摘要
三峡永久船闸闸室的高、薄混凝土衬砌墙由高强结构锚杆与闸室岩体联结,单根锚杆在工程运行期所受最大张拉荷载可能达到600 kN,薄混凝土衬砌墙能否提供足够的锚固力,以及混凝土的受力和破坏状态如何,是工程中非常关心的问题。以三峡工程问题的现场试验为依托,在回答工程问题的同时,着重讨论了在受张拉荷载作用下全长粘结锚杆的工作机理,指出了锚杆在轴向受拉过程中,受锚杆螺纹的影响,锚杆与粘结介质之间将产生法向剪胀变形,对保障和提高锚杆的锚固力具有特别重要的意义。还对全长粘结锚杆的设计理论、提高锚固效果的措施进行了讨论。
High and thin concrete liner on the wall of chambers is connected to rock mass with high strength construct bolt in permanent shiplocks at the Three Gorges Project. During the operation,the maximum tensile load may be up to 600 kN for single bolt. It is a considerable problem whether concrete can bear the load or not,and what the stress state and possible failure will be. Based on the field testing results,the answer is presented for these problems and the working mechanism of full grouting bolt also discussed. It is pointed out that normal dilated deformation would appear on the interface between cohering medium and bolt because of the screw thread. It is of special effect on ensuring and enhancing bond force. Meanwhile,the design theory for grouting bolt and measures for increasing bond force are discussed.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第3期379-384,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
教育部高等学校骨干教师资助项目。
