Application of geomembranes in different environments
In engineering construction, composite geomembrane often meets the condition of building embankment or embankment on soft foundation.Because the lateral soil pressure in the filling soil makes the foundation surface accept the horizontal shear stress, resulting in the displacement of the embankment body to both sides, which is very simple to form the instability of the embankment body.The use of geotextile fabric reinforced building materials foundation is generally laid at the bottom of the embankment single layer or multi-layer high modulus geotextile or geotextile grid, used to constrain the lateral displacement of the subsoil.Such reinforcement is often intended for the following purposes:(1) improve the stability of the dike against sliding; (2) add the filling height of dike; (3) reduce the construction period of the filling of a lot of sinking, save earthwork; (4) make the dike sinking tends to be uniform, to prevent the dike surface cracking. However, it should be noted that reinforcement is difficult to reduce long-term consolidation and secondary consolidation settlement.
The whole foundation is extremely soft and full of clay, silt, or even peat soil. At this time, except for the two ends of the embankment, the foundation deformation is basically plane strain, so the direction of high strength of reinforced building materials should be straight with the axis of the embankment.
There are some vulnerable areas in the foundation,for example, a buried lens of soft soil in an ancient channel, a pond, or a stratum, make reinforced building materials cross at this moment flimsily area, make stress dispersive, the direction that asks building materials intensity to be higher likely is dispersed on a few directions, need handles by actual state.Of course, there is a situation, is the first requirement of reinforced building materials to play a barrier effect, that is, to ensure the integrity of the fill, prevent part of the subsidence, lost fill, the construction materials satisfying this requirement are usually filament geotextiles with high elongation rather than geotextiles with high strength and modulus.