弱胶结西域砾岩组构特征及其力学性能演化规律研究

doi:10.13722/j.cnki.jrme.2023.0937

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摘要弱胶结西域砾岩在新疆天山南北两麓分布广泛，物质组成复杂，力学性质较差。为科学认识弱胶结西域砾岩力学特性的演化规律，采用室内测试与现场大尺寸真三轴试验方法对西域砾岩的颗粒组构特征与宏观力学特性进行系统研究。研究结果表明：(1) 弱胶结西域砾岩物质组成中碎石、粗砾、中砾3个粒组占比较高，且颗粒级配不良，碎石、砾粒等巨粒、粗粒间接触关系为颗粒悬浮和颗粒支撑结构，颗粒间胶结型式主要为孔隙式胶结；(2) 受颗粒排列特征影响，弱胶结西域砾岩表现出明显的各向异性变形特征，其中铅直方向变形模量最大，颗粒长轴方向(近垂直于天山走向)变形模量最小，中轴方向(近平行于天山走向)变形模量居中，但是随着应力水平提高，弱胶结西域砾岩逐渐趋向于各向同性；(3) 在三轴应力状态下弱胶结西域砾岩在屈服阶段表现出应变硬化特征，当达到峰值后表现出典型的塑性流动特征；(4) 弱胶结西域砾岩的抗剪强度具有明显的非线性特征、加卸载应力路径效应以及中间主应力效应，其中应力水平越高，抗剪强度参数内摩擦角越小，黏聚力越大；卸载条件下西域砾岩的内摩擦角高于加载条件下的内摩擦角，而卸载条件下的黏聚力则低于加载条件下的黏聚力；真三轴加载条件下，其峰值强度随着中间主应力的增加而有所提高，并且中间主应力对抗剪强度参数黏聚力的影响更加明显；(5) 弱胶结西域砾岩在三轴应力状态下的破坏以压剪破坏为主，破坏后形成陡倾的主破裂带，主破裂带之间有拉裂纹连接贯通。试验结果为系统了解弱胶结西域砾岩的宏观力学特性及其演化规律提供了重要依据。

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	范雷
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	张宜虎

关键词 ：岩石力学, 弱胶结西域砾岩, 现场真三轴试验, 颗粒组构, 力学性能, 演化机制

Abstract：The weakly cemented Xiyu conglomerates are widely distributed in the northern and southern foothills of Tianshan Mountains in Xinjiang. The material composition of Xiyu conglomerates is complex，and their mechanical properties are poor. In order to scientifically understand the evolution laws of mechanical properties of weakly cemented Xiyu conglomerate，its grain fabric characteristics and macro mechanical properties were systematically studied by means of laboratory test and in-situ large-scale true triaxial test. The results indicate that：(1) The material composition of weakly cemented Xiyu conglomerate is relatively high in the three particle groups of crushed stones，coarse gravels，and medium gravels. And the particle size distribution of weakly cemented Xiyu conglomerate is poor. The inter-granular contact between large and coarse particles such as crushed stones and gravels involves either particle suspension or particle support. The inter-granular cementation is mainly pore-type cementation. (2) Due to the influence of particle arrangement，weakly cemented Xiyu conglomerates exhibit obvious anisotropic deformation characteristics. The deformation modulus is highest in the vertical direction，lowest in the direction of the particle's major axis(nearly perpendicular to the Tianshan Mountain)，and moderate in the direction of the particle's mid axis(nearly parallel to the Tianshan Mountain). However，with the increase of stress level，the weakly cemented Xiyu conglomerates tend to be isotropic. (3) Under triaxial stress state，weakly cemented Xiyu conglomerate shows strain hardening characteristics in the yield stage. After reaching peak strength，it shows typical plastic flow characteristics. (4) The shear strength of weakly cemented Xiyu conglomerates have obvious nonlinear characteristics，loading and unloading stress path effects and intermediate principal stress effects. The higher the stress level，the smaller the internal friction angle and the greater the cohesion. The internal friction angle of Xiyu conglomerate under unloading condition is higher than that under loading condition，while the cohesion under unloading condition is lower than that under loading condition. Under true triaxial loading，the peak strength increases with the increase of intermediate principal stress，and the effect of the intermediate principal stress on the shear strength parameter，cohesion，is more obvious. (5) The failure of weakly cemented Xiyu conglomerate under triaxial stress is mainly compression-shear failure. After failure，a steep main fracture zone is formed，and the main fracture zones are connected by tensile cracks. The test results provide an important basis for systematically understanding the macro mechanical properties and their evolution laws of the weakly cemented Xiyu conglomerates.

Key words： rock mechanics weakly cemented Xiyu conglomerate in-situ true triaxial test grain fabric mechanical behavior evolution mechanism

引用本文:

范雷，胡伟，张宜虎. 弱胶结西域砾岩组构特征及其力学性能演化规律研究[J]. 岩石力学与工程学报, 2024, 43(8): 1893-1908.
FAN Lei，HU Wei，ZHANG Yihu. Study on the fabric characteristics and evolution mechanism of the mechanical behavior of weakly cemented Xiyu conglomerate. , 2024, 43(8): 1893-1908.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0937 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I8/1893

[2]	陈华慧，林秀伦，关康年，等. 新疆天山地区早更新世沉积及其下限[J]. 第四纪研究，1994，14(1)：38-47.(CHEN Huahui，LIN Xiulun，GUAN Kangnian，et al. Early pleistocene deposits and its lower boundary in Tianshan Mt，Xinjiang region[J]. Quaternary Sciences，1994，14(1)：38-47.(in Chinese))
[4]	陈杰，尹金辉，曲国胜，等. 塔里木盆地西缘西域组的底界、时代、成因与变形过程的初步研究[J]. 地震地质，2000，22(增1)：104-116.(CHEN Jie，YIN Jinhui，QU Guosheng，et al. Timing，lower boundary，genesis and deformation of Xiyu formation around the western margins of the Tarim basin[J]. Seismology and Geology，2000，22(Supp.1)：104-116.(in Chinese))
[7]	王复兴. 新疆奎屯河新龙口水电站弹性抗力系数专题试验研究[R]. 武汉：长江水利委员会长江科学院，2015.(WANG Fuxing. Special experimental study on elastic resistance coefficient of Xinlongkou hydropower station on Kuitun river in Xinjiang[R]. Wuhan：Changjiang River Scientific Research Institute，2015.(in Chinese))
[10]	王传宝. 新疆西域砾岩抗剪强度现场直剪试验研究[J]. 新疆农垦科技，2022，45(3)：64-66.(WANG Chuanbao. In-situ shear tests study on the shear strength of Xiyu conglomerates in Xinjiang region[J]. Xinjiang Agricultural Reclamation Technology，2022，45(3)：64-66.(in Chinese))
[5]	陈杰，HEERMANCE R V，BURBANK D W，等. 中国西南天山西域砾岩的磁性地层年代与地质意义[J]. 第四纪研究，2007，27(4)：576-587.(CHEN Jie，HEERMANCE R V，BURBANK D W，et al. Magnetochronology and its implications of the Xiyu conglomerate in the southwestern Chinese Tianshan foreland[J]. Quaternary Sciences，2007，27(4)：576-587.(in Chinese))
[12]	都里昆•吐尔汗. 西域砾岩水理特性试验研究[J]. 水利建设与管理，2023，43(2)：11-15.(DULIKUN•Tu?erhan. Experimental study on hydrophysical properties of Xiyu conglomerate[J]. Hydraulic Power Construction and Management，2023，43(2)：11-15.(in Chinese))
[14]	ZHANG Q，ZHENG Y N，JIA C J，et al. Investigation of the stability and failure mechanism of slopes in Xiyu conglomerate due to toe erosion[J]. Bulletin of Engineering Geology and the Environment，2023，82(6)：206.
[15]	朱举，乔春生，宋仪，等. 颗粒特性对第三系弱胶结砾岩抗剪强度的影响[J]. 哈尔滨工业大学学报，2019，51(5)：100-109. (ZHU Ju，QIAO Chunshen，SONG Yi，et al. Effect of particle characteristics on shear strength of weakly cemented conglomerate in tertiary[J]. Journal of Harbin Institute of Technology，2019，51(5)：100-109.(in Chinese))
[25]	GARBOCZIA E J，LIU X F，TAYLOR M A. The 3-D shape of blasted and crushed rocks：from 20μm to 38μm[J]. Power Technology，2012，229：84-89.
[45]	XU W J，ZHANG H Y. Meso and macroscale mechanical behaviors of soil-rock mixtures[J]. Acta Geotechnica，2022，17(9)：3 765-3 782.
[3]	滕志宏，岳乐平，蒲仁海，等. 用磁性地层学方法讨论西域组的时代[J]. 地质论评，1996，42(6)：481-489.(TENG Zhihong，YUE Leping，PU Renhai，et al. The magnetostratigraphic age of the Xiyu Formation[J]. Geological Review，1996，42(6)：481-489.(in Chinese))
[13]	都里昆•吐尔汗. 西域砾岩力学特性原位试验研究[J]. 水利建设与管理，2023，43(4)：14-20.(DULIKUN•Tu?erhan. In-situ test study on the mechanical properties of conglomerate in western regions[J]. Hydraulic Power Construction and Management，2023，43(4)：14- 20.(in Chinese))
[23]	CASAGLI N，ERMINI L，ROSATI G. Deterring grain size distribution of the material composing landslide dams in the Northern Apennines：Sampling and processing methods[J]. Engineering Geology，2003，69(1/2)：83-97.
[33]	DINE B S E，DUPLA J C，FRANK R，et al. Mechanical characterization of matrix coarse grained soils with a large-sized triaxial device[J]. Canadian Geotechnical Journal，2010，47(4)：425-438.
[43]	WANG S N，LI Y，GAO X Q，et al. Influence of volumetric block proportion on mechanical properties of virtual soil-rock mixtures[J]. Engineering Geology，2020，278：105850.
[1]	黄汲清，陈炳蔚. 特提斯-喜马拉雅构造域上新世-第四纪磨拉石的形成及其与印度板块活动的关系[C]// 国际交流地质学术论文集(1) 构造地质地质力学. 北京：地质出版社，1980：1-14.(HUANG Jiqing，CHEN Bingwei. The formation of upper Pliocene-Quaternary Molasse in Tethys-Himalayan tectonic domain and its relationship with India plate activity[C]// International Symposium on Analytical Geology(1) Structural Geology Geomechanics. Beijing：Geological Press，1980：1-14.(in Chinese))
[11]	王传宝. 新疆西域砾岩组构特征及物理特性研究[J]. 甘肃水利水电技术，2022，58(3)：48-52.(WANG Chuanbao. Study on the fabric characteristics and physical characteristics of Xiyu conglomerates in Xinjiang region[J]. Gansu Water Resources and Hydropower Technology，2022，58(3)：48-52.(in Chinese))
[21]	WEI J，LIAO H L，HUANG B，et al. Effect of the random distribution of gravel particles on the mechanical behaviors of conglomerate[J]. Arabian Journal of Geosciences，2023，16(8)：485.
[31]	李长圣，张丹，王宏宪，等. 基于CT扫描的土石混合体三维数值网格的建立[J]. 岩土力学，2014，35(9)：2 731-2 736.(LI Changsheng，ZHANG Dan，WANG Hongxian，et al. 3D mesh generation for soil-rock mixture based on CT scanning[J]. Rock and Soil Mechanics，2014，35(9)：2 731-2 736.(in Chinese))
[41]	刘新荣，涂义亮，王林枫，等. 土石混合体的剪切面分形特征及强度产生机制[J]. 岩石力学与工程学报，2017，36(9)：2 260-2 274. (LIU Xinrong，TU Yiliang，WANG Linfeng，et al. Fractal characteristics of shear failure surface and mechanism of strength generation of soil-rock aggregate[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(9)：2 260-2 274.(in Chinese))
[6]	闰建玲，于为. 对新疆某水电站西域砾岩变形特性的探讨[J]. 资源环境与工程，2016，30(3)：361-363.(YAN Jianling，YU Wei. Discussion on deformation characteristics of western conglomerate in a Hydropower Station，Xinjiang Province[J]. Resources Environment and Engineering，2016，30(3)：361-363.(in Chinese))
[24]	LANARO F，TOLPPANEN P. 3D characterization of coarse aggregate[J]. Engineering Geology，2002，65(1)：17-30.
[35]	AFIFIPOUR M，MOAREFVAND P. Mechanical behavior of bimrocks having high rock block proportion[J]. International Journal of Rock Mechanics and Mining Sciences，2014，65：40-48.
[42]	胡瑞林，李晓，王宇，等. 土石混合体工程地质力学特性及其结构效应研究[J]. 工程地质学报，2020，28(2)：255-281.(HU Ruilin，LI Xiao，WANG Yu，et al. Research on engineering geomechanics and structural effect of soil-rock mixture[J]. Journal of Engineering Geology，2020，28(2)：255-281.(in Chinese))
[8]	范雷，张宜虎，陈冲，等. 弱胶结西域砾岩引水隧洞围岩抗力特性试验研究[J]. 岩土力学，2019，40(8)：2 982-2 988.(FAN Lei，ZHANG Yihu，CHEN Chong，et al. Experimental research on resistance characteristics of weakly cemented Xiyu conglomerate diversion tunnel surrounding rock[J]. Rock and Soil Mechanics，2019，40(8)：2 982-2 988.(in Chinese))
[9]	李文新，王玉杰，王兆云，等. 西域砾岩宏观地质特性与分类方法[J]. 水利水电技术：中英文，2022，53(增2)：394-398.(LI Wenxin，WANG Yujie，WANG Zhaoyun，et al. Geological characteristics and classification methods of Xiyu conglomerates[J]. Water Resources and Hydropower Engineering，2022，53(Supp.2)：394-398.(in Chinese))
[18]	宋朝阳，宁方波. 弱胶结类岩石细观结构参数与其宏观力学行为的关联性研究进展[J]. 金属矿山，2018，(12)：1-9.(SONG Zhaoyang，NING Fangbo. Progress on the association between mesostructural parameters and macromechanical behaviors of weakly cemented rocks[J]. Metal Mine，2018，(12)：1-9.(in Chinese))
[19]	AKRAM M S，SHARROCK G B，MITRA R. Investigating mechanics of conglomeratic rocks：influence of clast size distribution，scale and properties of clast and interparticle cement[J]. Bulletin of Engineering Geology and the Environment，2019，78(4)：2 769-2 788.
[28]	XU W J，YUE Z Q，HU R L. Study on the mesostructure and mesomechanical characteristics of the soil-rock mixture using digital image processing based ?nite element method[J]. International Journal of Rock Mechanics and Mining Sciences，2008，45(5)：749-762.
[29]	XU W J，XU Q，HU R L. Study on the shear strength of soil-rock mixture by large scale direct shear test[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(8)：1 235-1 247.
[38]	范永波，李世海，侯岳峰，等. 不同边界条件下土石混合体破坏机制研究[J]. 水文地质工程地质，2013，40(3)：48-51.(FAN Yongbo，LI Shihai，HOU Yuefeng，et al. A study of the failure mechanism of rock and soil associate under different boundary conditions[J]. Hydrogeology and Engineering Geology，2013，40(3)：48-51.(in Chinese))
[39]	夏加国，胡瑞林，祁生文，等. 含超径颗粒土石混合体的大型三轴剪切试验研究[J]. 岩石力学与工程学报，2017，36(8)：2 031-2 039. (XIA Jiaguo，HU Ruilin，QI Shengwen，et al. Large-scale triaxial shear testing of soil rock mixtures containing oversized particles[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(8)：2 031- 2 039.(in Chinese))
[16]	FU X D，DU Y X，SHENG Q. Geo?engineering descriptions and damage characteristics assessment for Xigeda formation，Yunnan Province，China[J]. Environmental Earth Sciences，2021，80(19)：670.
[17]	FU X D，DU Y X，SHENG Q，et al. Influences of water on the microstructure and mechanical behavior of the Xigeda formation[J]. Bulletin of Engineering Geology and the Environment，2022，81(1)：72.
[20]	WANG J B，GE H K，LIU J T，et al. Effects of gravel size and content on the mechanical properties of conglomerate[J]. Rock Mechanics and Rock Engineering，2022，55(4)：2 493-2 502.
[22]	LI J R，DUAN K，MENG H，et al. On the mechanical properties and failure mechanism of conglomerate specimens subjected to triaxial compression tests[J]. Rock Mechanics and Rock Engineering，2023，56(2)：973-995.
[26]	廖秋林，李晓，朱万成，等. 基于数码图像土石混合体结构建模及其力学结构效应的数值分析[J]. 岩石力学与工程学报，2010，29(1)：155-162.(LIAO Qiulin，LI Xiao，ZHU Wancheng，et al. Structure model construction of rock and soil aggregate based on digital image technology and its numerical simulation on mechanical structure effects[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：155-162.(in Chinese))
[27]	张亚南，冯春，李世海. 采用波动方法探测土石混合体结构特性的可行性研究[J]. 岩石力学与工程学报，2011，30(9)：1 855-1 863. (ZHANG Yanan，FENG Chun，LI Shihai. Feasibility study of wave method for detecting structural properties of soil-rock mixtures[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(9)： 1 855-1 863.(in Chinese))
[30]	徐文杰，许强. 岩土材料细观结构定量化表述方法研究——以土石混合体为例[J]. 岩石力学与工程学报，2012，31(3)：499-506. (XU Wenjie，XU Qiang. Study of quantitative description methods of geomaterial meso-structure—taking soil rock mixture for example[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(3)：499-506.(in Chinese))
[32]	BAGHERZADEH-KHALKHALI A，MIRGHASEMI A A. Numerical and experimental direct shear tests for coarse grained soils[J]. Particuology，2009，7(1)：83-91.
[34]	HAM T G，NAKATA Y，ORENSE R P，et al. Influence of gravel on the compression characteristics of decomposed granite soil[J]. Journal of Geotechnical and Geoenvironmental Engineering，2010，136(11)：1 574-1 577.
[36]	SONMEZ H，ERCANOGLU M，KALEDER A，et al. Predicting uniaxial compressive strength and deformation modulus of volcanic bimrock considering engineering dimension[J]. International Journal of Rock Mechanics and Mining Sciences，2016，86：91-103.
[37]	李晓，廖秋林，赫建明，等. 土石混合体力学特性的原位试验研究[J]. 岩石力学与工程学报，2007，26(12)：2 377-2 384.(LI Xiao，LIAO Qiulin，HE Jianming，et al. Study on in-situ tests of mechanical characteristics on soil-rock aggregate[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(12)：2 377-2 384.(in Chinese))
[40]	JIN L，ZENG Y W，XIA L，et al. Experimental and numerical investigation of mechanical behaviors of cemented soil-rock mixture[J]. Geotechnical and Geological Engineering，2017，35(1)：337-354.
[44]	XU W J，ZHANG H Y. Research on the effect of rock content and sample size on the strength behavior of soil-rock mixture[J]. Bulletin of Engineering Geology and the Environment，2021，80(3)：2 715- 2 726.
[46]	中华人民共和国国家标准编写组. GB/T 50145—2007土的工程分类标准[S]. 北京：中国计划出版社，2008.(The National Standards Compilation Group of People?s Republic of China. GB/T 50145—2007 Standard for engineering classification of soil[S]. Beijing：China Planning Press，2008.(in Chinese))