sliding zone (SZ) and the superimposed toppling zone (STZ). The occurrence of surface deformation discontinuities is the precursor to flexural toppling failure. The first displacement discontinuity occurs on the boundary between the FOIP and the ITZ. The angle, spacing, and angle of the joints, the angle of the slope has a significant influence on the stability of anti-dip bedding rock slopes. However, they do not affect the deformation and failure pattern of the slope.

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Discrete Element Methods with Special Focus on DDA

Chen

2023

Springer Tracts in Civil Engineering

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Multi-spring Edge-to-Edge Contact Model for Discontinuous Deformation Analysis and Its Application to the Tensile Failure Behavior of Rock Joints

Cited by 17 publications

References 36 publications

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Research on the mechanism and application of wedge cutting blasting with hole-inner delay

Analysis of Flexural Toppling Failure in Rock Slopes Using Discrete Element Method

Discrete Element Methods with Special Focus on DDA

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