加锚异质岩层压剪脱黏破坏及锚固失效机理分析
Analysis of de-bonding and failure mechanism of anchored composite strata under compression shear load
-
摘要: 针对异质岩层锚固失效，基于锚杆双线性强化本构模型，考虑黏结层拉压刚度劣化，构建了异质岩层-黏结层-锚杆锚固系统的三维精细化数值计算模型，分析了花岗岩-花岗岩、花岗岩-砂岩、砂岩-花岗岩、砂岩-砂岩4类不同岩性组合下锚杆应力传递规律以及锚固系统的变形破坏特征，揭示了不同岩性组合对加锚复合岩层剪切力学特性的影响规律。结果表明：压剪状态下穿层锚杆层理面局部区域为抗剪主体，层理面附近存在最大切应力；锚杆正应力的峰值与锚杆的穿层顺序有关；在同一边界条件下，锚杆限制同质硬岩的剪切移动效果最好；层理面附近锚固系统易发生脱黏破坏，黏结层刚度折减率大的位置总位于软岩部分。Abstract: Aiming at the anchoring failure of heterogeneous rock strata, based on bolt bilinear strengthening constitutive model and considering the deterioration of tension and compression stiffness of bonded layer, a three-dimensional refined numerical calculation model of heterogeneous rock strata, bonded layer and bolt anchoring system was constructed. The stress transfer law of anchor bolt and deformation and failure characteristics of anchor system under granite-granite(H-H), granite-sandstone(H-S), sandstone-granite(S-H) and sandstone-sandstone(S-S) rock combinations were analyzed, and the influence law of different lithologic combinations on shear mechanical properties of anchor composite rock strata was revealed. The results show that the shear resistance is mainly in the local area of the bedding surface under compression shear state, and the maximum shear stress exists near the bedding surface. The peak value of bolt normal stress is related to the sequence of bolt penetration. Under the same boundary condition, the effect of rock bolt limiting shear movement of homogeneous hard rock is the best. The anchorage system near the bedding surface is prone to de-bonding failure and the position with large reduction rate of the stiffness of the bonded layer is always located in the soft rock part.
-
-
[1] 马其华，姜斌，许文龙，等．复合顶板巷道围岩控制技术研究[J]．煤炭工程，2016，48（5）：47－49. MA Qihua, JIANG Bin, XU Wenlong, et al. Study on surrounding rock control technology of composite roof roadway[J]. Coal Engineering, 2016, 48（5）: 47-49.
[2] 毛建新，佟晶洁，韩景利．锚杆支护在煤岩复合顶板大跨度巷道中的应用[J]．煤矿安全，2002，33（8）：28. [3] 柏建彪，侯朝炯，杜木民，等．复合顶板极软煤层巷道锚杆支护技术研究[J]．岩石力学与工程学报，2001， 20（1）：53－56. BO Jianbiao, HOU Chaojiong, DU Mumin, et al. On bolting support of roadway in extremely soft seam of coal mine with complex roof[J]. Chinese Journal of Rock Mechanics and Engineering, 2001, 20（1）: 53-56.
[4] 伍国军，陈卫忠，杨建平，等．基于软弱夹层损伤破坏模型的软岩巷道支护优化研究[J]．岩石力学与工程学报，2011，30（Ｓ2）：4129－4135. WU Guojun, CHEN Weizhong, YANG Jianping, et al. Support optimization of soft rock roadways based on danage constitutive model for weak intercalated layers[J].Chinese Journal of Rock Mechanics and Engineering, 2011, 30（Ｓ2）: 4129-4135.
[5] 轩召军，常庆粮，施现院，等．深埋大跨度复合顶板煤巷失稳机理及控制技术[J]．煤矿安全，2019，50（1）：170－174. XUAN Zhaojun, CHANG Qingliang, SHI Xianyuan, et al. Mechanism of instability and control technology of deep-buried large-span coal roadway under composite roof[J]. Safety in Coal Mines, 2019, 50（1）: 170-174.
[6] 刘波，陶龙光，李先炜，等．锚杆拉剪大变形应变分析[J]．岩石力学与工程报，2000，19（3）：334－338. LIU Bo, TAO Longguang, LI Xianwei, et al. Analysis on bolt strain with large deformation under shearing tensile load[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19（3）: 334-338.
[7] 刘波，李先炜，陶龙光．锚拉支架中锚杆横向效应分析[J]．岩土工程学报，1998，20（4）：36-39. LIU Bo, LI Xianwei, TAO Longguang, et al. Analysis on lateral behavior of bolts in roof truss system[J]. Chinese Journal of Geotechnical Engineering,1988, 20（4）: 39-42.
[8] 关玉祥,朱阳涛.复合顶板托顶煤巷道锚喷注联合控制技术[J].陕西煤炭,2021,40(4):98-102. GUAN Yuxiang, ZHU Yangtao. Combined control technology of bolting, shotcreting and grouting in coal roadway with composite roof[J]. Shaanxi Coal, 2021, 40（4）: 98-102.
[9] 耿献文,谭云亮.复合顶板采动影响煤层巷道锚杆支护技术[J]．有色金属（矿山部分），2004，56（6）：25. GENG Xianwen, TAN Yunliang. Bolt support technology of coal seam roadway affected by mining of composite roof[J]. Nonferrous Metals （Ｍｉｎｉｎｇ Ｓｅｃｔｉｏｎ）, 2004, 56（6）: 25-26.
[10] 李育宗，刘才华．拉剪作用下节理岩体锚固力学分析模型[J]．岩石力学与工程学报，2016，35（12）：2471. LI Yuzong，LIU Caihua. An analytical model of jointed rock bolts under the combination of tensile and shear loads[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35（12）: 2471-2478.
[11] 陈虎,叶义成,胡南燕,等．复合顶板锚杆受力特征及临界长度研究[J]．采矿与安全工程学报，2020，37（6）：1162－1170. CHEN Hu, YE Yicheng, HU Nanyan, et al. Stress characteristics and critical length of bolt in composite roof[J]. Journal of Mining & Safety Engineering, 2020, 37（6）: 1162-1170.
[12] 杨峰.复合顶板动压巷道变形破坏机理与锚杆支护技术研究[D].青岛：山东科技大学,2006. [13] 杨峰,王连国,贺安民，等.复合顶板的破坏机理与锚杆支护技术[J]．采矿与安全工程学报，2008，25（3）：286－289. YANG Feng, WANG Lianguo, HE Anmin, et al. Failure mechanism and bolting support technique of complex roof[J]. Journal of Mining & Safety Engineering, 2008, 25（3）: 286-289.
[14] ZHAO Zenghui, GAO Xiaojie, TAN Yunliang, et al. Theoretical and numerical study on reinforcing effect of rock-bolt through composite soft rockmass[J]. Journal of Central South University, 2018, 25（10）: 2512-2522. [15] Zhao Z H, Sun W, Chen S J, et al. Coupling model of jointed rock mass and rock bolt in offshore LPG underground storage[J]. Energy Science & Engineering, 2020, 8（5）: 1468-1483. [16] Wu X Z, Jiang Y J, Li B. Influence of joint roughness on the shear behaviour of fully encapsulated rock bolt[J]. Rock Mechanics and Rock Engineering, 2018, 51（3）: 953-959. [17] 刘安秀,曹朋,陈斌.典型锚杆支护巷道含软弱夹层顶板组合梁模型新研究[J]．矿业安全与环保，2011，38（5）：74－76. [18] 刘泉声,雷广峰,彭星新,等.白砂岩、大理岩及花岗岩加锚剪切力学特性研究[J].岩石力学与工程学报,2018, 37（Ｓ2）: 4007-4015. LIU Quansheng, LEI Guangfeng, PENG Xingxin, et al. Study on shear mechanical properties of sandstone，marble and granite after anchoring[J]. Chinese Journal of Rock Mechanics and Engineering, 2018, 37（Ｓ2）:4007-4015.
[19] 张伟,刘泉声.基于剪切试验的预应力锚杆变形性能分析[J]．岩土力学，2014，35（8）：2231－2240. ZHANG Wei, LIU Quansheng. Analysis of deformation characteristics of pre-stressed anchor bolt based on shear test[J]. Rock and Soil Mechanics, 2014, 35（8）:2231-2240.
[20] Yu C L, Teng J Y, et al. Experimental study and stress analysis of rock bolt anchorage performance[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2014, 6（5）: 428-437. [21] Lin H, Xiong Z, Liu T, et al. Numerical simulations of the effect of bolt inclination on the shear strength of rock joints[J]. International Journal of Rock Mechanics & Mining Sciences, 2014, 66: 49-56. [22] 李超,弓培林.复合岩层锚杆预应力扩散规律研究及应用[J].煤炭工程，2019，51（7）：89－92. LI Chao, GONG Peilin. Study on prestress bolt diffusion mechanism and application of composite rock[J].Coal Engineering, 2019, 51（7）: 89- 92.
[23] Jalalifar H, Aziz N. Experimental and 3D numerical simulation of reinforced shear joints[J]. Rock Mecha-nics and Rock Engineering, 2010, 43（1）: 95-103. [24] 何栋梁，杨伟军，林杭，等.锚固节理直剪力学行为的颗粒流数值分析[J].工程地质学报，2019，27（2）：302-310. HE Dongliang, YANG Weijun, LIN Hang, et al. Numerical analysis for direct shear test of bolted joint based on particle flow code[J]. Journal of Engineering Geology, 2017, 27（2）: 302-310.
[25] 费康，张建伟．ＡＢＡＱＵＳ在岩土工程中的应用[Ｍ]．北京：中国水利水电出版社，2010: 150－165. [26] Hibbitte K, Soorenson. ABAQUS/Standard user’s manual[S]. USA, 2002.
计量
- 文章访问数: 27
- HTML全文浏览量: 0
- PDF下载量: 8
下载:
