摘要
锚杆支护是提高岩土工程稳定性的一种经济和有效的方法。以万松岭隧道开挖支护过程的工程实践为依托,通过对中空注浆锚杆与普通砂浆锚杆在锚护结构、受力机理差异等方面的比较分析;利用有限元法分别模拟比较了在开挖无支护、普通砂浆锚杆支护和中空注浆锚杆支护时围岩塑性区扩展规律、隧道顶板沉降量、不同锚杆的轴力分布规律。结果表明:采用中空注浆锚杆技术能有效控制隧道开挖时的沉降量、减少围岩塑性区的扩展,提高围岩的稳定性,实现了锚杆的主动支护作用。
It is a kind of more economic and effective method for improving geotechnical engineering stability by bolts support. Taking the project practices during undercutting and supporting stages in Wansongling Tunnel for example,a comparative analysis of the differences on support structures and mechanism was carried out between hollow grouted bolts and normally grouted bolts. Then it was analyzed the plastic zone of surrounding rocks,the settlement of tunnel roofs,and the distributive rules of axial forces of different support bolts during undercutting and supporting stages under no support,normally grouted bolts support and hollow grouted bolts support respectively by finite element method. The results showed that the settlement of tunnel roofs was effectively controlled,the plastic zone expanding of surrounding rocks was reduced by the technology of hollow grouted bolts support. So the surrounding rocks stability was improved,and the active supporting of bolts was achieved.
出处
《工业建筑》
CSCD
北大核心
2016年第11期137-141,共5页
Industrial Construction
基金
国家自然科学基金项目(41172317)
关键词
隧道工程
围岩
锚杆支护
中空注浆锚杆
有限元
tunneling engineering
surrounding rock
bolt support
hollow grouted bolt
finite element
