Laboratory-Based Investigation into Stress Corrosion Cracking of Cable Bolts

Abstract

Cable-bolt failures due to stress corrosion cracking (SCC) could significantly compromise the sustainability and long-term stability of underground constructions. To fully understand the SCC of cable bolts, a two-step methodology was implemented: (i) long-term cable-bolt coupon tests using mineralogical materials collected from underground mines; and (ii) accelerated full-scale cable-bolt tests using an acidified solution. In the long-term tests, a novel three-point bending coupon was designed. The effects of mineralogical materials on SCC were evaluated under the simulated underground bolting conditions through the application of “corrosion cells”. For accelerated tests, SCC resistance of different type of cable bolts was examined using the new designed tensile-loading apparatus under the periodically increasing strain-rate loading mechanism. It was identified that mineralogical materials and applied stress intensity accelerated the corrosion process of the cable bolts. The number of wires and wire surface conditions in different types of cable bolt directly affected SCC susceptibility. The cable bolts with a greater number of wires provided higher resistance to SCC. The developed experimental methodologies can be applied to study SCC in other reinforcement materials and the results can be used to design optimal support systems in different environmental and geotechnical conditions.

Simulation Study on the Dynamic Ventilation Control of Single Head Roadway in High‐Altitude Mine Based on Thermal Comfort

“…affecting the thermal comfort of the body. e PMV values at different heights of the roadway are determined using MATLAB software and the numerical simulation results of the temperature field and the wind speed field [47][48][49][50][51][52]. As shown in Figure 12, the PMV values are in the range of −0.6∼0.6, conforming to the standard value of human thermal comfort.…”

Sustainable Development Model for the Automotive Industry

“…Stakeholder involvement in the decision-making process is a useful way to explore stakeholder satisfaction and increase their interest in business regulations [31][32][33]. Few studies on stakeholders' expectations of OS have been identified by various authors.…”

“…Few studies on stakeholders' expectations of OS have been identified by various authors. It is recommended to use the stakeholder theory to achieve performance in organizational sustainability [33][34][35][36]. Stakeholder theory was first introduced in 1984 by Edward Freeman and addresses the interaction between specific groups of individuals and their interests based on the organization.…”

“…From this moment on, a series of stakeholder theories have emerged regarding the organization. In the latest studies [33][34][35][36], it is shown that stakeholders must advance this concept and take the most effective organizational measures to contribute to building a better future. Stakeholder management must have a positive responsibility to promote sustainability.…”

Simulation Research on the Effectiveness of a Multiagent Mine Safety Supervision System and Its Verification

“…e main production process is 24 hours of continuous production, three shifts per day and 8 hours per shift. At present, the working system of 5 days per week has been widely implemented, and the attendance rate of mine producers is 95% [45,46]. Although the enterprise has strengthened its safety supervision, there are still some security risks, as shown in Figure 6.…”