劈裂损伤岩石胶结强化的蠕变特性与失稳模式
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摘要
通过RLW-2000型三轴流变仪,对2组13个损伤试样进行胶结重增量加载蠕变试验,研究了损伤岩石胶结试样在不同蠕变应力水平下瞬时应变与蠕变应变特性,分析了不同胶结状态及胶结厚度对试样蠕变破坏强度影响,确定了胶结厚度与试样瞬时应变、蠕变应变关系,探讨了胶结试样蠕变破坏形态,确定了胶结试样蠕变破坏基本模式。结果表明:随着蠕变应力水平提高,2组试样瞬时应变均表现为减小趋势,大理岩和粗砂岩试样蠕变应变分别表现增加与减小趋势;紧缝胶结试样蠕变破坏强度大于无胶结试样,但随着胶结厚度增加,胶结试样蠕变破坏强度呈现减小趋势;在相同蠕变应力水平下,随着胶结厚度增加,胶结试样蠕变应变呈缓慢增加趋势,但蠕变应变增加幅度小于瞬时应变;紧缝胶结试样破坏主控面单一,主控面角度近似垂直,且破裂块体较大,而厚度胶结试样破坏主控面复杂,且试样上下部滑移错动失稳明显;胶结试样蠕变破坏模式分为分离破坏模式、贯穿劈裂模式与贯穿滑移模式。
The creep test of incremental loading is carried out on thirteen damaged rock samples in two groups through RLW-2000 triaxial rheology test system. Instantaneous strain properties and creep ones of cement samples of damaged rock are studied in different creep stress. The effects of different cement state and thickness on the breaking strength of creep are analyzed. The relationships between cement thickness and instantaneous strain and creep one are determined. The creep failure modes of cemented sample are discussed and its basic mode is determined. The results have shown that, with creep stress increasing, instantaneous strain of all the samples in two groups decreases. Creep strain of the marble samples increases and that of coarse sandstone decreases. Creep failure strength of narrow-slit cement samples are more than that of no-cement samples, but creep failure strength decreases with cement thickness increasing. Creep strain of cement samples increases slowly with cement thickness increasing in same creep stress, while the increasing range of creep strain is less than that of instantaneous one.Main failure surface of narrow-slit cement samples is simple and approximately right angle, with larger broken block. In contrast, main failure surface of thickness cement sample is complicated, and slip and dislocation is obvious between the upper and the lower of the sample. Creep failure of cementation samples includes three modes: split failure, fracture splitting, fracture slipping.
The creep test of incremental loading is carried out on thirteen damaged rock samples in two groups through RLW-2000 triaxial rheology test system. Instantaneous strain properties and creep ones of cement samples of damaged rock are studied in different creep stress. The effects of different cement state and thickness on the breaking strength of creep are analyzed. The relationships between cement thickness and instantaneous strain and creep one are determined. The creep failure modes of cemented sample are discussed and its basic mode is determined. The results have shown that, with creep stress increasing, instantaneous strain of all the samples in two groups decreases. Creep strain of the marble samples increases and that of coarse sandstone decreases. Creep failure strength of narrow-slit cement samples are more than that of no-cement samples, but creep failure strength decreases with cement thickness increasing. Creep strain of cement samples increases slowly with cement thickness increasing in same creep stress, while the increasing range of creep strain is less than that of instantaneous one.Main failure surface of narrow-slit cement samples is simple and approximately right angle, with larger broken block. In contrast, main failure surface of thickness cement sample is complicated, and slip and dislocation is obvious between the upper and the lower of the sample. Creep failure of cementation samples includes three modes: split failure, fracture splitting, fracture slipping.
引文
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[19]黄明,刘新荣,邓涛.考虑含水劣化的泥质粉砂岩单轴蠕变特性研究[J].福州大学学报(自然科学版),2012,40(3):399-405.HUANG Ming,LIU Xinrong,DENG Tao.Study on the creep properties of T2b2 siltite in terms of the damage law induced by water[J].Journal of Fuzhou University(Natural Science Edition),2012,40(3):399-405.
[20]王更峰,张永兴,熊晓晖,等.深埋大变形隧道炭质板岩蠕变特性试验[J].公路交通科技,2012,29(9):95-102.WANG Gengfeng,ZHANG Yongxing,XIONG Xiaohui,et al.Experiment of creep characteristics of carbonaceous slate of deep-buried tunnel with large deformation[J].Journal of Highway and Transportation Research and Development,2012,29(9):95-102.
[21]赵宝云,刘东燕,郑颖人,等.红砂岩单轴压缩蠕变试验及模型研究[J].采矿与安全工程学报,2013,30(5):744-747.ZHAO Baoyun,LIU Dongyan,ZHENG Yingren,et al.Uniaxial compressive creep test of red sandstone and its constitutive model[J].Journal of Mining&Safety Engineering,2013,30(5):744-747.
[2]高延法,曲祖俊,牛学良,等.深井软岩巷道围岩流变与应力场演变规律[J].煤炭学报,2007,32(12):1244-1252.GAO Yanfa,QU Zujun,NIU Xueliang,et al.Rheological law for soft-rock tunnel and evolution law for stress field in deep mine[J].Journal of China Coal Society,2007,32(12):1244-1252.
[3]韩立军,贺永年,蒋斌松,等.环向有效约束条件下破裂岩体再破坏特性分析[J].岩石力学与工程学报,2008,27(增刊2):3483-3489.HAN Lijun,HE Yongnian,JIANG Binsong,et al.Analysis of refracture properties of cracked rock mass under hoop effective constraint[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(Sup 2):3483-3489.
[4]王瑞红,邓捷,刘杰,等.节理对砂岩变形及破坏特征影响研究[J].地下空间与工程学报,2017,13(1):93-100.WANG Ruihong,DENG Jie,LIU Jie,et al.Influence of joint on deformation and failure characteristics of sandstone[J].Chinese Journal of Underground Space and Engineering,2017,13(1):93-100.
[5]彭潜,肖庆华,尹健民,等.高应力软岩隧道开挖优化及锚杆加固效果研究[J].地下空间与工程学报,2017,13(增刊1):245-250.PENG Qian,XIAO Qinghua,YIN Jianmin,et al.Research on excavation optimization and the reinforcement effect of anchor rod of soft surrounding rock in high stress tunnel[J].Chinese Journal of Underground Space and Engineering,2017,13(Sup 1):245-250.
[6]张农,侯朝炯,陈庆敏,等.岩石破坏后的注浆固结体的力学性能[J].岩土力学,1998,19(3):50-53.ZHANG Nong,HOU Chaojiong,CHEN Qingmin,et al.Mechanical properties of broken rock after grouting reinforcement[J].Rock and Soil Mechanics,1998,19(3):50-53.
[7]丁自伟,邱华富.破碎围岩巷道新型注浆加固工艺实验研究[J].地下空间与工程学报,2016,12(4):958-962.DING Ziwei,QIU Huafu.Experimental research on new grouting reinforcement technology of roadways with fractured surrounding rock[J].Chinese Journal of Underground Space and Engineering,2016,12(4):958-962.
[8]ISMAIL M A,JOER H A,SIM W H,et al.Effect of cement type on shear behavior of cemented calcareous soil[J].Journal of Geotechnical and Geoenvironmental Engineering,2002,128(6):520-529.
[9]HAERI S M,HAMIDI A,HOSSEINI S M,et al.Effect of cement type on the mechanical behavior of a gravely sand[J].Geotechnical&Geological Engineering,2006,24(2):335-360.
[10]POTYONDY D O,CUNDALL P A.A bond-particle model for rock[J].International Journal of Rock Mechanics&Mining Sciences,2004,41(8):1329-1364.
[11]UTILI S,NOVA R.DEM analysis of bonded granular geomaterials[J].International Journal for Numerical and Analytical Methods in Geomechanics,2008,32(17):1997-2031.
[12]JIANG M J,SUN Y G,XIAO Y.An experimental investigation on the contact behavior between cemented granules[J].Geotechnical and Testing Journal,2012,35(5):678-690.
[13]王旭锋,孙春东,张东升,等.超高水材料充填胶结体工程特性试验研究[J].采矿与安全工程学报,2014,31(6):852-856.WANG Xufeng,SUN Chundong,ZHANG Dongsheng,et al.Experimental study on engineering characteristics of super-high water filling body[J].Journal of Mining&Safety Engineering,2014,31(6):852-856.
[14]蒋明镜,张宁,金树楼.不同胶结宽度粒间胶结特性试验研究[J].岩土力学,2015,36(4):928-936.JIANG Mingjing,ZHANG Ning,JIN Shulou.Experimental study of mechanical behaviors of bonded granules with different bond widths[J].Rock and Soil Mechanics,2015,36(4):928-936.
[15]蒋明镜,周雅萍,陈贺.不同胶结厚度下粒间胶结力学特性的试验研究[J].岩土力学,2013,34(5):1264-1273.JIANG Mingjing,ZHOU Yaping,CHEN He.Experimental study of mechanical behaviors of bonded granules under different bond thicknesses[J].Rock and Soil Mechanics,2013,34(5):1264-1273.
[16]徐鹏,杨圣奇.循环加卸载下煤的黏弹塑性蠕变本构关系研究[J].岩石力学与工程学报,2015,34(3):537-545.XU Peng,YANG Shengqi.Study of visco-elasto-plastic constitutive model of coal under cyclic loading[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(3):537-545.
[17]王煜曦,王金安,唐君.断裂岩石在蠕剪过程中的声发射特征[J].岩石力学与工程学报,2015,34(增刊1):2948-2958.WANG Yuxi,WANG Jin’an,TANG Jun.Acoustic emission characteristics of fractured rocks during creep shear[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(Sup 1):2948-2958.
[18]王金安,李飞,曹秋菊,等.断裂岩石蠕剪中的细观接触损伤试验研究[J].岩土力学,2013,34(12):3345-3352,3383.WANG Jin’an,LI Fei,CAO Qiuju,et al.Experimental study of the meso-contact damage of fractured rocks in creep shear[J].Rock and Soil Mechanics,2013,34(12):3345-3352,3383.
[19]黄明,刘新荣,邓涛.考虑含水劣化的泥质粉砂岩单轴蠕变特性研究[J].福州大学学报(自然科学版),2012,40(3):399-405.HUANG Ming,LIU Xinrong,DENG Tao.Study on the creep properties of T2b2 siltite in terms of the damage law induced by water[J].Journal of Fuzhou University(Natural Science Edition),2012,40(3):399-405.
[20]王更峰,张永兴,熊晓晖,等.深埋大变形隧道炭质板岩蠕变特性试验[J].公路交通科技,2012,29(9):95-102.WANG Gengfeng,ZHANG Yongxing,XIONG Xiaohui,et al.Experiment of creep characteristics of carbonaceous slate of deep-buried tunnel with large deformation[J].Journal of Highway and Transportation Research and Development,2012,29(9):95-102.
[21]赵宝云,刘东燕,郑颖人,等.红砂岩单轴压缩蠕变试验及模型研究[J].采矿与安全工程学报,2013,30(5):744-747.ZHAO Baoyun,LIU Dongyan,ZHENG Yingren,et al.Uniaxial compressive creep test of red sandstone and its constitutive model[J].Journal of Mining&Safety Engineering,2013,30(5):744-747.
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