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考虑渗流、应变软化和扩容的巷道围岩弹塑性分析
高召宁1,2, 孟祥瑞2, 付志亮2
1.安徽理工大学 矿业工程博士后流动站,安徽 淮南 232001;2.煤矿安全高效开采省部共建教育部重点实验室,安徽 淮南 232001
摘要:
考虑了渗流体积力、岩体应变软化、破裂膨胀性重要因素,应用弹塑性力学理论,推导了渗流场作用下巷道围岩的应力和位移分布规律,给出了巷道围岩不同分区范围与孔隙水压力、岩体应变软化程度、破裂膨胀性之间的关系;研究表明,孔隙水压力和岩体破裂膨胀特性对巷道围岩破裂区范围的影响程度比对塑性区范围的影响程度明显;考虑渗流场比不考虑渗流场的影响时,塑性区范围和破裂区范围都要大;岩体应变软化程度对巷道围岩塑性区和破裂区的范围影响同样显著;渗流、应变软化、破裂膨胀性对巷道围岩变形的影响都比较明显。研究成果为渗流场作用下的巷道支护工程有一定的参考价值。
关键词:  巷道围岩  渗流  孔隙水压力  应变软化  扩容
DOI:10.11835/j.issn.1000-582X.2014.01.015
分类号:
基金项目:国家自然科学基金资助项目(51074003,51074005);国家自然科学基金委员会与神华集团有限公司联合资助项目(51174255);中国博士后科学基金资助项目(2012T50567,2011M501037);高等学校博士学科点专项科研基金项目新教师类资助项目(20093415120001)
Elasto-plastic analysis on surrounding rock of roadways based on seepage, strain softening and dilatancy
GAO Zhaoning1,2, MENG Xiangrui2, FU Zhiliang2
1.Mobile Center of Postdoctor Science and Research of Mining Engineering, Anhui University of Science & Technolyg, Huainan, Anhui 232001, China;2.Key Laboratory of Coal Mine Safety and High Efficiency Mining Cosponsored by Province and MOE, Huainan, Anhui 232001, China
Abstract:
According to seepage body force, strain softening and rupture expansion of rock mass, elastic-plastic mechanics theory, distribution laws of stress and displacement of surrounding rock in seepage field are derived, and relationships between different zonation range of the surrounding rocks, pore water pressure, strain softening and rupture expansion are established. The results show that the pore water pressure and rupture expansion rock mass have a more obvious impact on the surrounding rock rupture area than the plastic zone. Both the plastic zone and the rupture area are larger when the seepage field is considered. The impact of strain softening on both the plastic zone and the rupture zone of surrounding rock is very significant, and both seepage and strain softening rupture expansion affect deformation of surrounding rock of roadways obviously. It provides certain reference values for the roadway support engineering in seepage field.
Key words:  surrounding rock of roadways  seepage  pore water pressure  strain softening  dilatancy
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