Improvement in Definition of Joint Parameters in Discontinuous Deformation Analysis
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摘要: 为提高非连续变形分析（discontinuous deformation analysis，DDA）方法程序中节理参数赋值的精度，在DDA原程序节理参数定义的基础上，提出了一种节理参数定义方式的改进方法.首先，根据节理的物理力学性质，对原DDA中节理参数定义存在的非一致性问题进行了分析；其次，由节理参数是由构成节理的两个结构面共同决定的特性，对程序中的节理参数进行了重新定义；最后，对DDA原程序中节理参数赋值部分进行了修改和补充，给出了相应的程序计算流程，并通过块体1和块体2的相对滑动算例对改进后的DDA程序进行了验证.研究结果表明：当块体1和块体2交换力学参数时，其间节理仍为同一性质节理；两种工况下，块体1的速度和位移保持一致，说明改进后的DDA程序能够很好地实现同一节理参数赋值的统一.Abstract: To improve the accuracy of value assignment for the joint parameters in the discontinuous deformation analysis (DDA) program, an improved method for definition of the joint parameters was proposed based on the definition of the joint parameters in the DDA original program. First, according to the physical and mechanical properties of joints, the problem of inconsistency regarding the definition of the joint parameters in the original DDA was analysed. Second, because the joint attribute was determined by the two structural planes of a joint, the joint parameters in the program were redefined. Last, the code for parameter assignment was modified and complemented, and the process flowchart was provided. An example of the relative sliding of two blocks was studied to examine the improved DDA program. The results show that, when the mechanical parameters of blocks 1 and 2 are exchanged, the joints between the two blocks are still joints with the same nature. Under both conditions, the velocity and displacement of Block 1 remain the same. The results also indicate that the improved DDA program can achieve unity of the parameter assignment of the joints.
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图 4 第s2步块体状态(边边接触)
Figure 4. Contact state of blocks in the s2 th step(edge to edge contact)
图 8 原DDA计算的块体n1速度、位移曲线
Figure 8. The velocity and displacement time history curves of block n1 by original DDA
图 9 改进DDA计算的块体n1速度、位移曲线
Figure 9. The velocity and displacement time history curves of block n1 by improved DDA
表 1 节理接触参数定义
Table 1. The definition of joint parameters
节理参数编号 J1 J2 J3 … Jm J1 J1 J12 J13 … J1m J2 J21 J2 J23 … J2m J3 J31 J32 J3 … J3m … Jm Jm1 Jm2 Jm3 … Jmm 
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表 2 块体力学参数
Table 2. The mechanical parameters of blocks
材料编号 重度γ/(kN·m-3) 弹性模量E/GPa 泊松比μ 重力加速度g/(m·s-2) R1 26 60 0.28 10 R2 25 50 0.28 10
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表 3 界面力学参数
Table 3. The mechanical parameters of joints
节理编号 φa/(°) ca/MPa σta/MPa J1 45 0 0 J2 30 0 0 节理编号 φab/(°) cab/MPa σtab/MPa J12 35 0 0
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SHI Genhua. Discontinuous deformation analysis: a new numerical model for the statics and dynamics of block system[D]. Berkeley: University of California, 1988. SITAR N, MACLAUGHLIN M M, DOOLIN D M. Influence of kinematics on landslide mobility and failure mode[J]. Journal of Geotechnical & Geoenvir onmental Engineering, 2005, 131(6):716-728. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=c3254a072e6c0bab84127591c629e419 WU Jianhong. Applying discontinuous deformation analysis to assess the constrained area of the unstable Chiu-fen-erh-shan landslide slope[J]. International Journal for Numerical & Analytic Methods in Geomechanics, 2010, 31(5):649-666. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=057726a8e00e83a339f8f394a004abe1 KVELDSVIK V, EINSTEIN H H, NILSEN B, et al. Numerical analysis of the 650000 m2 Åknes rock slope based on measured displacements and geotechnical data[J]. Rock Mechanics and Rock Engineering, 2009, 42(5):689-728. doi: 10.1007/s00603-008-0005-1 WU Jianhong, CHEN Chunhwa. Application of DDA to simulate characteristics of the Tsaoling landslide[J]. Computers & Geotechnics, 2011, 38(5):741-750. http://www.sciencedirect.com/science/article/pii/S0266352X11000619 ZHANG Yingbin, CHEN Guangqi, ZHENG Lu, et al. Effects of near-fault seismic loadings on run-out of large-scale landslide:a case study[J]. Engineering Geology, 2013, 166(8):216-236. http://www.sciencedirect.com/science/article/pii/S001379521300241X CHEN Guangqi. Numerical modelling of rockfall using extended DDA[J]. Chinese Journal of Rock Mechanics and Engineering, 2003, 22(6):926-931. http://d.wanfangdata.com.cn/Periodical_yslxygcxb200306008.aspx MATSUYAMA H, NISHIYAMA S, OHNISHI Y. Practical studies on rockfall simulation by DDA[J]. Journal of Rock Mechanics and Geotechnical Engineering, 2011, 3(1):57-63. doi: 10.3724/SP.J.1235.2011.00057 CHEN Guangqi, ZHENG Lu, ZHANG Yingbin, et al. Numerical simulation in rockfall analysis:a close comparison of 2-D and 3-D DDA[J]. Rock Mechanics and Rock Engineering, 2013, 46(3):527-41. doi: 10.1007/s00603-012-0360-9 WU Jianhong, OHNISHI Y, NISHIYAMA S. Simulation of the mechanical behavior of inclined jointed rock masses during tunnel construction using discontinuous deformation analysis (DDA)[J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(5):731-743. doi: 10.1016/j.ijrmms.2004.01.010 TSESARSKY M, HATZOR Y. Tunnel roof deflection in blocky rock masses as a function of joint spacing and friction-A parametric study using discontinuous deformation analysis (DDA)[J]. Tunnelling & Underground Space Technology, 2006, 21(1):29-45. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=d219a5fb102c8f14e05c9aeb2d0935e5 NING Youjun, YANG Jun, AN Xinmei, et al. Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method[J]. Frontiers of Structural and Civil Engineering, 2010, 4(2):223-232. http://d.old.wanfangdata.com.cn/Periodical/zggdxxxswz-jzytmgc201002007 NING Youjun, YANG Jun, AN Xinmei, et al. Modelling rock fracturing and blast-induced rock mass failure via advanced discretisation within the discontinuous deformation analysis framework[J]. Computers & Geotechnics, 2011, 38(1):40-49. http://www.sciencedirect.com/science/article/pii/S0266352X10001199 孙东亚, 彭一江, 王兴珍. DDA数值方法在岩质边坡倾倒破坏分析中的应用[J].岩石力学与工程学报, 2002, 121(1):39-42. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb200201008SUN Dongya, PENG Yijiang, WANG Xingzhen. Application of DDA method in stability analysis of topple rock slope[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 121(1):3942. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb200201008 焦玉勇, 张秀丽, 刘泉声, 等.用非连续变形分析方法模拟岩石裂纹扩展[J].岩石力学与工程学报, 2007, 26(4):682-691. doi: 10.3321/j.issn:1000-6915.2007.04.004JIAO Yuyong, ZHANG Xiuli, LIU Quansheng, et al. Simulation of rock crack propagation using discontinuous deformation analysis method[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(4):682-691. doi: 10.3321/j.issn:1000-6915.2007.04.004 夏才初, 许崇帮.非连续变形分析(DDA)中断续节理扩展的模拟方法研究和试验验证[J].岩石力学与工程学报, 2010, 29(10):2027-2033. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb201010010XIA Caichu, XU Chongbang. Atudy of fracturing algorithm of intermitteng joint by DDA and experimental validation[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(10):2027-2033. http://d.old.wanfangdata.com.cn/Periodical/yslxygcxb201010010 WANG Lizhong, JIANG Hongyi, YANG Zhongxuan, et al. Development of discontinuous deformation analysis with displacement-dependent interface shear strength[J]. Computers and Geotechnics. 2013, 47(1):91-101. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=78a2d106c73e6c97c9ad5f7b43b4ffbf ZHANG Yingbin, XU Qiang, CHEN Guangqi, et al. Extension of discontinuous deformation analysis and application in cohesive-frictional slope analysis[J]. International Journal of Rock Mechanics & Mining Sciences, 2014, 70(9):533-545. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=6886d107f52493a64d053cfe0fcbbbd3 马永政, 郑宏, 朱合华, 等. DDA法计算边坡安全系数的黏聚力影响分析[J].岩土工程学报, 2009, 31(7):1088-1093. doi: 10.3321/j.issn:1000-4548.2009.07.016MA Yongzheng, ZHEN Hong, ZHU Hehua, et al. Effect of cohesion on evaluating slope stability factor of safety by DDA method[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(7):1088-1093. doi: 10.3321/j.issn:1000-4548.2009.07.016 JIAO Yuyong, ZHANG Xiuli, ZHAO Jian. Two-dimensional DDA contact constitutive model for simulating rock fragmentation[J]. Journal of Engineering Mechanics, 2011, 138(2):199-209. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=6b983fcd37fef371d412d1b798fa7424 JIAO Yuyong, ZHANG Xiuli, ZHAO Jian. Viscous boundary of DDA for modeling stress wave propagation in jointed rock[J]. International Journal of Rock Mechanics and Mining Sciences, 2007, 44(7):1070-1076. doi: 10.1016/j.ijrmms.2007.03.001 张秀丽, 焦玉勇, 刘泉声, 等.节理对爆炸波传播影响的数值研究[J].岩土力学, 2008, 29(3):717-721. doi: 10.3969/j.issn.1000-7598.2008.03.027ZHANG Xiuli, JIAO Yuyong, LIU Quansheng, et al. Numerical study on effect of joints on blasting wave progation in rock mass[J]. Rock and Soil Mechanics, 2008, 29(3):717-721. doi: 10.3969/j.issn.1000-7598.2008.03.027 BAO Huirong, ZHAO Zhiye. An alternative scheme for the corner-corner contact in the two-dimensional Discontinuous Deformation Analysis[J]. Advances in Engineering Software, 2010, 41(2):206-212. doi: 10.1016/j.advengsoft.2009.09.007 FAN Huo, HE Siming. An angle-based method dealing with vertex-vertex contact in the two-dimensional discontinuous deformation analysis[J]. Rock Mechanics and Rock Engineering, 2015, 48(5):2031-2043. doi: 10.1007/s00603-014-0692-8 -
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