阿勒山露天煤矿边坡层间薄层滑带土蠕变特性研究
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摘要
以阿勒山露天煤矿蠕变失稳边坡为例,采用室内三轴剪切试验,获取滑带土试样在不同围压和应力水平下的应变规律,并进一步采用等时曲线法确定滑带土长期强度。研究表明,层间薄层滑带土具有典型的蠕变特征,蠕变阶段可分为衰减蠕变和稳定蠕变2个变形过程;滑带土绝对蠕变量和稳定蠕变阶段的变形速率均与轴向应力值呈正相关,而衰减蠕变阶段的持续时间随着剪应力水平增加基本呈线性增加。滑带土长期强度小于相同条件下的瞬时强度,与常规强度参数比较,其长期黏聚力C值和长期摩擦角准值分别下降24.8%和22.4%。
In this paper, taking the creep instability slope of Aleshan Opencast Coal Mine as an example, the triaxial shear test was carried out in laboratory to obtain the strain laws of the sliding belt soil samples under different confining pressures and stresses, and the isochronous curve method was further used to determine the long-term strength of the sliding belt soil. The study shows that the interlayer thin strip soil has typical creep characteristics, and the creep stage can be divided into two deformation processes: the attenuated creep and the stable creep. The absolute creep and the deformation rate of the stable creep stage are all positively correlated with the axial stress value, while the duration of the creep stage increases with the shear stress level. There is a linear increase. The long-term strength of the sliding zone soil is less than that of the same condition. Compared with the conventional strength parameters, the long-term cohesive C value and the long-term friction angle of the soil decreased by 24.8%and 22.4% respectively.
In this paper, taking the creep instability slope of Aleshan Opencast Coal Mine as an example, the triaxial shear test was carried out in laboratory to obtain the strain laws of the sliding belt soil samples under different confining pressures and stresses, and the isochronous curve method was further used to determine the long-term strength of the sliding belt soil. The study shows that the interlayer thin strip soil has typical creep characteristics, and the creep stage can be divided into two deformation processes: the attenuated creep and the stable creep. The absolute creep and the deformation rate of the stable creep stage are all positively correlated with the axial stress value, while the duration of the creep stage increases with the shear stress level. There is a linear increase. The long-term strength of the sliding zone soil is less than that of the same condition. Compared with the conventional strength parameters, the long-term cohesive C value and the long-term friction angle of the soil decreased by 24.8%and 22.4% respectively.
引文
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[3]蒋秀姿,宝萍.缓慢复活型滑坡滑带土的蠕变性质与特征强度试验研究[J].岩土力学,2015,36(2):495.
[4]孙淼军,唐辉明,王潇弘,等.蠕动型滑坡滑带土蠕变特性研究[J].岩土力学,2017,38(2):385-391.
[5] CHANG K T, GE L, LIN H H. Slope creep behavior:observations andsimulations[J]. Environmental Earth Sciences, 2015, 73(1):275-287.
[6]贺可强,陈为公,张朋.蠕滑型边坡动态稳定性系数实时监测及其位移预警判据研究[J].岩石力学与工程学报,2016,35(7):1377-1385.
[7]辛鹏,吴树仁,石菊松,等.簸箕山大型老滑坡滑动带的结构特征及形成机制试验研究[J].岩石力学与工程学报,2013,32(7):1382-1391.
[8]姜景山,程展林,左永振,等.粗粒土CT三轴流变试验研究[J].岩土力学,2014,35(9):2507-2514.
[9]胡新丽,孙淼军,唐辉明,等.三峡库区马家沟滑坡滑体粗粒土蠕变试验研究[J].岩土力学,2014,35(11):3163-3169.
[10]蒋昱州,朱杰兵,王瑞红.软硬互层岩体卸荷蠕变力学特性试验研究[J].岩石力学与工程学报,2012,31(4):778-784.
[11]陈宗基.Structure mechanics of clays[J].中国科学,1959,8(1):41-45.
[12]陈宗基,康文法,黄杰藩.岩石的封闭应力,蠕变和扩容及本构方程[J].岩石力学与工程学报,1991,10(4):299-312.