In contemporary subgrade construction, geocells are usually used to effectively prevent uneven settlement of subgrades. The reinforcement of geocells can effectively reduce the vertical stress and shear force in the soil and enhance the stability of the subgrade. The actual engineering effect shows that: geocell for subgrade Uneven settlement is currently very effective, low-cost, construction method and its simple solution.
Uneven settlement of roadbed is one of the common diseases of highways, which can cause large cracks and dislocations on the road surface. In the past, the more commonly used method was to excavate steps, but the effect was not satisfactory. In recent years, the effect of using geocells for uneven settlement of subgrade has been more prominent.
The principle of geocell for subgrade Uneven settlement:
(1) After laying and unfolding the geocell, it forms a diamond or square structure similar to the cell, which becomes a composite body that is conducive to filling. Such a composite three-dimensional structure allows the filler to be easily stabilized at any angle, thereby forming the continuity and integrity of the entire plane.
(2) Extremely strong tensile performance is produced by the friction of the soil interface. The tensile performance of the geocell sheet is exerted by using its own tensile properties to limit the side expansion of the filler, so that the use of its own tensile resistance can effectively prevent the side expansion of the filler, thereby protecting the roadbed .
(3) For the cell body, the friction coefficient of the rib is the internal friction coefficient of the filler itself, so it can provide much greater adhesion strength than the flat reinforcement.
Since the geocell provides greater lateral restraint on the filler, the sidewall of the cell generates an upward frictional support force on the filler, thereby forming a composite body with greater bending and tensile stiffness and shear strength. The body can isolate the transfer of stress and displacement, thereby flexibly transitioning and coordinating the settlement of the top surface of the semi-filled and semi-excavated subgrade; it has a net bag effect on the local load, which makes the load distribution more uniform; the reinforcement effect of the geocell is reduced The vertical stress and shear stress in the soil are improved, and the stability of the roadbed is enhanced, so as to achieve the purpose of eliminating uneven settlement of the roadbed.