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- 저자 : Wang Zhenzhi (검색결과 2 건)
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Wang Wei,Liang Xuanyu,Niu Qinghe,Wang Qizhi,Zhuo Jinyi,Su Xuebin,Zhou Genmao,Zhao Lixin,Yuan Wei,Chang Jiangfang,Zheng Yongxiang,Pan Jienan,Wang Zhenzhi,Ji Zhongmin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8
It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method was established by the analytic hierarchy process-entropy weight method (AHP-EWM) and the fuzzy mathematics method. Finally, evaluation results were verified by the split Hopkinson Pressure Bar (SHPB) experiment and permeability test. Results show that medium sandstone, argillaceous sandstone and siltstone exhibit excellent reformability, followed by coarse sandstone and fine sandstone, while the reformability of sandy mudstone is poor and is not able to accept BEP reservoir stimulation. The permeability improvement and the distribution of damage fractures before and after the SHPB experiment confirm the correctness of evaluation results. This research provides a reformability evaluation method for the BEP of the low-permeability sandstone-type uranium deposit, which contributes to the selection of the appropriate regional and stratigraphic horizon of the BEP and the enhanced ISL of the low-permeability sandstone-type uranium deposit.
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Failure analysis for hoisting wire ropes with local accumulated broken wire damage on the surface
Ping Zhou,Gongbo Zhou,Lianfeng Han,Xiaodong Yan,Hanyu Wang,Zhenzhi He 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7
Surface broken wire (BW) damage to hoisting steel wire ropes (SWR) is unavoidable during the service process, and it continues to accumulate locally during the evolution process. The specific influence analysis of the surface damage with local cumulative BWs on the performance of the hoisting SWR is insufficient at present, which seriously affects the safety of the rope system. In this paper, a failure analysis method for the state of surface cumulative BW rope based on the integration of finite element (FE) and mechanical tension is proposed. First, a method for creating an FE model of surface BW damage is presented, and the stress-strain distribution features of damaged section under tensile load are revealed. Then, the residual mechanical strength of SWR under local cumulative BW damage is determined by performing a tensile test. Finally, based on the analysis of FE and breaking behavior, combined with the regulations, the state of the damaged SWR is comprehensively evaluated. The results show that the breaking position of the SWR under mechanical tension is the maximum stress distribution in the simulation analysis, which verifies the consistency between the simulation and the experiment; and the accumulation degree and distribution of local BW affect the residual mechanical strength of the SWR. This method explores the influence of different degrees of local BW damage on the mechanical properties of the SWR, which provides a direct basis for the non-destructive evaluation of the SWR state.
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