Mudstone filled roadbed structure and construction method thereof

Abstract

The invention relates to a mudstone filled roadbed structure and a construction method thereof. When the roadbed is constructed in a mudstone developing area, a water collecting tank is arranged in a soil base, a waterproof layer is paved on the surface of soil base, a mudstone layer is constructed on the waterproof layer, a water-sealing leveled layer is constructed on the mudstone layer, a leveled acceptance layer is constructed on the lower embankment, and a modified soil layer is paved on the road bed. The roadbed is pressed by a crusher, a bulldozer, and sheep-foot roller and is pressed by a layering vibrating press technology and a punching supplement pressure technology. Through controlling the size and uniformity of mudstone particles, the overall stability and strength of roadbed are improved, and the uneven settlement of roadbed is reduced. Moreover, the phenomenon that mudstone is softened by water and is converted into mud is avoided. The engineering quality can be guaranteed, and at the same time, the modified soil bed can meet the related acceptance standards. The practices have proven that the provided method can achieve a good technical effect in mudstone roadbed construction.

Description

technical field [0001] The invention belongs to the technical field of roadbed reinforcement construction, in particular to a mudstone filling roadbed structure and a construction method thereof. Background technique [0002] Mudstone is a material between hard rock and soil. The main mineral components are kaolinite, illite, montmorillonite, sericite, etc. It has low compressive strength, easy weathering, easy softening in contact with water, and collapse Decomposition, expansion, and filling density are sensitive to water content, etc., and are widely distributed in my country. Mudstone is highly hydrophilic. When water seeps in, the adsorbed water film of fine particles will thicken, causing the volume of the rock to expand. This expansion is uneven, causing uneven stress in the rock, resulting in the fragmentation of rock particles. . It is more common in highway engineering construction. It is a natural road construction material with soft rock and poor water stability...

AI Technical Summary

Problems solved by technology

[0004] First, the uniformity of mudstone particles is poor, and the proportion of super-sized particles is large. Using it as roadbed filler will not only affect the thickness of embankment layered filling, but also pose a serious threat to the compaction quality;

[0005] The second is that mudstone is mixed with particles of different weathering degrees, which is difficult to distinguish. It is not a soil-filled roadbed or a rock-filled roadbed, and it is not exactly the same as an earth-rock mixed-filled roadbed. The construction methods cannot be fully adapted to each other;

[0006] The third is the problem of water softening. After the rainfall, the mudstone roadbed is softened, humidified, and muddy in a large area, which cannot meet the quality requirements. The roadbed needs to be opened, dried, backfilled, and then re-rolled before the roadbed can continue to be filled. structure, which greatly affects the construction progress of the project and increases the project cost;

[0007] The fourth is the problem of waterproofing and drainage of the roadbed. In areas with abundant groundwater, the flowing groundwater will scour the mudstone roadbed filling. At the same time, due to the infiltration of groundwater into the roadbed, capillarity occurs, the bearing capacity of the roadbed is reduced, vertical settlement occurs, and basement instability is prone to occur. resulting lateral slip;

[0008] Fifth, in actual construction, if the mudstone is directly filled to the bottom of the road bed, that is, to the top of the embankment, it is often encountered that no matter what kind of improved soil is used for filling the road bed, how to increase the rolling tonnage and number of times is difficult. Bed compaction is difficult to meet the requirements of engineering quality

However, these methods have problems such as applicability and difficulty in construction quality control. According to stone filling treatment, the construction quality inspection will easily fail, and large-scale damage to the roadbed and pavement will occur in the later stage, which will bring huge potential safety hazards; the replacement of filling materials will increase the project cost. , prolong the construction period and damage the ecological environment

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