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Experimental investigation on shear strength deterioration at the interface between different rock types under cyclic loading

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3063-3079页

作者： Qiong Wu Zhiqi Liu Huiming Tang Liangqing Wang Xiaoxue Huo Zhen Cui Shiyu Li Bo Zhang Zhiwei Lin Faculty of Engineering China University of GeosciencesWuhan430074China guangxi fangchenggang beitou environmental protection water co. Ltd.Fangchenggang538021China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

The shear strength deterioration of bedding planes between different rock types induced by cyclic loading is vital to reasonably evaluate the stability of soft and hard interbedded bedding rock slopes under earthquake;however,rare work has been devoted to this subject due to lack of *** this study,experimental investigations on shear strength weakening of disco.tinuities with different joint wall material(DDJM)under cyclic loading were co.ducted by taking the interface between siltstone and mudstone in the Shaba slope of Yunnan Province,China as research objects.A total of 99 pairs of similar material samples of DDJM(81 pairs)and disco.tinuities with identical joint wall material(DIJM)(18 pairs)were fabricated by inserting plates,engraved with typical surface morphology obtained by performing three-dimensional laser scanning on natural DDJMs sampled from field,into mold *** shear tests were co.ducted on these samples to study their shear strength changes with the cyclic number co.sidering the effects of normal stress,joint surface morphology,shear displacement amplitude and shear *** results indicate that the shear stress *** displacement curves under each shear cycle and the peak shear strength *** number curves of the studied DDJMs are between those of DIJMs with siltstone and mudstone,while closer to those of DIJMs with *** peak shear strengths of DDJMs exhibit an initial rapid decline followed by a gradual decrease with the cyclic number and the decrease rate varies from 6%to 55.9%for samples with varied surface morphology under different testing *** normal stress,joint surface morphology,shear displacement amplitude and shear rate co.lectively influence the shear strength deterioration of DDJM under cyclic shear loading,with the degree of influence being greater for larger normal stress,rougher surface morphology,larger shear displacement amplitude and faster shear rate.

关键词： Disco.tinuities with different joint wall material(DDJM) Disco.tinuities with identical joint wall material(DIJM) Cyclic shear test Shear strength deterioration Joint surface morphology Shear displacement amplitude Shear rate Normal stress

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Recent advances in the reco.ery of transition metals from spent hydrodesulfurization catalysts

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Tungsten 2021年第3期3卷 305-328页

作者： Jian-Zhang Wang Hao Du Afolabi Olayiwola Biao Liu Feng Gao Mei-Li Jia Ming-Hua Wang Ming-Lei Gao Xin-Dong Wang Shao-Na Wang School of Metallurgy Northeastern UniversityShenyang 110819China CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Chengde V and Ti New Material co. Ltd.HBIS Group Co.Ltd.Shijiazhuang 050023China

Hydrodesulfurization(HDS)catalysts are widely used in petrochemical industries,playing a crucial role in desulfurization process to get high-quality *** generation of Al-based spent HDS catalyst is estimated to be 1.2×105 tons per year around the *** spent HDS catalysts have been regarded as an important seco.dary resource due to their abundant output,co.siderable metal value,and regeneration potential;however,if improperly handled,it would severely pollute the environment due to high co.tent of heavy ***,the reco.ery of valuable metals from spent HDS catalysts is of great importance from both resource utilization and environmental protection points of *** this work,recent advances in the spent HDS catalyst treatment technologies have been reviewed,focusing on the reco.ery of valuable transition metals and environmental ***,typical co.mercial processes have been discussed,providing in-depth information for peer researchers to facilitate their future research work in designing more effective and environmentally friendly recycling processes.

关键词： Spent hydrodesulfurization catalyst Recycling Hydrometallurgical and pyrometallurgical processes Valuable metals

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