偏压隧道施工方案的有限元分析

THE FINITE ELEMENT ANALYSIS OF CONSTRUCTION SCHEMES OF UNSYMMETRICALLY LOADED TUNNEL

根据里山隧道存在偏压的地质情况,提出全断面法、台阶法、CRD法、侧壁导坑法4种施工方法。对这些方案进行有限元数值仿真分析,分别从围岩应力、围岩位移、初衬内力3个方面进行比较,同时考虑经济效益,最后选择台阶法施工,后经施工验证此施工方法安全可靠。

According to the geological condition of Lishan tunnel with unsymmetrical loading,this paper puts forward four construction method: the whole section method,the bench method,the CRD method,the side slope method. To compare those schemes’influences on the displacements of surrounding rock,stress,primary support internal force and economic benefit,we finally choose the bench method construction which is safe and reliable after the validation of this construction.