Method for improving expansive soil by using novel engineering material nano graphite powder

Abstract

The invention relates to the technical field of geotechnical engineering, and discloses a method for improving expansive soil by using a novel engineering material nano graphite powder. The method comprises the following steps: drawing a relation curve of the axial stress and the axial strain by taking the axial stress as a vertical coordinate and the axial strain as a horizontal coordinate; taking the maximum axial stress on the curve as the unconfined compressive strength, and taking the axial stress corresponding to 15% of the axial strain as the unconfined compressive strength of the improved soil when the peak value on the curve is not obvious. The beneficial effects are as follows, according to the method for improving the expansive soil by using the novel engineering material nano graphite powder, the expansive soil is improved by selecting the nano graphite powder; the influence rule of the nano-graphite powder on the strength characteristics of the expansive soil is explored,the optimal mixing amount of the nano-graphite powder under different dry densities is determined, and the optimal mixing amount of the nano-graphite powder under the condition of unknown soil body dry density is analyzed. A deep understanding is provided for the application of the nano material in geotechnical engineering and the exploration of a novel material.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a method for improving expansive soil by using nano-graphite powder, a novel engineering material. Background technique [0002] Expansive soils are highly plastic clays composed of strongly hydrophilic clay minerals that are ubiquitous in many regions of the world, especially in arid and semi-arid climates. Expansive soil has engineering characteristics such as multi-fissure, over-consolidation, strength attenuation, water absorption expansion, and dehydration shrinkage. Seasonal water content changes cause periodic volume expansion and contraction. This phenomenon is likely to cause subgrade deformation and slope Engineering disasters such as instability and building cracking, the losses caused by problems related to expansive soils are more than twice the average total losses caused by natural disasters such as floods, earthquakes, and tornadoes. T...

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Problems solved by technology

Existing studies have shown that traditional soil amendments have a series of problems in actual engineering use, such as high cost, poor improvement effect, easy cracking, slow strength growth, poor water stability, and environmental pollution.

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