论红黏土有效孔隙比的确定方法
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摘要
红黏土有效孔隙小于实际孔隙,导致传统Darcy渗透公式计算值较实际值偏大,研究红黏土有效孔隙比的计算方法对红黏土的渗透系数计算具有重要意义。介绍了稠度指标法、起始坡降法、双电层参数法、饱和土样质量法、结合水含量法、m指数法以及自行推导的击实度法等7种有效孔隙比的计算方法,并分析了其优缺点。计算不同有效孔隙比方法的Darcy渗透系数,结合56组变水头渗透试验结果,验证了有效孔隙比计算方法在红黏土中的适用性。结果表明,应根据红黏土渗透性的大小,选择不同的有效孔隙比计算方法。
The effective porosity is smaller than the actual pore in the lateritic soil.Thus the calculation result is larger by the traditional Darcy formula than the actual value.So it is important to study the calculation method of the effective void ratio of the lateritic soil.The consistency index method,initial gradient method,double layer parameter method,saturated soil quality,combined water content method,m index method,and the compaction degree method derived in this paper were introduced.Their advantages and disadvantages were analyzed.The applicability of the modified formula of Darcy permeability coefficient based on the effective void ratio in the lateritic soil was verified based on the experimental data of 56 groups of variable head permeability.The results show that the effective void ratio should be calculated by different methods according to the permeability of the lateritic soil.
The effective porosity is smaller than the actual pore in the lateritic soil.Thus the calculation result is larger by the traditional Darcy formula than the actual value.So it is important to study the calculation method of the effective void ratio of the lateritic soil.The consistency index method,initial gradient method,double layer parameter method,saturated soil quality,combined water content method,m index method,and the compaction degree method derived in this paper were introduced.Their advantages and disadvantages were analyzed.The applicability of the modified formula of Darcy permeability coefficient based on the effective void ratio in the lateritic soil was verified based on the experimental data of 56 groups of variable head permeability.The results show that the effective void ratio should be calculated by different methods according to the permeability of the lateritic soil.
引文
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[2]杨杨,程娟,郭向阳.关于透水混凝土的孔隙率与透水系数关系的探讨[J].混凝土与水泥制品,2007(4):1-3.
[3]朱伟,徐浩青,王升位,等.Ca Cl2溶液对不同黏土基防渗墙渗透性的影响[J].岩土力学,2016,37(5):1224-1230,1236.
[4]Ren X W,Zhao Y,Deng Q L,et al.A relation of hydraulic conductivity-void ratio for soils based on Kozeny-Carman equation[J].Engineering Geology,2016,213:89-97.
[5]Koponen A,Kataja M,Timonen J.Permeability and effective porosity of porous media[J].Physical Review E,1997,56(3):3319-3325.
[6]Yokoyama T,Takeuchi S.Porosimetry of vesicular volcanic products by a water-expulsion method and the relationship of pore characteristics to permeability[J].Journal of Geophysical Research Solid Earth,2009,114(B2):1205-1222.
[7]Nishiyama N,Yokoyama T.Estimation of permeability of sedimentary rocks by applying water-expulsion porosimetry to Katz and Thompson model[J].Engineering Geology,2014,177(14):75-82.
[8]杨进良.土力学[M].3版.北京:中国水利水电出版社,2009:67-75.
[9]陈国兴,樊良本.土质学与土力学[M].北京:中国水利水电出版社,2002:65-76.
[10]李广信.高等土力学[M].北京:清华大学出版社,2004:190-195.
[11]苑莲菊,李振栓,武胜忠,等.工程渗流力学及应用[M].北京:中国建材工业出版社,2001:14-19.
[12]齐添,谢康和,胡安峰,等.萧山黏土非达西渗流性状的试验研究[J].浙江大学学报(工学版),2007,41(6):1023-1028.