(1. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China；2. Department of mechanics，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；3. School of Architecture and Civil Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China)
Abstract：Spraying cement mortar is often used in the construction of supporting structures in clay rock tunnels. The debonding of the interface may induce serious geology hazards. Taking the cement mortar-clay rock(C-C) binary as the research object，the shear and tension tests of the interface are carried out. Meanwhile，the influence of the initial moisture content of clay rock on the cohesive strength of the binary is analyzed. According to the macroscopic failure mode and microscopic pore characteristics of the binary，a method to determine the thickness of the interfacial influence zone is given. A new numerical model of C-C binary is proposed，which can simulate the effect of the interfacial influence zone. Finally，the debonding process of eccentric compression binary was taken by the new numerical method. The results show that：(1) In shear or tension tests，the failure face of the mortar-clay rock binary is located in clay rock near the interface，which is a weak zone of the binary，namely the interfacial influence zone(IIZ). (2) The shear stiffness Ks and residual friction coefficient k are independent of normal stress and decrease with the increase of water content of clay rock. (3) The infiltration and solidification of cement slurry will cause the swelling and shrink of clay rocks near the interface，which will produce a large number of initial micro-cracks in the interfacial influence zone. Based on the special pore characteristics of the interfacial influence zone，the thickness of the zone can be identified and measured by computer tomography(CT) and digital image processing technology. (4) The new interface cohesive model considers the bonding effect in the normal and tangential direction and the friction of the interface at the same time，which can simulate the stress-displacement relationship of binary accurately. (5) When the interface stays in an eccentric compression state，the debonding load decreases with the increase of the angle between the load and the interface normal. Therefore，the support structure of the eccentric compression tunnel is more prone to debonding.
程树范1，曾亚武1，高 睿1，张慧梅2，陈世官3. 基于剪切和张拉试验的水泥砂浆–黏土岩二元体界面影响区模型[J]. 岩石力学与工程学报, 2023, 42(4): 964-975.
CHENG Shufan1，ZENG Yawu1，GAO Rui1，ZHANG Huimei2，CHEN Shiguan3. An interface influence zone(IIZ) model of cement mortar-clay rock binary#br#
based on shear and tension tests. , 2023, 42(4): 964-975.
[1] 谢和平，陈忠辉，易 成，等. 基于工程体–地质体相互作用的接触面变形破坏研究[J]. 岩石力学与工程学报，2008，27(9)：1 767–1 780.(XIE Heping，CHEN Zhonghui，YI Chen，et al. Research on deformation and failure of interface based on interaction between structural body and geo-body[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(9)：1 767–1 780.(in Chinese))
[2] ZHANG D，UEDA T，FURUUCHI H. Fracture mechanisms of polymer cement mortar：concrete interfaces[J]. Journal of Engineering Mechanics，2013，139(2)：167–176.
[3] 荣 华，王玉珏，赵馨怡，等. 不同粗糙度岩石–混凝土界面断裂特性研究[J]. 工程力学，2019，36(10)：96–103.(RONG Hua，WANG Yujue，ZHAO Xinyi，et al. Research on fracture characteristics of rock-concrete interface with different roughness[J]. Engineering Mechanics，2019，36(10)：96–103.(in Chinese))
[4] MOUZANNAR H，BOST M，LEROUX M，et al. Experimental study of the shear strength of bonded concrete-rock interfaces：surface morphology and scale effect[J]. Rock Mechanics and Rock Engineering，2017，50(10)：2 601–2 625.
[5] CHANG X，LU J，WANG S，et al. Mechanical performances of rock-concrete bi-material disks under diametrical compression[J]. International Journal of Rock Mechanics and Mining Sciences，2018，104：71–77.
[6] TIAN H，CHEN W，YANG D，et al. Experimental and numerical analysis of the shear behaviour of cemented concrete-rock joints[J]. Rock Mechanics and Rock Engineering，2015，48：7 213–7 222.
[7] SHEN Y，WANG Y，YANG Y，et al. Influence of surface roughness and hydrophilicity on bonding strength of concrete-rock interface[J]. Construction and Building Materials，2019，213：7 156–7 166.
[8] OZTURK H，TANNANT D. Influence of rock properties and environment conditions on thin spray-on liner adhesive bond[J]. International Journal of Rock Mechanics and Mining Sciences，2011，48(7)：1 196–1 198.
[9] MALMGREN L，NORDLUND E，ROLUND S. Adhesion strength and shrinkage of shotcrete[J]. Tunnelling and Underground Space Technology. 2005，20(1)：33–48.
[10] 高 睿，邓 畅，蔡 桦，等. 压灌桩桩土接触面微观结构特性模型试验研究[J]. 华中科技大学学报：自然科学版，2021，49(5)：67–73.(GAO Rui，DENG Chang，CAI Hua，et al. Model test study on microstructure characteristics of pile-soil interface of press-grouting pile[J]. Journal of Huazhong University：Natural Science，2021，49(5)：67–73.(in Chinese))
[11] 高 睿，俞 皓，蔡 桦，等. 基于SEM的长螺旋压灌桩水泥浆液渗透规律[J]. 华中科技大学学报：自然科学版，2020，48(6)：101–106.(GAO Rui，YU Hao，CAI Hua，et al. Study on permeability properties of cement slurry for long auger press-grouting pile based on SEM [J]. Journal of Huazhong University：Natural Science，2020，48(6)：101–106.(in Chinese))
[12] 申艳军，张 欢，潘 佳，等. 混凝土界面过渡区微–细观结构识别及形成机制研究进展[J]. 硅酸盐通报，2020，39(10)：3 055–3 069. (SHEN Yanjun，ZHANG Huan，PAN Jia，et al. Research progress on identification and formation mechanism of microstructures in interface transition zone of concrete[J]. Bulletin of The Chinese Ceramic Society，2020，39(10)：3 055–3 069.(in Chinese))
[13] WANG M，XIE Y，LONG G，et al. Microhardness characteristics of high-strength cement paste and interfacial transition zone at different curing regimes[J]. Construction and Building Materials，2019，221：7 151–7 162.
[14] TIAN Y，CHEN C，JIN N，et al. An investigation on the three- dimensional transport of chlorideions in concrete based on X-ray computed tomography technology[J]. Construction and Building Materials，2019，221：7 443–7 455.
[15] HE S，LI Z，YANG E. Quantitative characterization of anisotropic properties of the interfacial transition zone(ITZ) between microfiber and cement paste[J]. Cement and Concrete Research，2019，122：7 136–7 146.
[16] ZHOU Z，SHEN Y，ZHANG H，et al. Sandstone-concrete interface debonding mechanism under freeze-thaw actions：Fracture process and fracture criterion[J]. Construction and Building Materials，2021，294：7123526.
[17] DONG W，WU Z，ZHOU X. Fracture mechanisms of rock-concrete interface：experimental and numerical[J]. Journal of Engineering Mechanics，2016，142(7)：04016040.
[18] DONG W，WU Z，ZHANG B，et al. Study on shear-softening constitutive law of rock-concrete interface[J]. Rock Mechanics and Rock Engineering，2021，54：74 677–74 694.
[19] DONG W，SONG S，ZHANG B，et al. SIF-based fracture criterion of rock-concrete interface and its application to the prediction of cracking paths in gravity dam[J]. Engineering Fracture Mechanics，2019，221：7106686.
[20] KARAMI A，STEAD D. Asperity degradation and damage in the direct shear test：a hybrid FEM/DEM approach[J]. Rock Mechanics and Rock Engineering，2008，41：7 229–7 266.
[21] 张 欢. 冻融对砂岩–混凝土界面过渡区损伤及脱黏演化微观机制分析[硕士学位论文][D]. 西安：西安科技大学，2020.(ZHANG Huan. Sandstone-concrete interface transition zone(1TZ) damage and debonding micro mechanism analysis under freeze-thaw[M. S. Thesis][D]. Xi?an：Xi?an University of Science and Technology，2020.(in Chinese))
[22] 杨俊杰，孙 涛，张玥宸，等. 腐蚀性场地形成的水泥土的劣化研究[J]. 岩土工程学报，2012，34(1)：130–138.(YANG Junjie，SUN Tao，ZHANG Yuechen，et al. Deterioration of soil cement stabilized in corrosive site[J]. Chinese Journal of Geotechnical Engineering，2012，34(1)：130–138.(in Chinese))
[23] 王子帅，王东星. 工业废渣–水泥协同固化土抗硫酸盐侵蚀性能[J]. 岩土工程学报，2022，44(11)：2 035–2 042.(WANG Zishuai，WANG Dongxing. Performance of industrial residue-cement solidified soils in resisting sulfate erosion[J]. Chinese Journal of Geotechnical Engineering，2022，44(11)：2 035–2 042.(in Chinese))
[24] 王 焕. 基于CT图像处理技术的冻融岩石细观损伤研究[硕士学位论文][D]. 西安：西安科技大学，2020.(WANG Huan. Study on mesoscopic damage of freeze-thaw rocks based on CT image processing technology[M. S. Thesis][D]. Xi?an：Xi?an University of Science and Technology，2020.(in Chinese))
[25] WANG Y，LI X，ZHANG B，et al. Meso-damage cracking characteristics analysis for rock and soil aggregate with CT test[J]. Science China：Technological Science，2014，57(7)：1 361–1 371.
[26] WU Z，MA L，FAN L. Investigation of the characteristics of rock fracture process zone using coupled FEM/DEM method[J]. Engineering Fracture Mechanics，2018，200：7 355–7 374.
2023, Vol. 42 
