Although the slippage effect has been extensively studied,most of the previous studies focused on the impact of the slippage effect on apparent permeability within a low pore pressure range,resulting in the inability of matching the evolution of permeability in the remaining pressure range.In this paper,a new apparent permeability model that reveals the evolution of permeability under the combined action of effective stress and slippage in the full pore pressure range was proposed.In this model,both intrinsic permeability and slippage coefficient are stress dependent.Three experimental tests with pore pressure lower than 2 MPa and a test with pore pressure at about 10 MPa using cores from the same origin under constant confining stress and constant effective stress are conducted.By comparing experimental data and another apparent permeability model,we proved the fidelity of our newly developed model.Furthermore,the contribution factor of the slippage effect Rslip is used to determine the low pore pressure limit with significant slippage effect.Our results show that both narrow initial pore size and high effec-tive stress increase the critical pore pressure.Finally,the evolutions of the slippage coefficient and the intrinsic permeability under different boundary conditions were analyzed.

Zhiyong Xiao;Changsheng Wang;Gang Wang;Yujing Jiang;Junhong Yu

Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,China;College of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China;State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao 266590,China

矿业科学技术学报（英文版）

[1]Zhiyong Xiao;Changsheng Wang;Gang Wang;Yujing Jiang;Junhong Yu-.An improved apparent permeability model considering full pore pressure range,variable intrinsic permeability and slippage coefficient)[J].矿业科学技术学报（英文版）,2022(06):1233-1244

Rslip

An,improved,apparent,permeability,model,considering,full,pore,pressure,range,variable,intrinsic,slippage,coefficient,Although,has,been,extensively,studied,most,previous,studies,focused,impact,within,resulting,inability,matching,remaining,In,this,paper,that,reveals,under,combined,action,effective,stress,was,proposed,both,dependent,Three,experimental,tests,lower,than,about,using,cores,from,same,origin,constant,confining,conducted,By,comparing,data,another,fidelity,our,newly,developed,Furthermore,contribution,determine,limit,significant,Our,results,show,narrow,initial,size,high,increase,critical,Finally,evolutions,different,boundary,conditions,were,analyzed

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