扩大头锚索在饱和粉细砂层中的受力特性  

Mechanical Characters of Bit Expanded Anchor Rods in Saturated Fine Sand Stratum

作　　者：刘波[1] 张功[1,2] 杨伟红[1] 任鑫[1] 宋常军[3] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]北京住总集团有限责任公司轨道交通市政工程总承包部,北京100029 [3]交通运输部公路科学研究院公路交通工程研究中心,北京100088

出　　处：《地下空间与工程学报》2016年第2期412-419,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(U1261212);国家科技支撑计划项目课题(2012BAK24B0201);中央在京高校重大成果转化项目(2012)

摘　　要：对于特殊复杂的地质条件以及对变形要求较高的地下工程,扩大头预应力锚索有效利用扩大头前端土体抗力,提高锚索的承载能力和支护结构的抗变形能力,是一种较为理想的支护方式。扩大头锚索的理论研究与设计滞后于工程经验,基于弹性理论,通过研究扩大头前端土体受力状态与土压力的关系以及锚固土体接触面的应力状态,分析了土层变形过程中锚索的受力特性,建立了扩大头预应力锚索在土体变形过程中的力学模型,通过实例验证了公式的适用性,为研究与评估施工过程中扩大头锚索的整体受力情况提供了新的思路。For underground projects with special complex geological conditions or stricter requirements for soil deformation,the bit expanded anchor rods is an ideal supporting structure for improving bearing capacity and resistance to deformation through making effective use of soil resistance in front of bit expanded head of anchor. Theoretical research and design of bit expanded anchor rods lag behind the engineering experience. By studying the relationship between earth pressure and stress state in front of bit expanded head of anchor and stress state of interface of soil and anchorage body based on elasticity theory,the mechanism of bit expanded anchor rods loading during the process of soil deformation is analyzed and a mechanical model is established and its feasibility is verified through monitored data,and which raises a new ideas of prestress value evaluation of bit expanded anchor rods in overall construction process.

关 键 词：扩大头锚索 土体变形 饱和粉细砂 应力状态 

分 类 号：TU443[建筑科学—岩土工程]