泡沫混凝土预留变形层对深埋软岩隧道长期稳定性影响研究  

Study of effects of foam concrete preset deformation layer on long-term stability of deep soft rock tunnel

作　　者：陈卫忠[1,2] 田洪铭[2] 杨阜东[1] 耿亚梅[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室,武汉430071

出　　处：《岩土力学》2011年第9期2577-2583,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.40772184)

摘　　要：泡沫混凝土的单轴和三轴试验研究表明,泡沫混凝土具有较高压缩性和良好延性,可以作为深埋软岩隧道初期支护与二次衬砌之间预留变形层填充材料,分析了其对宜巴高速公路深埋软岩隧道长期稳定性的影响。研究表明,深埋软岩软岩隧道在二次衬砌施工之后依然会产生较大的蠕变变形,单纯依靠提高二次衬砌的厚度,并不能完全控制住围岩的蠕变变形,而且衬砌结构很容易由于变形压力过大而发生破坏。泡沫混凝土预留变形层,可以很好地吸收围岩蠕变变形,缓解二次衬砌承担的蠕变变形压力,减小衬砌的变形,改善其受力,采用厚度较小的二次衬砌即满足隧道长期运营的要求。Uniaxial and triaxial tests of foam concrete show that the foam concrete which has the capacity of high compressibility can be used as filling material between primary support and secondary lining in deep soft rock tunnel.And the effects of this filling material which is called preset deformations layer on long-time stability of Yi-Ba expressway is studied.The results show that the creep deformation of surrounding rock in deep tunnel still increase after the construction of secondary lining;and it is hardly to be controlled by the method of increasing the thickness of lining;besides,the secondary lining is more easily destroyed by deformation pressure.However,preset deformation layer of foam concrete is able to decrease the deformation pressure on secondary lining by absorbing the creep deformation of rock.As a result,long-term stability of deep soft rock tunnel can be guaranteed by much thinner secondary lining.

关 键 词：深埋软岩隧道 泡沫混凝土 长期稳定性 预留变形层 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]