In the reconstruction and extension project of mountainous highway, it is difficult to choose the route scheme for some sections. The main reason is the comprehensive choice of alignment parameters, project cost and environmental protection. In this paper, a TOPSIS evaluation method based on entropy weight method is proposed. From the most concerned aspects of route scheme selection, 11 indexes are selected, including minimum horizontal curve radius, longitudinal slope value, horizontal and vertical combination, first part cost, filling and excavation balance, proportion of high filling and deep excavation section, bridge tunnel ratio, space type, slope masonry ratio, roadside safety assurance degree and number of access points, the entropy weight method is used to determine the weight of the index, and then the TOPSIS method is used to calculate the distance between each scheme and the ideal solution, so as to judge the advantages and disadvantages of each scheme. The method is applied in practical engineering. The evaluation method provides a new idea for the selection of route scheme in the reconstruction and expansion project.
Roadbed pavement drainage design is an important part of road design, and subsurface drainage design is another difficult part of the whole drainage design. In this paper, the engineering example of mountainous highway is used to numerically simulate the actual highway seepage field by SEEP/W software for the concealed drainage design problem of highway roadbed based on unsaturated soil theory. Simulation results show that plastic blind trench has better drainage collection capacity than gravel blind trench. In highway engineering, plastic blind trench can be used as a kind of concealed drainage facility for roadbed with excellent performance.
Using the typical section of semi-filled and semi-cut subgrade in the mountainous area of Guizhou, based on the GEOSEEP/ W program analysis of subgrade drainage problems, the seepage field changes under 48 hours of rainfall are simulated, and the seepage field and the subgrade in the subgrade are analyzed according to the rainfall time. Changes in pore pressure. Through the comparison of plastic blind ditch materials and crushed stone blind ditch materials. The simulation result shows that the water flow rate in the gravel blind ditch gradually decreases 6 hours after the beginning of the rain, but the water flow rate in the plastic blind ditch reaches the peak, and the water flow rate is much higher than the former, highlighting the superiority of the plastic blind ditch. It is of great significance for the plastic blind ditch material to effectively improve the drainage problem of the roadbed.
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