Mountain road filling and excavation junction roadbed structure and construction method thereof

Abstract

The invention relates to a mountain road filling and excavation junction roadbed structure and construction method thereof. The roadbed structure includes a filling section, an excavation section anda transition section of junction of the filling and excavation sections. A transition step and an open drain are arranged at the filling section. A filling and excavation junction drainage system is arranged at the transition section of junction of the filling and excavation sections. The drainage system at the junction of the filling and excavation sections comprises a assembled transverse drainage blind ditch with a replaceable drainage body, a longitudinal through drainage blind ditch and a water permeation layer and water insulation layer combined transition section at the junction of thefilling and excavation sections. A combined drainage small conduit is arranged in the drainage system and the transition section step respectively. The bottom of the combined type drainage small conduit on the drainage system at the junction of the filling and excavation sections is connected with the longitudinal through drainage blind ditch. The longitudinal through drainage blind ditch is communicated with assembled transverse drainage blind ditch with the replaceable drainage body. According to the invention, the underground water level in the slope surface can be monitored in time throughthe arranged observation holes, the inner inclination angle and the size of the step of the transition section of the stone road section can be effectively controlled, the construction speed is accelerated, and the overall stability of the roadbed is improved.

Description

technical field [0001] The invention relates to a novel subgrade structure of mountain roads, in particular to a subgrade structure at the junction of filling and excavation of mountain roads and a construction method thereof. Background technique [0002] With the advent of the large-scale construction of expressways in our country, especially after the concept of "county-county expressways" is put forward, the construction of expressways will be transferred to mountainous areas. Due to the heavy weight, tight construction period, long rainy season in mountainous areas, and irregular construction, the high-fill subgrade is prone to subsidence, especially at the intersection of horizontal and vertical filling and excavation, where the subsidence is obvious, resulting in cracking and subsidence of the road surface. It has a great impact on traffic safety. Subgrade filling at the intersection of high-speed filling and excavation in mountainous areas has become a prominent pro...

AI Technical Summary

Problems solved by technology

The former is mainly to carry out over-excavation and backfill in the excavation section, and step excavation in the filling section. The main defect of this construction mode is that the step rolling in the filling section is not sufficient, which may easily lead to excessive settlement in the later stage. In addition, the junction of filling and excavation Due to the insufficient combination of old and new subgrades in the transition section, if no reinforcement treatment is carried out, the stability of the subgrade structure will be seriously affected; the latter means excavation on one side of the road, and at the same time, backfilling work on the other side of the road. This construction mode is very dependent on the lateral slope of the road. The construction method changes greatly with different slopes, so the applicability is relatively poor, and geocells need to be laid on the roadbed, which requires high strength and overlapping of geocells. , construction is difficult

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