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| Study on water sensitivity effect and mechanical damage characteristics of Xiyu conglomerate under complex water environment and stress condition |
| DUAN Xuelei1，2，ZHANG Qiang3，CAO Yajun1，2，ZHAO Dengfeng 4，WANG Wei1，2，ZHU Qizhi1，2，LIU Shifan1，2 |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210024，China；2. Institute of Geotechnical Engineering，Hohai University，Nanjing，Jiangsu 210024，China； 3. Institute of Geotechnical Engineering，China Institute of Water Resources and Hydropower Research，Beijing 100038，China；
4. Momoke Water Conservancy Project Construction Management Bureau，Kashgar，Xinjiang 844900，China) |
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Abstract To investigate the water sensitivity effect and mechanical damage evolution of Xiyu conglomerate subjected to complex water environment and stress state，adopting the rock multi-field coupled triaxial servo automatic testing system，a series of uniaxial compression tests under varying water contents，and triaxial compression tests under varying pore and confining pressures were carried out. The effects of water content，pore pressure and stress state on the strength，deformation parameters，damage characteristics and failure mode were analyzed. The results show that Xiyu conglomerate in Kashgar，Xinjiang has the characteristics of low mechanical strength，high deformability，low porosity and strong water sensitivity. An increase of water content results in the decrease of elastic modulus，deformation modulus and characteristic stresses of Xiyu conglomerate，and its peak strength?s softening coefficient is around 0.77. The nonlinear deformation of Xiyu conglomerate is significantly impacted by confining and pore pressures，exhibiting robust ductility mechanical behavior at elevated levels of these pressures. Compared with other strength criteria，Drucker-Prager criterion can accurately describe the evolution of mechanical properties for Xiyu conglomerate，and the damage is analyzed based on crack volume strain. In the dry natural state，the failure modes of Xiyu conglomerate are mainly tensile and fracturing failure，while in the saturated state，tensile and shear mixed failure will occur. With increasing pore and confining pressures，the macroscopic failure mode is mainly shear failure，and its shear failure angle decreases.
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| Cite this article: |
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DUAN Xuelei1,2,ZHANG Qiang3, et al. Study on water sensitivity effect and mechanical damage characteristics of Xiyu conglomerate under complex water environment and stress condition[J]. , 2024, 43(12): 2992-3004.
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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/2992 |
| [1] 黄汲清，杨仲健，程浴淇，等. 新疆油田地质调查报告[R]. 南京：南京出版社，1947.(HUANG Jiqing，YANG Zhongjian，CHENG Yuqi，et al. Geological survey report of Xinjiang oilfield[R]. Nanjing：Nanjing Press，1947.(in Chinese))
[2] 李文新. 西域砾岩工程特性及筑坝工程实践[M]. 北京：中国水利水电出版社，2023：13–18.(LI Wenxin. Xiyu conglomerate Engineering characteristics and dam construction engineering practice[M]. Beijing：China Water Power Press，2023：13–18.(in Chinese))
[3] ZHANG Q，ZHENG Y，JIA C，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.
[4] 陈兴周，白亚妮，陈莉丽，等. 高渗压与循环加卸载环境下开挖卸荷岩体力学特性试验研究[J]. 岩土工程学报，2024，46(4)：737–745.(CHEN Xingzhou，BAI Yani，CHEN Lili，et al. Experimental study on mechanical properties of excavated unloading rock mass under high osmotic pressure and cyclic loading and unloading environments[J]. Chinese Journal of Geotechnical Engineering，2024，46(4)：737–745. (in Chinese))
[5] YANG S Q，JING H W，CHENG L. Influences of pore pressure on short-term and creep mechanical behavior of red sandstone[J]. Engineering Geology，2014，179：10–23.
[6] 王 伟，陈 曦，田振元，等. 不同排水条件下砂岩应力渗流耦合试验研究[J]. 岩石力学与工程学报，2016，35(增2)：3 540–3 551. (WANG Wei，CHEN Xi，TIAN Zhenyuan，et al. Experimental study on stress-seepage coupling properties of sandstone under different drainage conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(Supp.2)：3 540–3 551.(in Chinese))
[7] 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))
[8] WANG J，GE H，LIU J，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.
[9] 吴海光，康 逊，秦明阳，等. 准噶尔盆地玛湖凹陷百口泉组砂砾岩非均质储层孔隙结构特征与成因[J]. 中南大学学报：自然科学版，2022，53(9)：3 337–3 353.(WU Haiguang，KANG Xun，QIN Mingyang，et al. Pore structure characteristics and genesis of heterogeneous conglomerate reservoir of Baikouquan Formation in Mahusag，Junggar Basin[J]. Journal of Central South University：Science and Technology，2022，53(9)：3 337–3 353.(in Chinese))
[10] 马东东，罗宇杰，胡大伟，等. 粒径分选性与围压对砂砾岩水力压裂破裂影响机制研究[J]. 岩石力学与工程学报，2020，39(11)：2 264–2 273.(MA Dongdong，LUO Yujie，HU Dawei，et al. Effects of particle size sorting and confining pressure on hydraulic fracturing mechanism of glutenite rock[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(11)：2 264–2 273.(in Chinese))
[11] 田巍巍，陈 洁，吴 彬. 西域组钙质胶结砾岩物质构成试验研究[J]. 水利水电技术，2018，49(12)：185–193.(TIAN Weiwei，CHEN Jie，WU Bin. Experimental study on material composition of Xiyu Formation calcareous cementitious conglomerate[J]. Water Resources and Hydropower Engineering，2018，49(12)：185–193.(in Chinese))
[12] 张兆鹏，张士诚，石善志，等. 基于纳米压痕实验和均匀化方法评价砾岩多尺度力学性质——以玛湖凹陷南斜坡致密砾岩储层为例[J]. 岩石力学与工程学报，2022，41(5)：926–940.(ZHANG Zhaopeng，ZHANG Shicheng，SHI Shanzhi，et al. Evaluation of multi-scale mechanical properties of conglomerate using nanoindentation and homogenization methods：A case study on tight conglomerate reservoirs in southern slope of Mahu sag[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(5)：926–940.(in Chinese))
[13] ERGULER Z A，ULUSAY R. Water-induced variations in mechanical properties of clay-bearing rocks[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(2)：355–370.
[14] 贾海梁，王 婷，项 伟，等. 含水率对泥质粉砂岩物理力学性质影响的规律与机制[J]. 岩石力学与工程学报，2018，37(7)：1 618–1 628.(JIA Hailiang，WANG Ting，XIANG Wei，et al. Influence of water content on the physical and mechanical behaviour of argillaceous siltstone and some microscopic explanations[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(7)：1 618–1 628.(in Chinese))
[15] 陈国庆，简大华，陈宇航，等. 不同含水率冻融后红砂岩剪切蠕变特性[J]. 岩土工程学报，2021，43(4)：661–669.(CHEN Guoqing，JIAN Dahua，CHEN Yuhang，et al. Shear creep characteristics of red sandstone after freeze-thaw with different water content[J]. Chinese Journal of Geotechnical Engineering，2021，43(4)：661–669.(in Chinese))
[16] ITO T. Effect of pore pressure gradient on fracture initiation in fluid saturated porous media：rock[J]. Engineering Fracture Mechanics，2008，75(7)：1 753–1 762.
[17] 李尤嘉，黄醒春，邱一平，等. 含水状态下膏溶角砾岩破裂全程的细观力学试验研究[J]. 岩土力学，2009，30(5)：1 221–1 225.(LI Youjia，HUANG Xingchun，QIU Yiping，et al. Meso-mechanical testing study of microfracturing process property of gypsum breccia under condition of water damage[J]. Rock and Soil Mechanics，2009，30(5)：1 221–1 225.(in Chinese))
[18] 李帅军，冯夏庭，徐鼎平，等. 天然和饱水状态B类角砾岩的力学性质及其对地下厂房稳定性的影响[J]. 岩石力学与工程学报，2016，35(8)：1 530–1 542.(LI Shuaijun，FENG Xiating，XU Dingping，et al. Mechanical property of B-type breccia under both natural and saturated state and its influence on the stability of underground powerhouse[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(8)：1 530–1 542.(in Chinese))
[19] VASARHELYI B，VáN P. Influence of water content on the strength of rock[J]. Engineering Geology，2006，84(1/2)：70–74.
[20] LIU B L，YANG H Q，KAREKAL S. Effect of water content on argillization of mudstone during the tunnelling process[J]. Rock Mechanics and Rock Engineering，2020，53(2)：799–813.
[21] 彭守建，谭 虎，许 江，等. 不同孔隙水压条件下完整砂岩剪切力学特性试验研究[J]. 岩石力学与工程学报，2017，36(增1)：3 131–3 139.(PENG Shoujian，TAN Hu，XU Jiang，et al. Experimental study on shear mechanical properties of complete sandstone under different pore water pressures[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.1)：3 131–3 139.(in Chinese))
[22] MARTIN C D，CHANDLER N A. The progressive fracture of lac du bonnet granite[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1994，31(6)：643–659.
[23] WANG X，WEN D，DING H，et al. Experimental study on damage behavior of porous coral limestone from the Zhongsha Islands，South China Sea[J]. Rock Mechanics and Rock Engineering，2023，56(5)：3 787–3 803.
[24] 周 辉，宋 明，张传庆，等. 三轴应力下水对泥质砂岩力学特性影响的试验研究[J]. 岩土力学，2022，43(9)：2 391–2 398.(ZHOU Hui，SONG Ming，ZHANG Chuanqing，et al. Experimental study of influences of water on mechanical behaviors of argillaceous sandstone under tri-axial compression[J]. Rock and Soil Mechanics，2022，43(9)：2 391–2 398.(in Chinese))
[25] 王 伟，李雪浩，胡大伟，等. 脆性岩石三轴压缩渐裂过程中的渗透性演化规律研究[J]. 岩土力学，2016，37(10)：2 761–2 768. (WANG Wei，LI Xuehao，HU Dawei，et al. Permeability evolution of brittle rock in progressive failure process under triaxial compression[J]. Rock and Soil Mechanics，2016，37(10)：2 761–2 768.(in Chinese))
[26] 谢和平，陈忠辉. 岩石力学[M]. 北京：科学出版社，2004：45–49. (XIE Heping，CHEN Zhonghui. Rock mechanics[M]. Beijing：Science Press，2004：45–49.(in Chinese))
[27] XIAO W J，ZHANG D M，WANG X J. Experimental study on progressive failure process and permeability characteristics of red sandstone under seepage pressure[J]. Engineering Geology，2020，265：105406.
[28] WANG W，DUAN X L，JIA Y，et al. Damage evolution of sandstone based on acoustic emission under different seepage conditions[J]. European Journal of Environmental and Civil Engineering，2022，27(4)：1 796–1 812. |
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2024, Vol. 43 
