Geocell has the characteristics of low cost and low cost. It is suitable for railway engineering. It can replace traditional high-priced and short-lived traditional reinforced building materials. It can effectively reduce the settlement and deformation caused by train rolling on the track bed, and evenly distribute gravity. On the track of the ballast bed, extend its service life.
In the case of using crushed stone, due to the conflict between the wall surface of the geocell and the crushed stone quality inspection, a stronger degree of compaction occurs than the upper part, which improves the strength of the track subgrade as a whole and ensures the driving quality. When the bearing capacity of the road bed is low, the geocell has an outstanding effect of lowering the dynamic displacement in the straight and horizontal direction of the rail cross section. It can be seen that when the bearing capacity of the road bed is low, the use of geocells to strengthen the roadbed is more useful than the previous replacement construction methods.
The mechanisms of ground bearing capacity, settlement reduction and differential settlement of geocell gravel cushion are mainly manifested in:
（1） Improve the external stress environment
The high-strength geocell gravel cushion composite is actually a flexible raft base with greater bending, shear and compressive strength, which can effectively disperse the upper embankment load and homogenize the top surface of the soft foundation The stress distribution of the soft foundation, and then improve the external stress environment of the soft foundation, and improve the bearing capacity.
（2） Enhance straight strain resistance
The effect of the vertical reinforcement of the gravel pile is mainly manifested in that on the one hand, it bears part of the load and transmits the upper load to the deep foundation through the pile; on the other hand, it is manifested in compacting and replacing part of the soft soil, improving the soft The soil drainage conditions improve the physical and mechanical properties of the soft soil itself, so that the soil between the piles and the gravel piles can be effectively coordinated, and the foundation's bearing capacity and deformation resistance are improved.
（3）Enhance the straight support system
Geocell cushion and gravel pile composite foundation interact with each other under the load effect and work together to form a useful load horizontal dispersion and vertical support system.
