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evolution laws of strength parameters of soft rock at the post-peak considering stiffness degradation

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第4期15卷 282-290页

作者： Zeng-hui ZHAO Wei-ming WANG Xin GAO State Key Laboratory of Mining Disaster Prevention and Control Co-foundedby Shandong Province and the Ministry of Science and Technology Qingdao 266590 China College of Mining and Safety Engineering Shandong University of Science and Technology Qingdao 266590 China College of Civil Engineering and Architecture Shandong University of Science and Technology Qingdao 266590 China

To evaluate the strength attenuation law of soft rock in the western mining area of China, we established an evolution model for the strength parameters of soft mudstone at the post-peak stage by employing a tri-linear strain softening model. In the model, a stiffness degradation coefficient co and a softening modulus coefficient a were introduced to take into account the stiff- ness degradation, and the subsequent yield surfaces at post-peak stage were all assumed to meet the Molar-Coulomb yield criterion. Furthermore, attenuation laws of stiffness and strength parameters of soft mudstone were analyzed according to an engineering case. Finally, the model＇s accuracy was verified by comparison of results from numerical calculation and tri-axial compression tests. Results showed that the attenuation of the friction angle was dominated mainly by the instantaneous stress states and damage features, while the attenuation law of cohesion was also related to the plastic behavior. The degradation rates of strength param- eters decreased with increasing confining pressure and the friction angle tended towards its initial value. Residual strengths were also enhanced with increasing confming pressure. The results indicate that the evolution model can accurately describe the strain softening behavior of soft rock.

关键词： Soft rock Strain softening Stiffness degradation strength evolution evolution law

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Experimental Study on Compressive strength of Recycled Aggregate Concrete under High Temperatur

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Structural Durability & Health Monitoring 2021年第4期15卷 335-348页

作者： Mohammad Akhtar Abdulsamee Halahla Amin Almasri Department of Civil Engineering Fahad Bin Sultan UniversityTabukSaudi Arabia Department of Civil Engineering Palestine Polytechnic UniversityHebronPalestine Department of Civil Engineering Jordan University of Science and TechnologyIrbidJordan

This research aims to study the effect of elevated temperature on the compressive strength evolution of concrete made with recycled *** building concrete samples were collected from four different sites in Saudi Arabia,namely from Tabuk,Madina,Yanbu,and *** concretes were crushed and recycled into aggregates to be used to make new concrete *** samples were tested for axial compressive strength at ages 3,7,14,and 28 days at ambient *** of the same concrete mixes were subjected to the elevated temperature of 300°C and tested for compressive strength *** experimental result reveals that the recycled aggregate concrete samples have good quality at ambient and elevated temperatures and are considered fairly close to the concrete made with natural ***,recycled aggregate concrete at high temperatures showed higher strength degradation than natural aggregate concrete,but with differences that do not exceed 5%to 10%.The concrete samples made from recycled coarse aggregates also reached the design *** can be considered acceptable,considering the high variation in the concrete’s thermal response found in the literature.

关键词： Recycled coarse aggregate compressive strength strength evolution high temperature

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