A cement-modified soil-reinforced geogrid-reinforced soil structure and its construction method

Abstract

The invention discloses a cement modified soil strengthened geogrid reinforced soil structure and a construction method thereof. The cement modified soil strengthened geogrid reinforced soil structure (shown in a figure 1) is composed of four parts including a base layer (1) and a cover layer (9) composed of cement modified soil, a water drainage layer (2) and a cement modified soil strengthened geogrid reinforced soil layer thereof, and is a novel geogrid reinforced soil structure which is formed by improving similar structures through utilizing good properties including solidification, high wetting resistance, high anti-scouring and flood damage resisting properties, high shearing strength and the like of cement modified soil. Compared with an existing similar structure, the novel geogrid reinforced soil structure and the construction method thereof, provided by the invention, can realize panel-free construction of an abrupt-slope reinforced soil structure, and can also remarkably improve the wetting resistance, anti-scouring property and whole shearing strength of the geogrid reinforced soil structure; the cement modified soil strengthened geogrid reinforced soil structure is especially suitable for protecting and reinforcing edge slopes, which are easy to scour and damage by flood, of abrupt-slope sections.

Description

technical field [0001] The invention relates to a geogrid-reinforced soil structure, in particular to a cement-modified soil reinforced geogrid-reinforced soil structure, and the invention also relates to the cement-modified soil-reinforced geogrid-reinforced soil structure construction method. Background technique [0002] In recent years, scientific and technological workers in highway and water conservancy engineering have achieved good engineering benefits and technologies by transforming the traditional geogrid reinforced soil structure and applying it to the reinforcement and treatment of special soil (especially expansive soil) slopes. results. However, due to the existing new geogrid-reinforced soil structures, such as flexible support structures, geogrid-reinforced soil structures wrapped on both sides inside and outside, etc., it is impossible to offset the impact on the geotechnical engineering caused by the wetting and softening of the fill layer through the rei...

AI Technical Summary

Problems solved by technology

However, due to the existing new geogrid-reinforced soil structures, such as flexible support structures, geogrid-reinforced soil structures wrapped on both sides inside and outside, etc., it is impossible to offset the impact on the geotechnical engineering caused by the wetting and softening of the fill layer through the reinforcement of the geogrid. The weakening of the overall strength of the grid-reinforced soil structure, especially the sharp attenuation of the strength between the geogrid and the soil interface caused by the wetting and softening of the filler, cannot be directly used as filler at present. , using the existing geogrid-reinforced soil structure for the erosion and water damage treatment of argillaceous sandstone residual soil slopes and granite residual soil slopes in steep slopes in hot and humid areas in southern my country

At present, in the reinforcement technology of this kind of slope at home and abroad, the economical schemes such as the anchor cable frame beam structure are commonly used, and a technically reliable and economical reasonable scheme has not been found.

[0003] There are two main reasons for the above-mentioned slope water damage. On the one hand, the slope soil that is prone to water damage such as erosion and water damage is usually mainly non-cohesive soil, and the cohesion of the soil is very low. It has a large internal friction angle in the natural state, but once it is saturated with water, the internal friction angle of the soil drops sharply due to the softening of a small amount of clay dispersed in the soil, making the saturated shear strength of the soil close to that of soft soil; On the other hand, the scouring and water damage of steep slopes are often caused by the direct scouring of surface water during heavy rain or the rapid infiltration of surface water into the shallow surface soil of the slope, resulting in the rapid saturation of the surface soil and the collapse of the shallow saturated soil. Slip-slump damage, scour and shallow saturated soil slide-slump damage further promote each other, resulting in large-scale water damage to the slope after a heavy rain

Therefore, by upgrading the technology of geogrid-reinforced soil, how to overcome the shortcomings that the geogrid-reinforced soil structure formed by this type of soil filler will be easy to be scoured and destroyed by water, so that the geogrid-reinforced soil can be used in The application of this kind of soil on steep slope sections will find a technically reliable and economically reasonable treatment plan

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