新型防渗材料膨润土垫的试验研究

膨润土垫是由两层土工合成材料之间夹封膨润土,并通过针刺、粘接或缝合工艺制成的一种新型复合防渗材料.针对研发的新型膨润土垫,进行了渗透、抗干湿循环、抗冻融循环、自愈能力、摩擦特性和接缝防渗效果等试验研究.试验结果表明,膨润土垫的防渗性能与单位面积含土量以及膨润土垫内的膨润土的分布是否均匀密切相关;膨润土垫具有良好的抗冻融循环和一定的自愈能力,但抗干湿循环的能力较差;膨润土垫与中砂间的摩擦系数较大,饱和试样的摩擦系数较之于干态有所降低.

Experimental study of a new type of GCL anti-seepage material

The Geosynthetic Clay Liner(GCL) is a new kind of compound anti-seepage material which is made of two geotechnical synthetic layers with bentonite sandwiched,by means of puncturing,adhering or stitching.Related experiments were carried out for the developed GCL on its permeability,anti drying-watering cycle,anti freeze-thaw cycle,self-healing performance,friction characteristic and the anti-seepage effect of joints.Results show that the anti-seepage capability of GCL is closely related to the bentonite quantity per unit area,and to whether the bentonite is distributed evenly inside the mat,that the GCL is workable in its anti-freeze-thaw cycle and capable of certain self-healing performance,but its capability of anti-drying-watering cycle is relatively poor,that the friction coefficient between the GCL and the medium sand is larger than other materials,and that the friction coefficient of the saturation sample is a little lower than the dry one.