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以模拟矿山渗滤液作为渗透溶液,使用柔性壁渗透仪,在不同有效应力条件下测定土工合成黏土衬垫(geosynthetic clay liner,GCL)的渗透系数。试验结果表明:矿山渗滤液作用下GCL渗透系数升高的幅度与其所受有效应力的大小紧密相关;当有效应力为24 kPa时,矿山渗滤液的渗透使GCL的渗透系数升高至1.52810-′m/s,比控制样(自来水渗透)的渗透系数高340倍,不能满足《一般工业固体废物贮存、处置场污染控制规范》对防渗层渗透系数的要求(k≤1.0910-′m/s)。而当有效应力为93、162、231和438 kPa时,矿山渗滤液的持续作用使GCL的渗透系数只分别升高了26、21、14和10倍,且全部满足规范要求。研究结果表明,在对矿山废弃物处置场中GCL的防渗性能进行评估时,必须考虑GCL试样在场地中的受力状态。
The permeability coefficient of geosynthetic clay liner (GCL) was measured under different effective stresses by using the simulated wall leachate as infiltration solution and flexible wall infiltrometer. The results show that the increase of permeability coefficient of GCL is closely related to the effective stress of GCL. When the effective stress is 24 kPa, the permeability of mine leachate increases the permeability coefficient of GCL to 1.52810- m / s, which is 340 times higher than that of the control sample (water infiltration), which can not meet the requirement of permeability coefficient of impermeable layer of “General Industrial Solid Waste Storage and Treatment Site Pollution Control Code” (k≤1.0910-mm / s ). When the effective stress was 93, 162, 231 and 438 kPa, the continuous action of mine leachate increased the permeability coefficient of GCL by only 26, 21, 14 and 10 times, respectively, and all met the requirements of the code. The results show that in assessing the impermeability of GCL in the mine waste disposal site, the stress state of the GCL sample in the site must be considered.