黏粒含量及含水比对红黏土强度特性的影响OA北大核心CSTPCD

[Objective]In order to study the influence of different clay content and different water content ratio on the strength characteristics of red clay.[Methods]Taking Guilin red clay as the research object,clay was extracted from the red clay accord-ing to the principle of water settlement to prepare red clay samples with different clay content,and the consolidated undrained tri-axial test was carried out.The strength index and stress-strain relationship of red clay with different clay content and different water content ratio are analyzed.[Results]The test result show:With the addition of clay content,the cohesion of red clay increases from 30.57～37.71 kPa to 43.36～59.66 kPa,while the internal friction angle decreases from 18.0°～22.0° to 14.5°～15.5°.[Conclusion]The result show that the clay and water content ratio have a significant effect on the cohesion and internal friction angle of red clay.With the continuous addition of clay particles,the cohesion will continue to increase,and the internal friction angle will continue to decrease.However,as the water content increases,the cohesion decreases linearly and the internal friction angle increases linearly.The effect of clay content on cohesion and internal friction angle is more significant than that of water content.The stress-strain relation curve of clay content and water content ratio to red clay basically belongs to the hardening type.The larger the clay content,the better the hardening property.The larger the water content ratio,the smaller the principal stress difference of the soil,but the hardening property of the soil remains unchanged.It can be seen that the shear strength index of red clay is significantly affected by the clay content and water content ratio.