Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine

Wu, Hai; Jia, Qian; Wang, Weijun; Zhong, Nong; Zhao, Yuemin

doi:10.3390/su132313280

Cited by 44 publications

(24 citation statements)

References 4 publications

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“…Rock is a material ubiquitous in mines, expressways, tunnels, dams, slopes, and other rock mass engineering [ 1 , 2 , 3 ], as shown in Figure 1 . The construction and operation of engineering are closely related to the physical and mechanical properties of rocks [ 4 , 5 , 6 ], whereas rock is essentially a kind of heterogeneous medium, which is a complex mineral aggregate formed under physical and chemical actions after a long geological process [ 7 , 8 ]. It is mainly composed of a variety of mineral grains and cements and contains a large number of defects, such as joints, micro-cracks, pores, holes, and faults [ 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

et al. 2023

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The rock or rock mass in engineering often contains joints, fractures, voids, and other defects, which are the root cause of local or overall failure. In response to most of the current constitutive models that fail to simulate the nonlinear fracture compaction deformation in the whole process of rock failure, especially brittle rocks, a piecewise constitutive model was proposed to represent the global constitutive relation of rocks in this study, which was composed of the fracture compaction empirical model and the damage statistical constitutive model. The fracture empirical compaction model was determined by fitting the expressions of fracture closure curves of various rocks, while the rock damage evolution equation was derived underpinned by the fracture growth. According to the effective stress concept and strain equivalence hypothesis, the rock damage constitutive model was deduced. The model parameters of the fracture compaction empirical model and damage statistical constitutive model were all calculated by the geometrical characteristics of the global axial stress–strain curve to guarantee that the models are continuous and smooth at the curve intersection, which is also simple and ready to program. Finally, the uniaxial compression test data and the triaxial compression test data of different rocks in previous studies were employed to validate the models, and the determination coefficient was used to measure the accuracy. The results showed great consistency between the model curves and test data, especially in the pre-peak stage.

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Section: Introductionmentioning

confidence: 99%

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

et al. 2023

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“…Research on the deformation and strength characteristics of joints aims to provide a basis for the evaluation and utilization of rock mass stability [ 7 , 8 ]. In view of this, many scholars have systematically carried out a large number of studies on the shear strength and deformation characteristics of joints from theoretical derivations [ 9 , 10 ], laboratory tests [ 11 , 12 , 13 , 14 , 15 ] and numerical simulations [ 16 , 17 , 18 ]. The research content includes the effect of size, roughness, freeze–thaw action, infilled material, bolt mode, etc.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

et al. 2023

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As a composite material, the stability of rock mass is usually controlled by a joint. During the process of excavation, the normal stress of the joint decreases continuously, and then the shear strength of the joint decreases, which may eventually lead to the instability and failure of rock mass. Previous studies have mainly focused on the shear behavior of joints under constant normal stress, but have rarely considered the unloading of normal stress. In this paper, a direct shear test of joints with different roughness was carried out, in which the shear stress remained unchanged while the normal stress decreased. The strength characteristics of joints were explored, and the deformation and acoustic emission-counting characteristics of joints were analyzed by digital image correlation (DIC) techniques and acoustic emission (AE). A new method for predicting the instability of joints under normal unloading was proposed based on the evolution law of normal deformation energy (Un), tangential deformation energy (Us) and total deformation energy (U0). The results show the following: (1) The unloading amount of normal stress was enlarged for greater initial normal stress and roughness, while it decreased with an increase in initial shear stress. (2) AE events reached their maximum when the normal stress was equal to the failure normal stress, and the b-value fluctuated more frequently in stable development periods under normal unloading conditions. (3) U0 would change with the loading and unloading of stress, and this may be used to predict the unloading instability of rock mass using the abrupt change of U0.

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“…Engineering rock mass contains a large number of joints and fractures with different scales, the occurrence of these defects greatly affects the integrity of rock mass and reduces the rock strength [ 1 , 2 , 3 ]. The properties of joint interface determine the mechanical responses of rock mass to varying degrees and then affect the safety and stability [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Apparent Deterioration Law and Shear Failure Mode of Rock–Mortar Interface Based on Topography-Sensing Technology

et al. 2023

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As an advanced spatial technology, topography-sensing technology is comprehensive, macroscopic, and intuitive. It shows unique advantages for rock structure interpretation and has important guiding significance for the research of the shear performances of rock–mortar interface under cyclic load in rock mass engineering. In this paper, cyclic shearing tests combined with the shear surface topography-sensing technology are employed to investigate the evolution characteristics of the interface morphology and the strength deterioration of the rock–mortar interface. Primarily, mortar and three types of rocks are used to prepare different rock–mortar interfaces, which are then applied to cyclic shear loading under two constant normal stresses. Subsequently, the shear strength degradation and dilatancy characteristics of rock–mortar interfaces with varying shear times are discussed. In addition, on the basis of the non-contact three-dimensional topography-sensing technology, the apparent three-dimensional point–cloud coordinate information of rock–mortar interface before and after each shear loading is obtained, and the apparent three-dimensional topography parameters of rock–mortar interface are calculated, according to which the influences of normal stress and lithology on the topography of interface subjected to cyclic shearing loading are analyzed.

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Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine

Cited by 44 publications

References 4 publications

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

Fracture Closure Empirical Model and Theoretical Damage Model of Rock under Compression

Experimental Study on Shear Behavior of Rock Composite Material under Normal Unloading Conditions

Apparent Deterioration Law and Shear Failure Mode of Rock–Mortar Interface Based on Topography-Sensing Technology

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