静载、振动和电渗作用下尾黏土固结的试验研究

Experimental study on tailing clay consolidation under action of static loading,vibration and electro-osmosis

为研究静载、振动和电渗三种因素作用下,尾黏土的固结排水效果,利用改装后的空心圆柱扭剪仪进行试验研究,得到了三种因素的顺次和联合作用下的固结排水量。结果表明:静载很小状态排水量与荷载施加顺序无关,静载较大状态顺次作用最佳施加顺序为静载-振动-电渗;振动在静载压力较小或固结早期效果较好,电渗在静载压力较大或固结后期效果较好;振动排水的影响因素主要为振幅和频率;电渗排水的影响因素主要为电压和试件导电性;联合作用下频率取接近固体固有频率,电渗取最大电压时排水效果最好;最佳频率振动与电渗具有耦合作用;相同因素水平下联合作用效果优于顺次作用。

In order to study the consolidation drainage of tailing clay under action of static loading,vibration and electro-osmosis,an experimental study is performed based on the converted hollow cylinder apparatus.The order of all factors and the consolidation drainage under joint action of three factors are obtained.The results show that the drainage is independent of the loading order under small static loading,while the best order of loading is static loading-vibration-electro-osmosis in sequence under large static loading.The vibration works well at smaller static loading pressure or early consolidation,while the electro-osmosis works well at bigger static loading pressure or later consolidation.The main influence factors of vibration drainage are the amplitude and the frequency.The main influence factors of electro-osmosis drainage are the voltage and the electroconductivity of specimen.It will get the best drainage effect under joint action of three factors when the frequency is close to the natural frequency of the solid part and the voltage of electro-osmosis has the maximum value.The coupling effect between the optimal frequency vibration and the electro-osmosis can be obtained.The effect of joint action is better than that of action in sequence under the same level of all factors.