摘要
软岩大变形工程存在因开挖卸荷导致较大的应力释放,在工程施工过程中将会产生较大变形的特点,如沿用传统的锚杆进行支护,岩体的大变形所产生的过大拉力将会造成锚杆的拉断破坏.针对软岩大变形工程存在的该类问题,介绍了一种新型的端部具有让压装置的新型压力分散型让压锚杆,并对该让压锚杆的作用机理和力学行为进行分析,得出锚固体的作用机理与传统压力分散型锚杆相比分为3个阶段,并通过试验的方式确定了该让压锚杆的让压力.这种新型让压锚杆在将锚固体压力分散的同时,实现大变形的让压,适宜在大变形工程中进行应用.
The soft rock project with large deformation is characteristic of large stress released in the excavation and of large deformation in the construction process. Using the traditional rock bolt support, the large deformation of the rock mass may lead to a large tension, and make the rock bolt fracture. A new-type yielding bolt for soft rock projects with large deformation is proposed in this paper. This yielding bolt is a pressure dispersion-type yielding bolt, and contains a yield supporting device at the bottom of the bolt. The supporting mechanism of the yielding bolt includes three stages, and the yield force value is determined by experiments.The yielding bolt not only disperses the stress in the anchoring body, but also generates a yield deformation,so it could be applied to soft rock projects with large deformation.
出处
《力学与实践》
北大核心
2015年第2期193-196 237,237,共5页
Mechanics in Engineering
关键词
让压锚杆
软岩大变形
压力分散型
作用机理
yielding bolt,soft rock project with large deformation,pressure dispersion-type,mechanism
