低灰砂比细粒尾砂堆存体抗液化强度试验研究  

Liquefaction resistance of fine tailings cemented deposit

作　　者：王洪江[1,2] 白龙剑 张玺 余健[1,2] 田志刚 杜向红 WANG Hong-jiang;BAI Long-jian;ZHANG Xi;YU Jian;TIAN Zhi-gang;DU Xiang-hong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of High-Efficient Mining and Safety of Metal Mines,Ministry of Education,Beijing 100083,China;Shenzhen Zhongjin Lingnan Non-ferrous Metal Company Limited,Shaoguan 512000,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083 [3]深圳市中金岭南有色金属股份有限公司,韶关512000

出　　处：《中国有色金属学报》2023年第9期3092-3103,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基金项目(51834001)。

摘　　要：为了评估细粒尾砂堆存体受到爆破或矿震等动力荷载时的抗液化强度,探明堆存体无侧限抗压强度(UCS)、循环应力比(CSR)和有效围压对其抗液化强度的影响规律,对细粒尾砂堆存体试样开展动三轴试验。本文分析了不同强度堆存体动孔隙水压力、动变形、应力-应变关系和有效应力路径发展规律,构建了堆存体液化循环次数的预测模型。结果表明:低灰砂比堆存体动孔隙水压力比达到0.95的时间总早于轴向应变达到5%的时间。液化循环次数随UCS和有效围压增加呈线性增长,随CSR增长呈负幂函数下降。液化循环次数对UCS最为敏感,其次是有效围压。当循环应力比小于0.12时,液化循环次数大于249次,液化风险较低。可根据UCS与液化循环次数的关系,设计配比以保证井下堆存体不液化。In order to evaluate the liquefaction resistance of low cement fine tailings cemented deposit subjected to dynamic loads such as blasting or mine earthquake.Ascertain the influence of unconfined compressive strength(UCS),cyclic stress ratio(CSR)and effective confining pressure on the liquefaction resistance.Dynamic triaxial tests were carried out on fine tailings cemented deposit.In this paper,the development law of dynamic pore water pressure,dynamic deformation,stress-strain relationship and effective stress path of different strength deposits are analyzed.A prediction model for vibration number of liquefaction of the deposit is constructed.The results show that the time when the dynamic pore water pressure ratio of the cemented deposit with low ash sand ratio reaches 0.95 is earlier than that when the axial strain reaches 5%.The cycle number of liquefaction increases linearly with the increase of UCS and effective confining pressure,and decreases in a negative power function with the increase of CSR.The cycle number of liquefaction is the most sensitive to UCS,and is the second sensitive to effective confining pressure.When the cyclic stress ratio is less than 0.12,the cycle number of liquefaction is more than 249,and the liquefaction risk is low.The slurry ratio can be designed according to the relationship between UCS and cycle number of liquefaction to ensure that the underground tailings cemented deposit is not liquefied.

关 键 词：细粒尾砂 堆存体 液化 低灰砂比 动三轴试验 

分 类 号：TD982[矿业工程—选矿]