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| 1 | 复合软岩穿层锚固效应的理论和数值模拟研究(英文)显示文摘复合软岩的锚固机理及锚固失效特征不同于单一岩体锚固。针对西部矿区复合软岩顶板锚固问题,考虑岩层间的横向剪切滑移,建立了含软弱界面复合软岩锚固的力学模型;提出采用锚固效应因子量化穿层锚杆的锚固效应;从加锚复合岩体的变形破坏过程出发,研究了系统锚杆的加固效果与机理,建立加固效果演化方程;采用有限元方法,进一步建立了复合软岩锚固的数值计算模型,分析了岩体在横向载荷作用下,节理面附近锚杆和岩体的变形特征、应力分布规律以及破坏行为。理论研究结果表明,穿层锚杆的加固效应与锚杆的刚度参数、几何参数,围岩的刚度参数和几何参数据有关。锚固效应因子是一个随着围岩工作状态改变而变化的量。从数值计算结果看,锚杆在横向荷载作用下的弯折变形主要集中在节理面附近的两塑性铰之间,变形曲线可用Doseresp模型进行表征;在2个塑性铰处,锚杆存在最大拉压应力,在节理面处,出现最大剪应力,复合岩体在节理面附近由于锚杆的反作用最先出现塑性破坏区。以上结果为进一步研究复合软岩锚固失效奠定了理论和计算基础。 | 赵增辉 高晓杰 谭云亮 马庆 | 2018 | Journal of Central South University2018，25，10： | 6 |
| 2 | Numerical analysis of the effects of rock bolts on stress redistribution around a roadway显示文摘Besides opening geometry, in situ stress and material properties, opening support also has significant effects on stress redistribution around a roadway. To investigate these effects of rock bolts on the stress redistribution around a roadway, a series of numerical studies were carried out using the finite difference method. Since the stress changes around a roadway caused by rock bolting is small relative to the in situ stress, they cannot obviously be observed in stress contour plots. To overcome this difficulty, a new result processing methodology was developed using the contouring program Surfer. With this methodology, the effects of rock bolts on stress redistribution can obviously be analyzed. Numerical results show that in the three patterns of rock bolts installed in the roof, in the roof and the two lateral sides, and in all the four sides of the rectangular roadway, the maximum stress magnitude of the increase is 0.931 MPa, 2.46 MPa,and 6.5 MPa, respectively; the bolt number of 5 can form an integrated ground arch; the appropriate length and pre-tensioned force of the rock bolt is 2.0 m and 60 k N, respectively. What is more, the ground arch action under the function of rock bolting is able to be effectively examined. The rock bolts dramatically increase the minor principal stress around a roadway which results in significant increase in material strength. Consequently, the major principal stress that the material can carry will greatly increase.With adequate supports, an integrated ground arch which is critical for the stability of roadway will be formed around the roadway. | Du Zesheng Qin Botao Tian Fuchao | 2016 | International Journal of Mining Science and Technology2016，26，6： | 5 |
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