Non-parallel double-crack propagation in rock-like materials under uniaxial compression

Luo

et al. 2021

Shock and Vibration

Self Cite

In order to study the law of instability and failure in the process of loading of the south dumping site of Hesgoola Coal Mine, the FLAC 3D numerical simulation experiment and the bottom friction simulation experiment were carried out for the deformation and failure of the slope of the south dumping site, the law of instability and failure in the process of loading of south dumping site is obtained, and the relevant safety precontrol measures and suggestions are put forward. This is of great significance to ensure the safety production of the south dumping site of Hesgoola Coal Mine.

Section: Base Tiltmentioning

confidence: 80%

The Law of Instability and Failure of the Slope of Dumping Site: A Case Study in Inner Mongolia, China

Luo

et al. 2021

Shock and Vibration

Self Cite

“…The damage strength indicates that many cracks are interconnected. It is well known that crack propagation often leads to the failure of concrete (Hao et al, 2016;Gong et al, 2019;Pan et al, 2019;Hao et al, 2020). Therefore, it is necessary to study the damage strength of concrete.…”

Section: Experimental Results: Uniaxial Compressionmentioning

confidence: 99%

Mechanical Modification of Nanomaterials on Fully Saturated Concrete in Groundwater Reservoir Under Long-Term Water Immersion

et al. 2021

With the increasing number of hydraulic structures in service, many scholars have investigated the performance of saturated concrete, however, there are few studies on the influences of different contents and types of nanomaterials on the performance of fully saturated concrete. In this paper, a series of experiments on concrete with different contents of nano SiO2, nano Al2O3 and nano TiO2 are performed, such as electron mirror scanning, uniaxial compression, acoustic emission, etc., and the microstructure, mechanical properties of samples are compared and analyzed. The results show that: 1) By the addition of various kinds of nanomaterials to saturated concrete, the microstructure of saturated concrete is significantly improved, and the compactness and integrity of the slurry are improved 2) The mechanical properties of saturated concrete are significantly improved by the addition of 3 wt% nanomaterials. And the compressive strength of the saturated concrete sample containing 3 wt% nano-Al2O3 is the largest and the deformation modulus of the saturated concrete sample containing 6 wt% nano-Al2O3 is the largest. 3) Compared with dry concrete, when the concrete is saturated, the modifying effect of nanomaterials on the mechanical properties of concrete is weakened. The results of this study have important guiding significance for the study of the nano-modification and the safe operation of hydraulic structures.

Advances in Civil Engineering

“…ey found that the equivalent rock mass technology can replace the laboratory tests or in situ tests to a certain degree. Tang et al and others [40][41][42][43][44][45] simulated and investigated the mechanism of initiation, propagation, and coalescence of rock cracks by using PFC software.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Macro‐Micromechanical Properties and Failure Law of Granite under Loading and Unloading Conditions

Peng

Wang

Liu

et al. 2021

The excavation of rock significantly changes the initial stress state of rock slopes, which makes rock in complex loading and unloading conditions. However, the failure mechanisms and macro-micromechanical properties of rock under loading and unloading conditions are not very clear. This study investigates the macro-micromechanical properties and failure law of granite under loading and unloading conditions through traditional laboratory tests and particle flow simulations. Granite specimens are taken from Shuichang iron mine, and stress unloading experiments are designed based on the engineering practices. The stress-strain curves and failure modes under different confining pressures and unloading paths are obtained to analyze the granite properties from the viewpoint of the macroscopic mechanism. Moreover, numerical models are established in PFC software. The microcracks developments, failure characteristics, and energy evolutions under loading and unloading conditions are obtained and discussed. Results show that compared with the loading tests, the brittle failure characteristics of specimens under unloading tests are more obvious. When the confining pressure reduces to about 66% of the initial confining pressure, the specimen loses its load-bearing capacity and destroyed due to the lateral expansion. For loading tests, an inclined plane can be produced as the main failure surface. While for confining pressure unloading tests, there are many damage zones parallel to or intersecting with the main failure surface.