Finite-discrete element model for slip debonding of cement anchors in clay rock

被引：0
|
作者：
Cheng S. [1 ]
Zeng Y. [1 ]
Gao R. [1 ,2 ]
Zhang J. [3 ]
Qin X. [4 ]
机构：
[1] School of Civil Engineering, Wuhan University, Wuhan
[2] School of Architectural and Civil Engineering, Sanming University, Sanming
[3] Department of Mechanics, Xi'an University of Science and Technology, Xi'an
[4] School of Civil Engineering and Architecture, Xi'an University of Science and Technology, Xi'an
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2023年 / 45卷 / 12期
关键词：
binary interface; bolt (cable) anchor solid; cohesive element; finite-discrete element method; shear dilatancy;
D O I：
10.11779/CJGE20221269
中图分类号：
学科分类号：
摘要：
The bond between an anchor and the surrounding rock is the key factor to ensure the effectiveness of the anchorage system. To study the pull-resistance capacity of cement anchor in clay rock and the debonding mechanism of the interface under pull loads, the triaxial tests on clay rock, the direct shear tests on clay rock-cement mortar (C-C) interface, and the physical model for cement anchor pull-resistance tests are carried out. Based on the finite discrete element method (FDEM), the model for C-C binary is established, and the drawing process of cement anchor is numerically simulated. The researches show that the cohesion of clay rock is less than the tangential bond strength of the C-C interface. The internal tangent of friction angle of clay rock is larger than the friction coefficient of the C-C interface. Therefore, the shear failure of the binary gradually changes from the shear failure of clay rock to the shear debonding of the interface with the increase of the normal pressure. The bilinear cohesive model is available to simulate the failure of clay rock. The bonding interface of the binary is more suitable to be simulated by the bonding-friction model rather than the bilinear cohesive model. The failure process of cement anchor can be divided into four stages: bonding deformation stage, interface debonding stage, shear dilatancy & bite stage, and slip stage. In addition to the interface debonding, the shear failure of clay rock near the anchor is also an important factor leading to anchor failure. The bite force at the shear dilatancy stage determines the peak pull-resistance capacity of the anchor. The research results may play a guiding role in the design of anchorage structures in soft rock areas. © 2023 Chinese Society of Civil Engineering. All rights reserved.
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页码：2594 / 2603
页数：9
相关论文
共 24 条
  • [1] CHENG Liangkui, ZHANG Peiwen, WANG Fan, Several mechanical concepts for anchored structures in rock and soil, Chinese Journal of Rock Mechanics and Engineering, 34, 4, pp. 668-682, (2015)
  • [2] WU Aiqing, HAN Jun, LUO Chaowen, Et al., Research on stress distribution along bolts with single borehole and multiple anchors, Chinese Journal of Rock Mechanics and Engineering, 23, 2, pp. 247-251, (2004)
  • [3] DUAN Jian, YAN Zhixin, GUO Ruijian, Et al., Failure analysis of soil anchors induced by loose interface under pullout load, Chinese Journal of Geotechnical Engineering, 34, 5, pp. 936-941, (2012)
  • [4] OZTURK H, TANNANT D D., Influence of rock properties and environmental conditions on thin spray-on liner adhesive bond, International Journal of Rock Mechanics and Mining Sciences, 48, 7, pp. 1196-1198, (2011)
  • [5] KROUNIS A, JOHANSSON F, LARSSON S., Shear strength of partially bonded concrete-rock interfaces for application in dam stability analyses, Rock Mechanics and Rock Engineering, 49, 7, pp. 2711-2722, (2016)
  • [6] MALMGREN L, NORDLUND E, ROLUND S., Adhesion strength and shrinkage of shotcrete, Tunnelling and Underground Space Technology, 20, 1, pp. 33-48, (2005)
  • [7] SHEN Y J, WANG Y Z, YANG Y, Et al., Influence of surface roughness and hydrophilicity on bonding strength of concrete-rock interface, Construction and Building Materials, 213, pp. 156-166, (2019)
  • [8] DONG W, YANG D, ZHANG B, Et al., Rock-concrete interfacial crack propagation under mixed mode I-II fracture, Journal of Engineering Mechanics, 144, 6, pp. 1943-7889, (2018)
  • [9] DONG W, WU Z M, ZHANG B S, Et al., Study on shear-softening constitutive law of rock-concrete interface, Rock Mechanics and Rock Engineering, 54, 9, pp. 4677-4694, (2021)
  • [10] KiLiC A, YASAR E, CELIK A G., Effect of grout properties on the pull-out load capacity of fully grouted rock bolt, Tunnelling and Underground Space Technology, 17, 4, pp. 355-362, (2002)
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