不同工法在炭质片岩隧道大变形控制中的应用研究

发布时间：2019-08-08 10:28

【摘要】：隧道施工工法在控制位移变形、资源投入、工程进度、施工成本以及保证施工和结构安全等方面有着重要的作用。为解决炭质片岩隧道修建过程中存在的大变形、坍塌、初期支护及二次衬砌开裂等问题,以谷竹高速公路宴家隧道、关垭子隧道为例,对复杂地质条件下,含绢云母炭质片岩隧道施工工法的适用性进行了研究。通过对软岩隧道施工工法进行分析,并结合工程的地质特征和隧道的断面大小对施工工法进行了优选,经过现场实际验证,说明三台阶法、CRD法、双侧壁导坑法能有效控制围岩大变形,且控制能力依次增强,另外超前预支护对预防隧道坍塌有显著的安全保障作用。
[Abstract]:Tunnel construction method plays an important role in controlling displacement deformation, resource investment, project progress, construction cost and ensuring the safety of construction and structure. In order to solve the problems existing in the construction of carbon schist tunnel, such as large deformation, collapse, initial support and cracking of secondary lining, the applicability of construction method of sericite carbon schist tunnel under complex geological conditions is studied by taking Banjia tunnel and Guanyazi tunnel of Guzhu expressway as examples. Through the analysis of the construction method of soft rock tunnel, and combined with the geological characteristics of the project and the section size of the tunnel, the construction method is optimized. Through the field verification, it is shown that the three step method, CRD method and bilateral wall pit guide method can effectively control the large deformation of surrounding rock, and the control ability is enhanced in turn. In addition, advance pre-support plays a significant safety role in preventing tunnel collapse.
【作者单位】：中铁隧道集团一处有限公司;
【分类号】：U455.4

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