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采用模型试验方法,研究分析了Ⅳ级围岩条件下隧道开挖后,因降雨而引起的隧道塌方。试验结果表明,随着水的入渗,地表位移逐渐增加,隧道塌方前,地表位移增加趋势明显,塌方后,隧道侧壁垂直应力及水平应力减小,拱底垂直应力增大,且距隧道越近的测点应力变化幅度越大。
Using the model test method, the tunnel collapse caused by rainfall after the tunnel excavation under grade Ⅳ surrounding rock was studied and analyzed. The test results show that with the infiltration of water, the surface displacement increases gradually. Before the tunnel collapses, the surface displacement increases obviously. After the collapse, the vertical stress and horizontal stress in the sidewall of the tunnel decrease, and the vertical stress in the arch increases. The closer the measured point stress changes, the greater the magnitude.