含水率和干密度对某铀尾砂基质吸力的影响研究
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摘要
为探究不同水土特性状态下铀尾砂基质吸力变化规律及特性,采用滤纸法在不同含水率和干密度条件下测定了3种铀尾砂的基质吸力,利用Van Genuchten (VG)模型对其水土特性曲线(SWCC)进行拟合,并构建了吸力应力特性曲线(SSCC)。研究结果表明:在高含水量阶段铀尾砂基质吸力随含水率减小而缓慢增加,当含水量小于临界值时基质吸力急剧增大。尾砂颗粒越均匀,孔隙体积越大,其残余含水率越低;在同等含水率下,随着干密度的增大,铀尾砂基质吸力有所提高,但吸力增量会因含水率增加而逐渐减小。1#和2#尾砂吸力应力随有效饱和度增长呈现出先减小后增大的规律,3#尾砂则呈现出先迅速降低后增大且增幅不断变缓的趋势,表明当1#和2#尾砂作为主要筑坝材料时,基质吸力对铀尾矿坝抗剪强度及安全性系数的影响十分有限。
In order to explore the change laws and characteristics of matric suction for the uranium tailings under different water and soil characteristic status,the matric suction of three types of uranium tailings were measure under different water contents and dry densities by using the method of filter paper. The soil-water characteristic curve( SWCC) was fitted by using the Van Genuchten( VG) model,and the suction-stress characteristic curve( SSCC) was established. The results showed that in the stage of high water content,the matric suction of uranium tailings increased slowly with the decrease of water content,and it increased sharply when the water content was less than the critical value. The more uniform the tailings particles and the larger the pore volume,the lower the residual water content. Under the same water content,the matric suction of uranium tailings increased with the increase of dry density,but the increment of suction would decrease gradually with the increase of water content. The suction stress of 1#and 2#tailings decreased first and then increased with the increase of effective saturation,while that of 3#tailings rapidly decreased first and then increased,with a continuously slowing amplification.It showed that when taking 1#and 2#tailings as the main materials of dam construction,the influence of matric suction on theshear strength and safety coefficient of uranium tailings dam was extremely limited.
In order to explore the change laws and characteristics of matric suction for the uranium tailings under different water and soil characteristic status,the matric suction of three types of uranium tailings were measure under different water contents and dry densities by using the method of filter paper. The soil-water characteristic curve( SWCC) was fitted by using the Van Genuchten( VG) model,and the suction-stress characteristic curve( SSCC) was established. The results showed that in the stage of high water content,the matric suction of uranium tailings increased slowly with the decrease of water content,and it increased sharply when the water content was less than the critical value. The more uniform the tailings particles and the larger the pore volume,the lower the residual water content. Under the same water content,the matric suction of uranium tailings increased with the increase of dry density,but the increment of suction would decrease gradually with the increase of water content. The suction stress of 1#and 2#tailings decreased first and then increased with the increase of effective saturation,while that of 3#tailings rapidly decreased first and then increased,with a continuously slowing amplification.It showed that when taking 1#and 2#tailings as the main materials of dam construction,the influence of matric suction on theshear strength and safety coefficient of uranium tailings dam was extremely limited.
引文
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[22] LU N,GODT J W,WU D T. A closed-form equation for effective stress in unsaturated soil[J]. Water Resources Research,2010,46(5):567-573.
[23] SONG Y S. Suction stress in unsaturated sand at different relative densities[J]. Engineering Geology,2014,176(12):1-10.
[24]文宝萍,胡艳青.颗粒级配对非饱和粘性土基质吸力的影响规律[J].水文地质工程地质,2008(6):50-55.WEN Baoping,HU Yanqing. Effect of particle size distribution on the metric suction of unsaturated clayey soils[J]. Hydrogeology&Engineering Geology,2008(6):50-55.
[25]谌文武,毕骏,沈云霞,等.修正Van Genuchten模型拟合干旱、半干旱地区遗址土颗分曲线的可靠性研究[J].岩土力学,2017,38(2):341-348.CHEN Wenwu,BI Jun,SHENG Yunxia,et al. Reliability research on fitting particle size distribution curves of relic soils in arid and semi-arid regions by modified Van Genuchten model[J].Rock and Soil Mechanics,2017,38(2):341-348.
[2] CHEN R,ZHANG B Z,LEI W D,et al. Response of soil suction to heavy rainfalls in a tailings dam[J]. Advanced Materials Research,2011,250:1681-1685.
[3] FREDLUND D G,RAHARDJO H. Soil Mechanics for Unsaturated Soils[M]. Wiley,1993.
[4] LU N,LIKOS W J. Unsaturated Soil Mechanics[M]. Wiley,2004.
[5] FREDLUND D G. Unsaturated Soil Mechanics in Engineering Practice[M]. Wiley,2012.
[6] BISHOP A W,BLIGHT G E. Some aspects of effective stress in saturated and partly saturated soils[J]. Géotechnique,1963,13(3):177-197.
[7] FREDLUND D G,MORGENSTERN N R,WIDGER R A. The shear strength of unsaturated soils[J]. Canadian geotechnical journal,1978,15(3):313-321.
[8] KHALILI N,KHABBAZ M H. A unique relationship forχfor the determination of the shear strength of unsaturated soils[J].Géotechnique,2002,52(1):76-77.
[9] CHANEY R,DEMARS K,VANAPALLI S,et al. The relationship between the soil-water characteristic curve and the unsaturated shear strength of a compacted glacial till[J]. Geotechnical Testing Journal,1996,19(3):259-268.
[10] THU T M,RAHARDJO H,LEONG E C. Soil-water characteristic curve and consolidation behavior for a compa[J]. Canadian Geotechnical Journal,2007,44(3):266-275.
[11] SONG Y S,HWANG W K,JUNG S J,et al. A comparative study of suction stress between sand and silt under unsaturated conditions[J]. Engineering Geology,2012(124):90-97.
[12]谭晓慧,余伟,沈梦芬,等.土-水特征曲线的实验研究及曲线拟合[J].岩土力学,2013,34(S2):51-56.TAN Xiaohui,YU Wei,SHEN Mengfen,et al. Experimental study and curve fitting of soil-water characteristic curve[J]. Rock and Soil Mechanics,2013,34(S2):51-56.
[13] TAHASILDAR J,RAO B H. Determination of swelling characteristics using soil water characteristic curve parameter[J]. Indian Geotechnical Journal,2016,46(3):319-326.
[14] KIM J,KIM Y,JEONG S,et al. Rainfall-induced landslides by deficit field matric suction in unsaturated soil slopes[J]. Environmental Earth Sciences,2017,76(23):808.
[15] LI J,YANG Y. Matric suction creep characteristics of reticulated red clay[J]. Ksce Journal of Civil Engineering,2018(5):1-6.
[16] ASTM. Standard test methods for measurement of soil potential(suction)using filter paper[C]//Philadelphia,PA:American Society for Testing and Materials,2003.
[17] SUITS L D,SHEAHAN T C,LEONG E C,et al. Factors affecting the filter paper method for total and matric suction measurements[J]. Geotechnical Testing Journal,2002,25(3):322-333.
[18] FATTAH M Y,YAHYA A Y,AHMED B A. Total and matric suction measurement of unsaturated soils in baghdad region by filter paper method[J]. Journal of Engineering, 2012, 18(5):611-620.
[19]白福青,刘斯宏,袁骄.滤纸法测定南阳中膨胀土土水特征曲线实验研究[J].岩土工程学报,2011,33(6):928-933.BAI Fuqing,LIU Sihong,YUAN Jiao. Measurement of SWCC of Nanyang expansive soil using the filter paper method[J]. Chinese Journal of Geotechnical Engineering,2011,33(6):928-933.
[20] RAHIMIA A,JOB H R,LEONG E C. Effects of soil-water characteristic curve and relative permeability equations on estimation of unsaturated permeability function[J]. Soils and Foundations,2015,55(6):1400-1411.
[21]张鹏程,汤连生,姜力群.基质吸力与含水率及干密度定量关系研究[J].岩石力学与工程学报,2013,23(S1):2792-2797.ZHANG Pengcheng,TANG Liansheng,JIANG Liqun. Research of quantitative relations of matric suction with water content and dry density[J]. Chinese Journal of Rock Mechanics and Engineering,2013,23(S1):2792-2797.
[22] LU N,GODT J W,WU D T. A closed-form equation for effective stress in unsaturated soil[J]. Water Resources Research,2010,46(5):567-573.
[23] SONG Y S. Suction stress in unsaturated sand at different relative densities[J]. Engineering Geology,2014,176(12):1-10.
[24]文宝萍,胡艳青.颗粒级配对非饱和粘性土基质吸力的影响规律[J].水文地质工程地质,2008(6):50-55.WEN Baoping,HU Yanqing. Effect of particle size distribution on the metric suction of unsaturated clayey soils[J]. Hydrogeology&Engineering Geology,2008(6):50-55.
[25]谌文武,毕骏,沈云霞,等.修正Van Genuchten模型拟合干旱、半干旱地区遗址土颗分曲线的可靠性研究[J].岩土力学,2017,38(2):341-348.CHEN Wenwu,BI Jun,SHENG Yunxia,et al. Reliability research on fitting particle size distribution curves of relic soils in arid and semi-arid regions by modified Van Genuchten model[J].Rock and Soil Mechanics,2017,38(2):341-348.