Study on the creep permeability of mining-cracked N2 laterite as the key aquifuge for preserving water resources in Northwestern China
Wenping Li
Qiqing Wang
Shiliang Liu
Yabing Pei
摘要：This research focused on the impact of mining on the permeability of key aquifuge (N2 laterite) that is widespread in the arid and semi-arid areas of northwestern China and is critical for preserving water resources.The impact of mining stress recovery on the permeability of cracked N2 laterite was assessed for parts of northwestern China that included the Jingle laterite and Baode laterite.The mineral compositions and swelling properties of the laterite at both locations were examined,and analytical results showed that the laterite contained abundant clay minerals.The Baode laterite exhibited higher expansibility than Jingle laterite.The triaxial creep permeability performance of laterite specimens with a prefabricated crack width of 1.0,1.5,and 2.5 mm were tested.The results indicated that strain of cracked laterite all exhibited transient creep following each level of loading,and then unstable creep and stable creep.With the increase of loading,the transient creep deformation corresponding to each level of loading decreased,the unstable creep deformation produced by identical loading gradually and incrementally increased.The nonlinear power function equation was selected to fit creep grading curves which have high precision.The cracks within the laterite gradually closed with the stress recovery,and permeability gradually recovered.During the stress recovery,the narrower cracks exhibited a smaller change in permeability.However,for narrow cracks in mining soil,permeability recovered after mining stress when permeability was closer to initial permeability,and the Baode laterite showed greater recovery than that of the Jingle laterite.
机标关键词：
资助基金：The authors express their gratitude to everyone that provided assistance for the present study.The study was jointly supported by the State Key Program of National Natural Science Foundation of China(Grant 41430643)the National Key Basic Research Program of China (973 Program)(Grant 2015CB251601)
论文发表日期：2018-01-01
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：13( 315-327 )
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