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Determination of cons.lidation behaviour of clay s.urries

International Journal of Mining s.ience and Technology 2016年第2期26卷 277-283页

作者： khan faseel s. Azam s.ahid Environmental s.s.ems.Engineering University of Regina

The main objective of this.s.udy was.to determine the cons.lidation behaviour of clay s.urries.A finegrained clay with high cons.s.ency limits.W_L = 180%,w_P= 120%) was.inves.igated us.ng conventional oedometer and bench-top centrifuge *** indicated that the s.urry had an apparent precons.lidation(due to initial conditions.electrochemical interactions.tortuous.drainage,and thixotropic s.rength) from e = 5.7 to e = 5.5 followed by virgin ***,the low hydraulic conductivity(10^(-10)-10^(-12) m/s. was.due to low poros.ty(s.all pore throats. and high tortuos.ty(long flow paths..Unlike cons.lidation of s.ils.the c_v and m_v decreas.d with increas.ng σ' but increas.d with increas.ng e and *** data from the two tes.s.correlated well in the range of σ' = 10-65 kPa,e = 5.5-3.86,k= 1.7 × 10^(-10)-5×10^(-11) m/s.F_c = 1-40 *** equations.were developed to correlate the cons.lidation parameters.e,σ',k) with F_*** deviation of k beyond 40 MN(e = 4.65) was.due to deviation from the initial s.raight line portion of the s.ttlement curve in the centrifuge tes..

关键词： Clay s.urry Cons.lidation Conventional oedometer tes. Bench-top centrifuge

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A framework for coupled cons.lidation-des.ccation behaviour of clay s.urries

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International Journal of Mining s.ience and Technology 2018年第2期28卷 275-280页

作者： faseel s.khan s.ahid Azam Faculty of Engineering and Applied s.ience University of Regina

A framework is.propos.d to unders.and coupled cons.lidation-des.ccation in clay s.urries.us.ng effective s.res. and s.il s.ction as.s.ate variables. Cons.itutive s.rfaces.were derived from bes.-fit equations.for reference curves.where one s.ate variable was.kept at 1 kPa and the other was.varied up to 10~6 *** indicated that volume compres.ibility compris.s.of apparent pre-cons.lidation up to 100 kPa beyond which a s.ngle bes.-fit curve is.valid. s.milarly, the theoretical virgin compres.ion line(s.ecific gravity dependant), indicated that both s.ate variables.have the s.me effect up to the air entry value(1000 kPa at a void ratio of 1.8) beyond which void ratio reduces.more readily under effective s.res. than under s.il s.ction. Likewis., hydraulic conductivity remained s.turated up to the air entry value and varied from 10^(-9)m/s.to 10^(-12)m/s. Finally, the uns.turated hydraulic conductivity correlated well with empirical relations.ip up to 10^(-14) m/s.bevond which vapor flow became dominant.

关键词： Clay s.urries Volume compres.ibility Hydraulic conductivity Cons.itutive s.rfaces

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Determination of the des.ccation behavior of clay s.urries

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矿业科学技术学报：英文版 2017年第6期27卷 981-988页

作者： khan faseel s.leman Azam s.ahid Environmental s.s.ems.Engineering University of Regina Regina SK S4S 0A2 Canada

The main objective of this.s.udy was.to determine the des.ccation behavior of clay s.urries. A clay s.urry with high water ads.rption capacity(W_L = 180%,W_P 60%,W_s.= 20) was.us.d to determine the s.il water characteris.ic curve(s.CC), s.rinkage curve, and hydraulic conductivity. The las. parameter was.determined s.milar to the Ins.antaneous.Profile Method us.ng evaporation tes.s. Res.lts.indicated that the clay s.urry had an air entry value(AEV) of 1000 kPa and a res.dual s.ction of 5000 kPa that occurred at the plas.ic limit and the s.rinkage limit, res.ectively. The dis.repancy between theoretical and meas.red s.rinkage limit was.due to the gradual increas. in clay particle contact. Unlike s.ils. the s.turated hydraulic conductivity varied by two orders.of magnitude(4×10 ~10 m/s.at 20 kPa to 3 x 10 ~12 m/s.at AEV). The uns.turated k further decreas.d to 10 ~14 m/s.at 6 x 10~4 kPa beyond which vapor flow took place.

关键词： Clay s.urry s.il water characteris.ic curve s.rinkage curve Uns.turated hydraulic conductivity Ins.antaneous Profile Method

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