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针对利用土的变水头(常水头)渗透仪测定水泥土渗透系数存在密封止水效果差、仪器操作复杂等缺陷,难以满足水泥土试样周边止水以及试验所需较大渗透坡降的要求。本文提出采用常规三轴仪进行水泥土室内渗透试验的新方法,并结合水泥土固结不排水剪试验结果对孔隙水压力产生主要原因进行分析。结果表明:该方法能够较好地测定水泥土渗透系数,并对其它复合固化土材料的渗透系数测试具有一定的借鉴意义;另外,水泥水化物对孔隙有填充和封闭作用,使得试样内存在封闭气体,从而影响饱和度,导致水泥土的孔隙水压力系数B远小于1。
For the use of variable head (constant head) permeability tester soil cement penetration coefficient of the sealing effect of sealing water there is poor, the instrument is complicated and other defects, it is difficult to meet the cement soil samples around the stoppage of water and the test required greater permeability gradient . In this paper, we propose a new method to test the permeability of cemented soil by conventional triaxial apparatus, and analyze the main causes of pore water pressure by combining with the test results of undrained cement-soil consolidation. The results show that this method can be used to determine the permeability coefficient of cement soil well, and is of certain reference value for the permeability coefficient test of other composite soil materials. In addition, the cement hydrate can fill and close the pores, Closure of gas, thus affecting the degree of saturation, resulting in cement pore water pressure coefficient B is much smaller than 1.