煤矸石粉改良膨胀土抗剪强度机理分析

doi:10.11799/ce201409040

Abstract

Abstract:

In order to improve the utilization rate of coal gangue and solve the problem of expansive soil when it was used in road construction, coal gangue powder was used to treat expansive soil. Laboratory direct shear test was conducted, 4%, 8%, 12% gangue powder's influence on expansive soil shear strength were analyzed , and the improving mechanism was proved by coal gangue pH value and gangue powder X-ray diffraction (XRD) . The results showed that the mixed with coal gangue can increase the shear strength of expansive soil,while decreased when the content reached to 8%, then increased again, shear strength is mainly composed of cohesion .The improving mechanism is that the soaking pH value in Wuhai coal gangue after 15 days between 3.8 to 5.8 , it was the acidic solution, the water content was decreased,while cohesion was increased,and the diffraction intensity of gangue powder after soaking was decreases,it was proved that there were a series of chemical reactions,precipitation of substances cemented with expansive soil or ion exchange reaction increased cohesion,thereby the shear strength of expansive soil was improved.

Key words: coal gangue, expansive soil, shear strength, pH value, XRD

CLC Number:

P642.16
X705

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Mechanism Analysis of Coal Gangue Powder Improving Shear Strength of Expansive Soil

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