防渗土料物理化学性质及分散性试验研究

为了解青海拟建的班多土石坝防渗心墙土料的分散性原因,通过碎块、双比重计、针孔、孔隙水可溶盐及交换性钠百分比等五种方法的土料分散性试验和化学试验,对土料进行了分散性鉴定.试验和分析结果表明,土样中的粘土矿物主要以伊利石为主,蒙脱石含量较少;伊利土中含有大量的钠离子,使得伊利土象钠蒙脱土一样具有强分散性;pH值较高,使得土壤颗粒之间的净势能表现为斥力,这也促使土样土样产生分散性.土样中大量钠离子的存在及其pH值较高,使土样产生分散性的最主要的原因.

Study on dispersibility by physical and chemical properties analysis and dispersive test for soil core wall

In order to know dispersive mechanism of soil,the dispensability of soil samples obtained from the clay core wall of building Banduo earth-rock dam in Qinghai province are studied by the chemical properties of soil analysis and the tests for identification of dispersive clay soils which included double-hydrometer test,pinhole test,crumb test,test to determine salt content of pore water and percentage of exchangeable sodium and seepage distortion tests.The results of experiments and analysis shown that the clay mineral is mainly gerundive,montmorillonoid is little,but a great quantity of sodium-ion in gerundive soil and larger pH make the soil as well as montmorillonoid which is intense dispensability,These are two keys for the soil to disperse.