Brittleness has a significant influence on rock failure under compression; however, the mechanism is rarely comprehensively discussed. This study numerically investigates brittleness effect microcracking behavior of crystalline using grain-based model implemented into two-dimensional particle flow code, with focus discussion how affects mechanism. The simulated mode changes from tension to shear decreasing brittleness, which consistent previous laboratory test results. As gradually decreases...

Abstract Rockburst forecasting plays a crucial role in prevention and control of rockburst disaster. To improve the accuracy prediction at data structure algorithm levels, Yeo–Johnson transform, K-means SMOTE oversampling, optimal feature dimension determination are used to optimize structure. At optimization level, ensemble stacking is performed based on optimization. First, solve problem many outliers imbalance distribution data, transform k-means respectively problems. Then, six original...

Abstract Shear failure often occurs in engineering rock mass (such as inclined pillar) gently strata. Prediction and characterization the orientation of shear plane is foundation reinforcement. In this paper, sandstone samples are used to perform uniaxial tests obtain basic mechanical parameters. Then, by employing numerical method, combined compression–shear loading were carried out for specimens varied from 0° 25° at an interval 5°, dip effect on plane. The results show that changes with...

Spalling failure is a typical phenomenon after excavation and unloading of deep, hard brittle rock mass, which seriously threatens the safe construction deep roadways (tunnels) other projects. From engineering viewpoint, it essential to accurately evaluate range depth surrounding spalling failure. perspective laboratory site, strength formation mechanism were statistically summarized analyzed. Under uniaxial low confining pressure conditions, when load reached damage stress, cracks in...

Due to its potential pozzolanic activity, granulated copper slag (GCS) has been proven act as a supplementary cementitious material (SCM) after thermochemical modification with CaO. This method reduces cement consumption and CO2 emissions; however, the additional energy environmental properties are also not negligible. paper aims evaluate economics of thermochemically modified GCS CaO through melting temperature, grindability, heavy metal leaching characteristics. The X-ray fluorescence...

Liquid carbon dioxide blasting technology has a wide range of applications and is characterized by sound fracturing effects, low vibration hazards, high safety. In order to investigate the characteristics mechanism CO2 phase change rock breaking, liquid tests on rock-like specimens were carried out in this paper. The results show that 130 MPa threshold value at which system moves from dynamic tensile stress damage pressure damage. When pressures 100 70 are used, lumpiness ratio fragments...

Relevancy transformation operators (RET operators) have been widely used in fuzzy systems modelling and the construction of weighted aggregation functions. Several methods RET based on different functions such as t-norm, t-conorm copula, proposed. In this paper, attention is paid to expression operators, which an important feature from application point view. Polynomial are introduced those form polynomial two variables. A complete characterisation degree less than 4 presented.

Real-world datasets often contain missing or corrupted values. Completing multidimensional tensor-structured data with entries is essential for numerous applications. Smoothness-constrained low-rank factorization models have shown superior performance reduced computational costs. While effective at capturing global and long-range correlations, these struggle to reproduce short-scale, high-frequency variations in the data. In this paper, we introduce \Generalized Least Squares Kernelized...

In the paper, construction of relevancy transformation operators by means S−nullnorm and T−nullnorm is studied. By comparing with nullnorm case, we find that there no N−pseudo duality about itself for constructed operators.

An inclined pillar is a typical support structure under compression and shear loads for underground mining. The load caused by the inclination of ore-body affects bearing capacity pillar. At present, there no systematic investigation on influence stress state evolution Additionally, still lack effective evaluation in presence additional load. In this research, theoretical analysis method used to solve these problems. First, compressive components were calculated tributary area method,...