The creep of geotextile depends on external load level and ambient temperature. In this paper, the creep of geotextile is treated linearly by using the equivalent law of time and temperature, and the creep under long-term load is predicted. Geotextile is widely used in permanent engineering. It will produce large deformation under long-term load, which will make civil structure lose stability and cause many disastrous accidents. Moreover, due to large deformation of geotextile, the function of geotextile is greatly weakened. In order to make the geotextile perform its function under long-term load, its creep characteristics must be studied, and the equivalent law of time and temperature must be adopted. The reinforced life of geotextile is more than 100 years.
The application of Geomembrane in seepage control is developing rapidly in China, but there are still some technical problems in the application of geomembrane. For example, there are many kinds of geomembranes, and there are still many deficiencies in how to select geomembranes according to specific requirements and make them give full play to their physical and mechanical properties. In addition, the research on geomembrane is still a new subject. The engineering circles are not sure about its physical and chemical properties, and there are still many doubts. At the same time, the research results on the performance of geomembrane are less, especially the calculation of the leakage of geomembrane defects began in the mid-1980s, which affected the popularization and application of geomembrane. Combining theory with experiment, this paper enumerates the engineering examples of using geomembrane made of composite geotextile to prevent seepage
1.This paper introduces the varieties and characteristics of geomembrane, and lists the application examples of Geomembrane in water conservancy projects.
2.The selection methods and principles of geomembrane commonly used at present are summarized. Combined with specific projects, the physical and mechanical properties of several types of composite geomembrane are tested, and the process of selecting the type of composite geomembrane by finite element method is introduced in detail.
3.This paper introduces the related tests of interaction between geomembrane and cushion materials. Aiming at the friction characteristics between composite geomembrane and cushion materials, a self-designed test device is designed to test the friction characteristics between composite geomembrane and two cushion materials. The experimental results are compared with the existing results, and the general law of friction characteristics between composite geomembrane and cushion materials is obtained, It provides a reference for the seepage control design of geomembrane.
4.This paper lists the results of the previous non-destructive permeability test of geomembrane, and summarizes the general law of the non-destructive permeability of the geomembrane by comparing the existing test data.
5.A self-designed test device was designed to observe and study the defect leakage of composite geomembrane. The measured value of the defect leakage under different pressure head, different defect aperture and two kinds of cushion material combination is obtained. The relevant factors affecting the leakage of the composite geomembrane are analyzed.
6.Through the mathematical processing of observation data, the mathematical fitting model is established. Several methods are used to calculate the leakage of defects under various working conditions, and the observed data are verified, and the law of defect leakage of specific engineering model is obtained.
7.Combined with the engineering example of composite geomembrane seepage control, the fitting formula given in this paper is used to calculate the defect leakage through the composite geomembrane. 8. This paper makes a simple summary of the work of this paper, and puts forward the prospect of the related research of composite geomembrane.
