High-fill subgrade filling construction method applicable to red clay regions in mountainous and hilly areas

Abstract

The invention discloses a high-fill subgrade filling construction method applicable to red clay regions in mountainous and hilly areas. According to the method, the upper part of the foundation of a high-fill section is mainly composed of cultivated soil, artificial fill and sludge at the bottoms of ditches and ponds, and a lower soil layer is mainly composed of silty clay, red clay, limestone, etc.; an upper soil layer has poor engineering quality and is treated through excavation, replacement and filling; after replacement and filling with plain soil, a ground surface is subjected to impactrolling; after rolling, a test is carried out; if the ground surface is qualified according to test results, site formation is carried out; topsoil on a place to be constructed is removed, a surface loose soil layer is rolled, an access road for mechanical equipment is built, and surface water is eliminated; drainage ditches are dug around a construction area to ensure the smooth drainage of a site; the horizontal elevation of a filling surface is measured, and a horizontal mark is made to control the layer thickness of a fill. The method can reasonably utilize red clay in a local region, lower engineering cost and reduce damage to natural environment.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for high-fill roadbed filling in red clay soil areas in mountainous hills. Background technique [0002] When carrying out high-fill roadbed construction in red clay areas such as mountains and hills, due to the large amount of red clay excavation and backfill, red clay cannot be directly used as the filling construction in road base sections and high-fill slope areas; In general, there are many kinds of clays in the area. The expansion of expansive soil is irregular, and the expansion and contraction properties of the same soil layer are also very different. The expansive soil itself has the characteristics of water absorption, expansion and water loss. Therefore, it often leads to the expansion and contraction of building foundations. It can cause deformation, cracking and damage of buildings, which has a great impact on low-load shallow foundation bui...

AI Technical Summary

Problems solved by technology

[0002] When carrying out high-fill roadbed filling construction in mountainous hills and other areas where red clay is used, due to the large amount of excavation and backfilling of red clay, red clay cannot be directly used for filling construction in roadbed sections and high-fill slope areas; Generally, there are many kinds of clay in the lot, and the expansion of expansive soil is irregular, and the expansion and contraction of the same soil layer are also very different. Expansive soil itself has the characteristics of water absorption and water loss contraction, so it often leads to expansion and contraction deformation of building foundations. Cause deformation, cracking and damage of buildings, and have a greater impact on low-load shallow foundation buildings

In order to carry out high-fill subgrade filling construction, it is necessary to discard the excavated red clay and purchase earthwork, which increases the high cost