Creep Properties Of Composite Geomembrane

Composite geomembranes which have isolation, reinforces, protection characteristic of geotextile and excellent waterproofing performance of geomembrane, are widely applied in big-dams and flood-control works. Its creep characteristic is an important factor that affects engineering stability. Therefore, it is necessary to study the creep characteristic. In order to supply a gap in the research, creep testing experiment of Short Fiber Nonwoven Needle-punched Composite Geomembranes (a geomembrane among two layers geotextile ) was designed: using RB-0408 Creep Testing Instrument (suitable for geotextile and geomembrane) which was designed by ourselves, adopting 20%,40%, 60%, 80% limited load and lasting 6000 hours; studying the method of creep testing and data processing, as well as analyzing creep mechanism of composite geomembranes through experiment. Data processing was divided into three parts: First, analyzing testing data by empirical formula, seeking creep mechanism, and judging firstly whether the creep value in long-term constant load action affects engineering stability or not. Second, establishing two models which can simulate creep characteristic of composite geomembranes: model of six elements paralleling connection and model of six elements in series. Third, determining the formulas parameter of three kind of models with Origin software, then calculating long-term creep value. At last, forecasting long-term creep capability of composite geomembranes with valid creep model, and judging whether the creep characteristic under different loads have influence on the engineering stability and durability or not. The innovation spots in this paper. 1.designing Creep Testing Instrument.2. conducting an experiment about composite geomembrane firtly, and separately studying the situation of 20%, 40%, 60%, 80% limited load level...