Bedding complex geological tunnel micro-step excavation test method

The invention discloses a bedding complex geological tunnel micro-step excavation test method, which belongs to the technical field of tunnel excavation construction, and comprises the following steps: drawing up a three-step construction scheme of five different step heights to carry out a model test, and determining the tunnel micro-step excavation test according to the change rules of surrounding rock stress, support stress and vault settlement after tunnel excavation under different step heights. And the change rule is analyzed to obtain an optimal construction scheme, so that the optimal three-step excavation height proportion is determined, the settlement amount of the vault and the stress of each position of the tunnel are ensured to be within a safe and reliable range, and safe and reliable construction is realized. 本发明公开了一种顺层复杂地质隧道微台阶开挖试验方法，属于隧道开挖施工技术领域，该方法拟定五个不同台阶高度的三台阶施工方案进行模型试验，通过不同台阶高度下，隧道开挖后围岩应力、支护受力及拱顶沉降的变化规律，分析该变化规律获得最佳的施工方案，进而确定最佳的三台阶开挖高度比例，进而确保拱顶沉降量和隧道各个位置应力在安全可靠的范围内，实现安全可靠的施工。