|
|
|
| STUDY OF FIELD MONITORING AND DAMAGE MECHANICS ANALYSIS OF BRITTLE FRACTURED ROCK MASSES |
(1. Research Center of Geotechnical and Structural Engineering，Shandong University，Jinan，Shandong 250061，China；
2. Sany Group，Beijing 100055，China) |
|
|
|
|
Abstract Many hydropower stations in Southwest China are located in regions with high geostresse or brittle rock masses. Deep fracture zones occur often in the sidewalls of the underground caverns. The theory and method of fracture and damage mechanics are adopted to study this phenomenon. This model can take into account area and orientation of fractured surfaces of multiple joint sets，as well as spacing and density of joints. Under the assumption of equivalent strain principle，a damage constitutive model is established based on Mohr-Coulomb criterion. The theory of fracture mechanics is applied to analyze the occurrence of secondary cracks during cavern excavation. The failure criterion for rock bridge coalescence and damage evolution equation are derived. A new subprogram for the above-mentioned damage constitutive model and damage evolution equation is developed. The program is then applied to stability analysis of an underground cavern group of a hydropower station. The results are compared with the depth of the relaxation and fracture zone in surrounding rock obtained from field monitoring. The distribution of splitting zone obtained from the proposed model is consistent with the field monitoring data. Therefore，the proposed model is validated.
|
|
Received: 13 May 2010
|
|
|
|
| [1] HIBINO S，MOTORMAN M. Characteristic behavior of rock mass during excavation of large caverns[C]// Proceedings of 8th International Congress on Rock Mechanics. Tokyo，Japan：[s. n.]，1995：583–586.
[2] FRANTZISKONIS G，DESAL C S. Constitutive model with strain softening[J]. International Journal of Solids and Structures，1987，23(6)：733–750.
[3] KAWAMOTO T. Deformation and fracturing behaviour of discontinuous rock mass and damage mechanics theory[J]. International Journal for Numerical and Analytical Methods in Geomechanics，1988，12(1)：1–30.
[4] MURAKAMI S. Anisotropic aspects of material damage and application of continuum damage mechanics[C]// Proceedings of CISM Courses and Lectures No. 295. New York：Springer-Verlay，1987：91–134.
[5] ZHANG W H，VALLIAPPAN S. Analysis of random anisotropic damage. mechanics problems of rock mass, part I—probabilistic simulation[J]. Rock Mechanics and Rock Engineering，1991，23(2)：91–112.
[6] ZHANG W H，VALLIAPPAN S. Analysis of random anisotropic damage mechanics problems of rock mass，part II—statistical estimation[J]. Rock Mechanics and Rock Engineering，1991，23(2)：241–259.
[7] 朱维申，李新平. 多裂隙岩体的等效弹性损伤模型及有限元分析[C]// 第四届全国岩土力学数值分析与解析方法讨论会论文集. 武汉：武汉测绘科技大学出版社，1991：1–7.(ZHU Weishen，LI Xinping. Equivalent elastic damage model for joint rock mass and its finite element analysis[C]// Proceedings of the 4th national rock and soil mechanics numerical analysis and analytical symposium. Wuhan：Wuhan Technical University of Surveying and Mapping Press，1991：1–7.(in Chinese))
[8] 杨 强，陈 新，周维垣. 基于二阶损伤张量的节理岩体各向异性屈服准则[J]. 岩石力学与工程学报，2005，24(8)：1 275–1 282. (YANG Qiang，CHEN Xin，ZHOU Weiyuan. Anisotropic yield criterion for jointed rock masses based on a two-order damage tensor[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(8)：1 275–1 282. (in Chinese))
[9] 蓝 航，姚建国，张华兴，等. 基于FLAC3D的节理岩体采动损伤本构模型的开发及应用[J]. 岩石力学与工程学报，2008，27(3)：572–579.(LAN Hang，YAO Jianguo，ZHANG Huaxing，et al. Development and application of constitutive model of jointed rock mass damage due to mining based on FLAC3D[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(3)；572–579.(in Chinese))
[10] JIANG Y J，LI B，YAMASHITAD Y J. Simulation of cracking near a large underground cavern in a discontinuous rock mass using the expanded distinct element method[J]. International Journal of Rock Mechanics and Mining Sciences，2009， 46(1)：97–106.
[11] 赵延林，曹 平，文有道，等. 渗透压作用下压剪岩石裂纹损伤断裂机制[J]. 中南大学学报(自然科学版)，2008，39(4)：838–844. (ZHAO Yanlin，CAO Ping，WEN Youdao，et al. Damage fracture failure mechanism of compressive-shear rock cracks under seepage pressure[J]. Journal of Central South University(Science and Technology)，2008，39(4)：838–844.(in Chinese))
[12] 赵延林，曹 平，汪亦显，等. 裂隙岩体渗流–损伤–断裂耦合模型及其应用[J]. 岩石力学与工程学报，2008，27(8)：1 634–1 643. (ZHAO Yanlin，CAO Ping，WANG Yixian，et al. Coupling model of seepage-damage-fracture in fractured rock masses and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(8)：1 634–1 643.(in Chinese))
[13] 赵延林，王卫军，黄永恒，等. 裂隙岩体渗流–损伤–断裂耦合分析与工程应用[J]. 岩土工程学报，2010，29(1)：24–32.(ZHAO Yanlin，WANG Weijun，HUANG Yongheng，et al. Coupling analysis of seepage-damage-fracture in fractured rock mass and engineering application[J]. Chinese Journal of Geotechnical Engineering，2010，29(1)：24–32.(in Chinese))
[14] 朱维申，何满潮. 复杂条件下围岩稳定性与岩体动态施工力学[M]. 北京：科学出版社，1996.(ZHU Weishen，HE Manchao. Stability analysis for surrounding rock and dynamic construction of rock mechanics in complex conditions[M]. Beijing：Science Press，1996.(in Chinese))
[15] 徐靖南，朱维申，白世伟. 压剪应力作用下多裂隙岩体的力学特性——断裂损伤演化方程及试验验证[J]. 岩土力学，1994，15(2)：1–12.(XU Jingnan，ZHU Weishen，BAI Shiwei. Multi-crack rock mass mechanical character under the state of compression-shearing—— fracture and damage evolution and testing verification[J]. Rock and Soil Mechanics，1994，15(2)：1–12.(in Chinese))
[16] 易顺民，朱珍德. 裂隙岩体损伤力学导论[M].北京：科学出版社，2005.(YI Shunming，ZHU Zhende. The introduction of fractured damage mechanics for rock mass[M]. Beijing：Science Press，2005.(in Chinese))
[17] KEMENY J，COOK N G W. Effective module nonliner deformation and strength of a cracked elastic solid[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1986，23(2)：107–118.
[18] 中国航空研究院. 应力强度因子手册[M]. 北京：科学出版社，1993. (China National Aviation Academy. Stress intensity factor handbook[M]. Beijing：Science Press，1993.(in Chinese))
[19] 中华人民共和国国家标准编写组. GB50287–99 水利水电工程地质勘察规范[S]. 北京：中国计划出版社，1999. (The National Standards Compilation Group of People¢s Republic of China. GB 50287–99 Code for water resources and hydropower engineering geological investigation[S]. Beijing：China Planning Press，1999.(in Chinese)) |
|
|
|
2010, Vol. 29 
