The Relationship between Ultrasonic Velocities and Mechanical Damage in Sandstone under Cyclic Loading

Yang, Sen ; Liu, Shimin ; Zhang, Hongwei
Organization: International Conference on Ground Control in Mining
Pages: 10
Publication Date: Jan 1, 2017
"This laboratory study investigates the damage evolution of sandstone specimens under two types of cyclic loading conditions through monitoring and analyzing the variations of elastic moduli and ultrasonic velocities. We adopted the rigidity degradation method for evaluating the damage accumulation through the rock dynamic ultrasonic velocity measurements. Compared to the ultrasonic test, the method of rigidity degradation shows deficiencies in the detection of damage development. The cyclic loading within the elastic limit led to a stiffening trend for the loading process but a softening trend for unloading process. The method of rigidity degradation was unable to describe the damage accumulation in this situation, while P-wave velocity clearly reflected the damage development. Moreover, a simplified model is established for interpreting the behaviors of the modulus variations and ultrasonic velocity. The cyclic loading within elastic limit enhances the anisotropy of rock, which causes a denser packing pattern in the direction of axial stress. The persistent damage accumulation under the cycling with an increasing upper limit is the consequence of the tensile failure in the microstructure of sandstone. INTRODUCTION The damage accumulation due to dynamic (cyclic) loading is highly detrimental in many engineering structures, such as mine openings, petroleum and natural gas boreholes, tunnels, rock foundations, and underground chambers. The sources of cyclic or repetitive loadings can be roughly divided into two types: (1) periodic operation, including drilling, blasting, and mining; (2) random vibration, including earthquakes and traffic loads. The repetitive loading-unloading process opens and closes the micro-pores and micro-cracks within the rock, further inducing the growth of cracks. As expected, the accumulating damage becomes a potential factor to trigger the rapid and violent failures of large-scale engineering rock structure."
Full Article Download:
(1520 kb)


Additional chapters/articles from the SME-ICGCM book Proceedings of the 36th International Conference on Ground Control in Mining

Analysis of Monitored Ground Support and Rock Mass Response
Applying Robust Design to Study the Effects of Stratigraphic
Evaluation of Seismic Potential in a Longwall Mine with Mass
Damage and Permeability Evolution Mechanisms of Coal under U
Coal Bursts That Occur During Development: A Rock Mechanics
Geotechnical Challenges and Experiences of Working a Deep an
Case Study of the Barro Branco Coal Mine Pillar Burst
Numerical Modeling the Interburden Impact on Multiple-Seam C
Basic Procedures for Monitoring and Modeling Abandoned Under
Coal Rib Response during Bench Mining: A Case Study
Geotechnical Considerations for Concurrent Pillar Recovery i
Highwall Mining of Thick, Steeply Dipping Coal: A Case Study
Coal Pillar Design When Considered as an Overburden Reinforc
Analysis of Global and Local Stress Changes in a Longwall Ga
CBM Extraction Engineering Challenges and the Technology of
Numerical Analysis of the Effect of Coal Seam Characteristic
3D Modelling of Mine Backfill
Spreading of Ground Pressure Fluctuation in the Gob
Research Progress on Fully Mechanized Mining Technology of S
Fundamental Principles of an Effective Reinforcing Roof Bolt
Ten Factors about Standing Supports That Might Surprise You
Effect of Vertical Discontinuities on Roof Stability and Gro
The Relationship between Ultrasonic Velocities and Mechanica
Moisture–Induced Swelling of Illinois Mine Roof Shales: A Vi
Ground Control of Longwall Top–Coal Caving Faces within Thic
Coal Strength Variation by Lithotype for High-Volatile a Bit
Deep Cover Bleeder Entry Performance and Support Loading: A
Study on Appropriate Support System and Control Criteria for
Case Study and Design of Standing Steel Set Support for Aged
Modeling the Effect of Bolts on the Behavior of Rock Pillars
Tekcrete Fast®: Fiber-Reinforced, Rapid-Setting Sprayed Conc
A New Generation of Web-Based Applications for Mine Design
User-Friendly Finite Element Design of Main Entries, Barrier
Development and Evaluation of Corrosion Resistant Coating fo
Mechanism and Prevention Measure of Rib Spalling in 6.5 Mete
Development Process for a Greater Capacity Propsetter® Syste
Development, Trials, and Testing of a Two-Component, Rapid-S
Application of Updated Joint Detection Algorithm for the Ana
Study of the Backfill Confined Consolidation Law and Creep C
Changes in Stress and Displacement Caused by Longwall Panel
Geotechnical Monitoring of Rock Mass and Support Behaviour a
Upwards Surface Movement above Deep Coal Mines after Closure
The Use of the Area of Main Influence to Fix a Relevant Boun
High-Precision Dynamic Subsidence Prediction Model Aided by
SDPS Update: Easy Calculation of the Edge Effect Offset for