东巨寺沟隧道湿喷纤维混凝土支护结构和围岩稳定性位移模糊判别

;湿法喷射混凝土可有效地改善隧道内作业环境、反弹量小、喷射质量高,是隧道支护结构施工值得推广的工艺.首次在宝鸡-兰州铁路复线东巨寺沟铁路隧道选取试验段,实施湿喷工艺喷射聚丙烯纤维混凝土,作为支护结构兼作永久性支护,免除二次衬砌工作,并进行水平位移收敛监测.采用非线性最小二乘法对该隧道水平收敛曲线进行回归分析,同时采用隧道稳定性模糊概率分析理论对不同断面位置处的隧道围岩稳定性进行判别分析.分析结果表明,采用湿喷纤维混凝土支护的隧道围岩处于稳定状态,可靠度指标高.

Dongjusigou railway tunnel wet sprayed fiber reinforced concrete lining structure and rock mass stability analysis using displacement fuzzy probability determination method

The wet sprayed concrete technique has good virtue of improving the working condition within the tunnel. Compared with the common sprayed concrete technique, the wet sprayed concrete technique has fewer reflective concrete loss and higher sprayed concrete quality. It is worth of being spread in the tunnel lining structure construction process. The wet sprayed polypropylene fiber reinforced concrete was first introduced in the Dongjusigou railway tunnel lining structure in China Baoji-Lanzhou resuming line. The nonlinear least square method is used to regress the tunnel horizontal convergence curve at two transverse sections. The tunnel stability fuzzy probability analysis theory is applied to calculate the probability of the railway rock mass stability at different section locations. The analytical result shows that the railway rock mass using the wet-sprayed fiber reinforced concrete lining structure is in stable state and the tunnel rock mass has higher reliability index. The wet-sprayed fiber reinforced concrete lining structure has good lining effect.