Compaction process of collapsible loess roadbeds

Abstract

The invention discloses a compaction process of collapsible loess roadbeds. The compaction process comprises the steps of 1, natural water content measuring; 2, water replenishing, turning and braising; 3, water content inspecting and truck loading; 4, spreading, static pressing and leveling; 5, rolling, wherein the loess roadbeds subjected to the leveling treatment sequentially undergo the treatment of one time of static pressing, two times of spiky rolling, leveling by a land leveling machine, two times of vibratory pressing and one time of static pressing and shining, and the rolling operation needs to be carried out for six times. According to the compaction process, reasonable filling construction can be realized on the dry condition of the northwest district, the roadbeds at the collapsible loess section are rolled for six times in the filling construction process, and therefore the filling construction quality of the roadbeds is guaranteed further; sedimentation at the later stage can be reduced, high safety capacity can be obtained, the stability of the roadbeds can be guaranteed, and diseases can be avoided.

Description

technical field [0001] The invention belongs to the technical field of highway subgrade construction, and in particular relates to a collapsible loess subgrade compaction process. Background technique [0002] Collapsible loess is formed under arid climate conditions. In the initial stage of formation, a small amount of seasonal rainwater aggregates the loose silt particles, while long-term drought makes the water evaporate continuously, forming a multi-layered loess with coarse silt particles as the main skeleton. void structure. It is characterized by high and low compressibility in the natural dry state. Once a large amount of precipitation or channel water infiltrates, various soluble salts in the loess will be dissolved after soaking, and the cementing force in the soil will weaken. Under the joint action of a certain load, the soil structure is rapidly destroyed, and the bearing capacity is also sharply reduced, resulting in a large amount of collapsible deformation, ...

AI Technical Summary

Problems solved by technology

[0004] For example, if the soil layer is 30cm thick under normal construction, the compaction degree of this layer is greater than 93% through on-site inspection, and the expected effect can be achieved for this type of loess layer, but it will partially destroy the adjacent compacted soil layer The effect is to make the upper part of the compacted soil layer loose, the compaction density is reduced, and the compaction degree is reduced by about 5%, which cannot even meet the standard minimum compaction degree requirement.