摘要
喷射混凝土在岩土和采矿工程中的隧道、巷道及洞室支护中已经有很长时间的应用,它一般与锚杆一起使用,作为主动支护技术取得了突出的支护效果。对于喷层,其支护机理在不同的地质和工作条件下不尽相同,传统的支护理论将喷层作为一种受力承载结构,并强调喷层厚度的重要性。随着科技的进步,新型喷涂材料的出现,一些潜藏的支护作用逐渐凸显出来,例如喷层与岩面的粘结强度,渗入裂隙部分等。本文在总结喷层传统支护机理的基础上,结合新喷层材料的特殊性能,将其支护机理重新归纳总结为承载壳作用,胶结作用,及楔子作用。根据喷层材料及支护作用的不同,对喷层材料的性能测定要求也不一样。
Sprayed concrete has used in tunneling support for many years and produces a good support effect when it is been used with rockbolts.The support mechanisms of the sprayed concrete lining are depended on different behavior of the ground.In early years,the liners were identified as a load bearing structures and the thickness of the liners was emphasized.Recently,there are many new kinds of sprayed material invented and some potential support behavior highlighted,the bond strength between the lining and rock,or the penetration of the sprayed concrete into fractures,for example.In summary the mechanism of thin-lined spray concrete on fractured rock masses can be described as a load bearing shell,which plays a role as glue（cementation） and a wedge.And the material test criteria are determined by their mechanical properties.
出处
《地下空间与工程学报》
CSCD
北大核心
2011年第4期759-763,共5页
Chinese Journal of Underground Space and Engineering
关键词
隧(巷)道
喷层支护
承载壳作用
胶结作用
楔子作用
tunnel
sprayed concrete support
load bearing shell effect
cementation effect
wedge effect
