锚固类结构杆体临界锚固长度问题综合研究

COMPREHENSIVE RESEARCH OF CRITICAL ANCHORAGE LENGTH PROBLEM OF ROD OF ANCHORAGE STRUCTURE

锚固类结构杆体临界锚固长度是指一定岩土介质中锚固类结构杆体的极限锚固长度,超过此长度,其承载力将不再明显增加;未达此长度,其承载力尚有一定潜力可挖。数十年来,特别是近10a来,国内以不同的方法,从不同的侧面对锚固类结构杆体临界锚固长度问题进行研究,取得若干成果。对其中较典型的研究成果作评述和再分析,着重指出:系统的研究仍较为缺乏,直接的研究较为少见,仍处于局部发现问题局部探讨解决的阶段;临界锚固长度现象是普遍存在的,对此问题的透彻研究,将对现行国内外基于平均剪应力概念和方法的设计理论提出严重质疑和挑战,并最终将导致锚固类结构传统设计理念的根本性变化;临界锚固长度现象的发现,国外早于我国10多年时间,但作为专用的具有明晰概念的名词"临界锚固长度",目前尚无此称谓。

The critical anchorage length refers to the limit anchorage length of the rod of anchorage structure in certain soil and rock.If the rod length exceeds this length,the bearing capacity will not obviously increase,but if the rod length doesn＇t reach this length,the bearing capacity can be further improved.In recent ten years,the relevant problems of critical anchorage length are researched in China,and many results have been obtained.The typical research results have reviewed and analyzed.It is emphasized that it is still short of systemic study,and this problem has not been solved and is still under discussion.The critical rod anchorage length is a common phenomenon.This problem needs further study on the current design methods based on the average shear stress theory,and will result in the ultimate change of traditional anchorage structure design concepts.For the discovery of the critical anchorage length phenomenon,it is about 10 years earlier in foreign countries than in China.However,as the term of critical anchorage length with distinct concept,it should be focused on.