Construction method for preventing roadbed slope freeze-thaw instability in plateau frozen soil area

Abstract

The invention discloses a construction method for preventing roadbed slope freeze-thaw instability in a plateau frozen soil area. The construction method comprises the steps of foundation pit survey setting-out, foundation pit excavation treatment, formwork installation, construction of an inverted-inclined type immersed road shoulder wall and backfill construction of the wall back of the road shoulder wall. Before a foundation pit is excavated, the excavation depth and the excavation side boundary of the foundation pit are determined according to the original ground elevation, the designed elevation of the bottom of the inverted-inclined type road shoulder wall and the geometric dimension of the inverted-inclined type road shoulder wall, lime lines are sprayed for identification, foundation excavation is conducted according to the identification, and after excavation is conducted to the designed elevation, floating soil of a base is removed and leveled; and after the base is tamped, an inverted-inclined type immersed road shoulder wall formwork is installed, after installation is completed, the inverted-inclined type immersed road shoulder wall is poured and maintained, and finally wall back backfill is conducted. According to the scheme, a drainage system is arranged in the inverted-inclined type road shoulder wall, water retained in the roadbed due to freezing and thawing ofthe roadbed slope can be effectively drained, and then the phenomenon of instability caused by freezing and thawing of the roadbed slope in the plateau frozen earth area is controlled.

Description

technical field [0001] The invention relates to the technical field of roadbed slope construction, in particular to a construction method for preventing freeze-thaw instability of roadbed slopes in plateau permafrost regions. Background technique [0002] As we all know, the problem of freezing and thawing of highway slopes has always been one of the urgent problems to be solved in the construction of highways in plateau permafrost areas. In the permafrost environment of plateau areas, frost heaving is severe in winter, and thawing in spring is easy to cause muddying, which has great impact on the stability of highway slopes. have a greater impact. [0003] Since the geological environment of this road section is the soft soil in the plateau permafrost area, there are many freeze-thaw cycles. After the permafrost thaws, the soil has a high water content and is prone to water seepage and permeation. The strength of the slope will decrease significantly. After the melting cyc...

AI Technical Summary

Problems solved by technology

[0003] Since the geological environment of this road section is the soft soil in the plateau permafrost area, there are many freeze-thaw cycles. After the permafrost thaws, the soil has a high water content and is prone to water seepage and water seepage. The strength of the slope will be significantly reduced. After the melting cycle, it will eventually cause the slope to collapse