고결모래의 강도정수와 일축압축강도 관계

Relation of the Strength Parameter and the Unconfined Compressive Strength in Cemented Sand

In this study, a series of CID tests were performed on gypsum-cemented specimens to determin the cohesion intercept and the confined stress start to break the cementation bonds (${q_i}'_{(BP)}$). And the relationships between the unconfined compressive strength ($q_{ucs}$) and cohesion intercept or ${q_i}'_{(BP)}$ were investigated. From the experiments, it was concluded that the friction angle of cemented sands is not affected by cementation while the cohesion intercept of cemented sands significantly influenced by cementation and is constant before ${q_i}'_{(BP)}$. By an analytical interpretation, the failure strength of cemented specimen could be represented by summation of the failure strength of uncemented specimen and the unconfined compressive strength of cemented one. And the cohesion intercept of cemented specimen was represented as a linear relation with the unconfined compressive strength. Those analytical values of failure strength and cohesion intercept almost coincided with the experimental values of those. In addition, the ${q_i}'_{(BP)}$ also could be related with unconfined compressive strength linearly.