兰渝铁路胡麻岭隧道第三系弱成砂岩蠕变特性试验研究

Test Research on Creeps of Tertiary Weak Sandstone: Case Study on Humaling Tunnel on Lanzhou-Chongqing Railway

为掌握砂岩地层蠕变特性,保证施工和运营期间的结构安全,以兰渝铁路胡麻岭隧道第三系富水弱成段施工为依托,从采用改制的流变仪进行蠕变特性试验,得出了蠕变方程描述弱成砂岩蠕变特性随含水量的变化情况,分析了各种含水量状态下的蠕变特性,讨论了不同含水量情况下变形与持续时间的影响关系,并以试验数据为基础提出了相配套的设计原则和施工方法。

Humaling tunnel on Lanzhou-Chongqing railway passes through Tertiary water-rich weak sandstone.Serious deformation occurs during the construction of the tunnel.Creeping test is made on the soil samples and the characteristics of the weak sandstone are obtained,the creeping characteristics of soils with different water content rates are analyzed,the relationship between the deformation and the deformation-lasting time of soils with different water content rates is discussed,and corresponding tunnel design principle and tunnel construction methods are proposed.