Research And Development Of Geocell And Its Application Technology Based On Emergency Needs

Gansu Province is located in an area where geological disasters occur frequently.Sudden disasters seriously endanger road safety and have a severe impact on social stability,economic development,and consolidation of border defense along the transportation route.The use of scientific and effective rapid rush-through technology for post-disaster highways to ensure emergency transportation of highways is the basis of rescue and rescue,and the key to damage reduction and disaster reduction is also a powerful guarantee for the harmonious development of society.This requires the use of new materials and technologies in addition to the rational design of the road structure,so that roads for emergency rescue and disaster relief can be quickly built after sudden disasters occur.Geocell as a new type of road construction material,due to its unique three-dimensional structure and material resistance to abrasion,free expansion and contraction,convenient transportation,diversity of filler choices and strong lateral restraint on the filler can be used Post-disaster road repairs and paving of easy access roads.However,when simple pavement is paved,the influence of geocell type and filler type on the pavement bearing capacity is uncertain,and when the geocell is used as a reinforcement material on the upper part of the pavement structure,its nodes are prone to peeling and damage.In view of the above problems,based on a large number of domestic and foreign scholars,this article improves the grid node and designs a large-scale simulation test box to conduct largescale model tests on two heights,three welding distances and the improved grid.Two types of fillers were selected for the model test of emergency rescue conditions,four different sets of underlaying solidity were set to carry out the bearing plate test,and the height,welding distance,filler and underlaying solidity of the cell under the emergency rescue conditions were used to strengthen The impact of the roadbed provides a strong systematic analysis and theoretical basis for the selection of cells and fillers during the construction of emergency roads;and the paving of the test section was carried out to verify its site suitability.The main research contents and results are as follows:Firstly,through the research and analysis of the cell index system,the node of the cell is improved to increase the contact surface at the node,and the prismatic structure is set up.The improved cell has the advantages of delamination and slippage damage at the nodes;the prismatic structure at the nodes plays a role in distributing loads in the structural layer,and the overall bearing capacity of the structural layer is greatly improved.Secondly,through the indoor simulation test box test,comparatively study the influence of the cell welding distance,height,filler type and improved cell on the bearing capacity of the reinforced subgrade;the bearing plate test is used to conduct the vertical deformation and plastic deformation of different types of reinforced subgrade Measure the records and calculate the deformation modulus and elastic modulus of the reinforced subgrade as evaluation indicators.The results show that: the layout of the grid has greatly improved the bearing capacity of the reinforced subgrade,and the grid is used in the upper part to have a better reinforcement effect;comparative analysis of the reinforced subgrade shows that its bearing capacity decreases with the increase of the welding distance of the grid The deformation modulus and rebound modulus decrease accordingly;the vertical deformation and plastic deformation of the reinforced subgrade decrease with the increase of the height of the cell;under the effect of different fillers in the same cell,the two have different bearing capacities,and the larger the particle size of the filler The better the bearing capacity of the structural layer;the improved grid room has a higher reinforcement effect on the subgrade than the conventional grid room.The unique prismatic structure at the nodes makes the reinforced subgrade overall bearing capacity higher.Then,by setting four sets of different bearing solidity,comparative study of the vertical deformation,plastic deformation,deformation modulus and elastic modulus of the reinforced subgrade under different bearing solidity.The results show that the higher the degree of underpinning,the lower the vertical deformation and plastic deformation of the reinforced subgrade,and the larger the deformation modulus and elastic modulus.Furthermore,through the ABAQUS finite element analysis software to verify the indoor test,it is concluded that the size of the cell,the type of filler,and the solidity of the underlayer are important factors that affect the reinforcement effect of the cell;it is verified that the improved cell can effectively compensate the welding distance,The gap that the height brings to the reinforcement effect;by analyzing the changing rules of the tensile stress and tensile strain of the cell under different loads,the necessity of the layout of the protective layer during the construction process is determined.Finally,in order to further verify the correctness and rationality of the indoor experiments and theoretical research results in this paper,the S229 Yinpu Highway K19 ~ K20 section was selected for the paving of the test section,and the field test and industrial test of the heavy-duty vehicles Test to determine the feasibility of the scheme proposed in this article in the actual project.By comparing the reinforcement effect and economic and social effects of the conventional cell and the improved cell,it can be seen that although the cost of the improved cell is higher than that of the conventional cell,it greatly reduces the cell height and welding distance.The impact on the bearing capacity of the structural layer,and due to the special prismatic structure at the node,it is not easy to collapse when the cell is filled,the construction is convenient,and it reflects the high social and economic benefits.