循环荷载作用下冻结灰砂岩强度特征与弹性模量演化规律
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摘要
针对典型中生代富水弱胶结地层中的灰砂岩,利用TDW-200冻土三轴试验机对冻结饱水灰砂岩进行常规三轴压缩试验和循环加卸载试验,分析不同围压条件下的强度特征,重点研究了循环加卸载作用下冻结灰砂岩弹性模量的演化规律。试验结果表明:循环加卸载时,在低围压下峰值强度有所增加,而在高围压下峰值强度有"弱化"的现象;冻结灰砂岩试样加卸载全过程中弹性模量的变化规律与加卸载路径变化趋势具有一致性;单个滞回环内,切线弹性模量随着偏应力水平的增加呈现出先增加后减小的趋势,同一偏应力水平下,切线模量随循环次数的增加也表现为先增加后减小趋势。
The triaxial compression test and cyclic loading test were carried out on frozen sandstone samples cut from weakly cemented water-rich Mesozoic gray sandstones using TDW-200 frozen soil triaxial test apparatus. The strength characteristics and the evolution rules of elastic modulus were studied based on the experimental results. The test results show that while the peak strength increases under low confining pressure,it decreases under high confining pressure in cyclic loading test; during the whole process of cyclic loading,the tendency of elastic modulus is consistent with the path of cyclic loading; for each hysteretic loop,the tangent modulus increases first then decreases with the increase of deviatoric stress,it has the same tendency with the increase of cycle number when the deviatoric stress is the same.
The triaxial compression test and cyclic loading test were carried out on frozen sandstone samples cut from weakly cemented water-rich Mesozoic gray sandstones using TDW-200 frozen soil triaxial test apparatus. The strength characteristics and the evolution rules of elastic modulus were studied based on the experimental results. The test results show that while the peak strength increases under low confining pressure,it decreases under high confining pressure in cyclic loading test; during the whole process of cyclic loading,the tendency of elastic modulus is consistent with the path of cyclic loading; for each hysteretic loop,the tangent modulus increases first then decreases with the increase of deviatoric stress,it has the same tendency with the increase of cycle number when the deviatoric stress is the same.
引文
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[2]姚直书,王再举,程桦.冻结壁融化期间井壁受力变形分析与壁间注浆机理[J].煤炭学报,2015,40(6):1383-1389.YAO Zhishu,WANG Zaiju,CHENG Ye.Analysis of forced deformation of shaft lining and study of grouting mechanism during the melting of frozen wall[J]. Journal of China Coal Society,2015,40(6):1383-1389.
[3]赵永川,杨天鸿,肖福坤,等.西部弱胶结砂岩循环载荷作用下塑性应变能变化规律[J].煤炭学报,2015,40(8):1813-1819.ZHAO Yongchuan,YANG Tianhong,XIAO Fukun,et al. The variation law of plastic strain energy of western weak cemented sandstone during cyclic loading experiment[J].Journal of China Coal Society,2015,40(8):1813-1819.
[4]刘波,刘念,李东阳,等.含冰软弱面的冻结裂隙红砂岩的强度试验[J].煤炭学报,2016,41(4):843-849.LIU Bo,LIU Nian,LI Dongyang,et al.Strength test on frozen cracked red sandstone combined with ice[J].Journal of China Coal Society,2016,41(4):843-849.
[5] XIAO J Q,DING D X,JIANG F L,et al.Fatigue damage variable and evolution of rock subjected to cyclic loading[J].International Journal of Rock Mechanics&Mining Sciences,2010,47(3):461-468.
[6] PALCHIK V. Influence of porosity and elastic modulus on uniaxial compressive strength in soft brittle porous sandstones[J].Rock Mechanics and Rock Engineering,1999,32(4):303-309.
[7] ALBER M,KAHRAMAN S.Predicting the uniaxial compressive strength and elastic modulus of a fault breccia from texture coefficient[J]. Rock Mechanics and Rock Engineering,2009,42(1):117-127.
[8]周家文,杨兴国,符文熹,等.脆性岩石单轴循环加卸载试验及断裂损伤力学特性研究[J].岩石力学与工程学报,2010,29(6):1172-1183.ZHOU Jiawen,YANG Xingguo,FU Wenxi,et al. Experimental test and fracture damage mechanical characteristics of brittle rock under uniaxial cyclic loading and unloading conditions[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(6):1172-1183.
[9]张向阳,成建,康永红,等.循环加卸载下岩石变形破坏的损伤、能量分析[J].有色金属(矿山部分),2011,63(5):41-45.ZHANG Xiangyang,CHENG Jian,KANG Yonghong,et al. Analysis on damage and energy during rock deformation under cyclic loading and unloading conditions[J]. Nonferrous Metals(Mining Section),2011,63(5):41-45.
[10]彭瑞东,鞠杨,高峰,等.三轴循环加卸载下煤岩损伤的能量机制分析[J].煤炭学报,2014,39(2):245-252.PENG Ruidong,JU Yang,GAO Feng,et al. Energy analysis on damage of coal under cyclical triaxial loading and unloading conditions[J]. Journal of China Coal Society,2014,39(2):245-252.
[11]田文岭,杨圣奇,方刚.煤样三轴循环加卸载力学特征颗粒流模拟[J].煤炭学报,2016,41(3):603-610.TIAN Wenling,YANG Shengqi,FANG Gang. Particle flow simulation on mechanical behavior of coal specimen under triaxial cyclic loading and unloading[J]. Journal of China Coal Society,2016,41(3):603-610.
[12]左建平,谢和平,孟冰冰,等.煤岩组合体分级加卸载特性的试验研究[J].岩土力学,2011,32(5):1287-1296.ZUO Jianping,XIE Heping,MENG Bingbing,et al. Experimental research on loading-unloading behavior of coal-rock combination bodies at different stress levels[J]. Rock and Soil Mechanics,2011,32(5):1287-1296.
[13]尤明庆,苏承东.大理岩试样循环加载强化作用的试验研究[J].固体力学学报,2008,29(1):66-72.YOU Mingqing,SU Chengdong. Experimental study on strengthening of marble specimen in cyclic loading of uniaxial or pseudo triaxial compression[J]. Chinese Journal of Solid Mechanics,2008,29(1):66-72.
[14]徐速超,冯夏庭,陈炳瑞.矽卡岩单轴循环加卸载试验及声发射特性研究[J].岩土力学,2009,30(10):2929-2934.XU Suchao,FENG Xiating,CHEN Bingrui. Experimental study of skarn under uniaxial cyclic loading and unloading test and acoustic emission characteristics[J]. Rock and Soil Mechanics,2009,30(10):2929-2934.
[15]汪泓,杨天鸿,刘洪磊,等.循环荷载下干燥与饱和砂岩力学特性及能量演化[J].岩土力学,2017,38(6):1-9.WANG Hong,YANG Tianhong,LIU Honglei,et al. Mechanical properties and energy evolution of dry and saturated sandstones under cyclic loading[J].Rock and Soil Mechanics,2017,38(6):1-9.
[16] LAI Y M,YANG Y G,CHANG X X,et al.Strength criterion and elastoplastic constitutive model of frozen silt in generalized plastic mechanics[J]. International Journal of Plasticity,2010,26(10):1461-1484.
[17] LAI Y M,JIN L,CHANG X X. Yield criterion and elasto-plastic damage constitutive model for frozen sandy soil[J].International Journal of Plasticity,2009,25(6):1177-1205.
[18] HEAP M J,FAULKNER D R.Quantifying the evolution of static elastic properties as crystalline rock approaches failure[J]. International Journal of Rock Mechanics&Mining Sciences,2008,45(4):564-573.
[19]苏承东,熊祖强,翟新献,等.三轴循环加卸载作用下煤样变形及强度特征分析[J].采矿与安全工程学报,2014,31(3):456-461.SU Chengdong,XIONG Zuqiang,ZHAI Xinxian,et al. Analysis of deformation and strength characteristics of coal samples under the triaxial cyclic loading and unloading stress path[J].Journal of Mining&Safety Engineering,2014,31(3):456-461.