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Study on Non Linear Creep Property of Weak Layer in Slope of Open Pit Coal Mine

Rui Yongqin ①, Xu Xiaohe ①,Ma Xinmin ②,Huo Qiyuan ②,Zhang Youdi ③,Zhou Changshou ③ (①?Department of Mining Engineering,CRISR,Northeastern University,Shenyang 110006,China;?②?Fushun Branch,Center Coal Research Institute,Fushun 113001,Chin  
The non linear creep property of the weak layer was analyzed and the change property of its mechanics strength and the non linear property of its stress strain relationship were indicated. On the basis of the aged theory, a common creep equation was proposed. Subsequently, the damage strain was defined as critical value from the steady state creep rate to the increasing state creep rate, and the relationship between the long term shear strength and the stress changing rate with time was concluded. As to the instability deformation of the creep slope, the strain rate of the steady state creep is associated with its shear stress level to exceed its shear strength limit.
【Fund】: 中国博士后科学基金;;煤炭部重点项目
【CateGory Index】: TD313
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