巷(隧)道支护中的非对称荷载效应

Unsymmetrical Load Effect in Tunnel Support Design

针对对称结构的巷 (隧 )道支护体在非对称荷载作用下易于变形和破坏的特点 ,通过大量的现场观测 ,建立了该条件下巷 (隧 )道的“支护体—围岩”相互作用模型 ,引入非对称荷载因子和结构分析方法 ,研究了不同类型支护体在非对称荷载条件下的内力及变形性能 ,讨论了非对称荷载对支护体承载能力和可缩性能的影响 ,并据此给出了该条件下巷 (隧 )道支护体的设计要素。

According to the large amount of data from site observation, the paper sets up an analyzing model of 'support-surrounding rock' interaction relationship in the light of the special characteristics of symmetrical structure support, which under the unsymmetrical load action is easy to deform and damaged. By means of structure analysis, and with the tool of 'unsymmetrical load factor' introduced by authors it studies the internal stress and deformation of different supports on the condition of unsymmetrical load surroungdings and discusses the influences on its load-bearing capacity and sliding behaviour of slit. Finally it reaches the main design elements of support that applied in unsymmetrical load circumstance.