洛川隧道围岩变形规律模型试验研究  

Model tests on soil deformation of surrounding soil of Luochuan tunnel

作　　者：贾伟 李尧[2] 郭张龙 田超鹏 JIA Wei;LI Yao;GUO Zhanglong;TIAN Chaopeng(The 2nd Engineering Co.,Ltd.,China Railway 20 Bureau Group,Xi'an 710038,China;School of Highway,Chang’an University,Xi'an 710064,China)

机构地区：[1]中铁二十局集团第二工程有限公司,陕西西安710038 [2]长安大学公路学院,陕西西安710064

出　　处：《岩土工程学报》2024年第S01期164-169,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金面上项目(52078045)。

摘　　要：以洛川隧道DK194+835为研究断面,开展不同埋深下隧道模型试验研究。通过各种试验确定原型、相似材料土和衬砌的参数,利用3D打印技术研制出一套新型衬砌材料及连接方式较好的模拟了实际工程中喷射混凝土、钢架、超前小导管。利用自制多点位移计等各种监测原件采集开挖过程中围岩内部变形及地表沉降数据。试验表明:可通过拼装的方式在模型试验中模拟隧道的分布支护,可使用滑动式连接件链接相邻位置的石膏块;不同测点竖向位移均经历缓慢增长(开挖面远离监测断面)、迅速增长(开挖面接近监测断面)、逐步稳定(开挖面经过监测断面)3个阶段。随埋深增加,监测断面前期变形(开挖面远离、接近监测断面)占比减小;地表沉降经历缓慢增长、迅速增长、逐步稳定3个阶段。随埋深增加,监测断面前期地表沉降占比减小。Based on the cross-section DK194+835 of Luochuan tunnel,model tests are conducted under different burial depths.The study involves to determine the parameters of the prototype,similar soil and lining through various experiments.Additionally,a set of new lining materials and connection methods are developed using the 3D printing technology to better simulate the shotcrete,steel frame and advanced small ducts in tunnel engineering.Various monitoring components,including self-made multi-point displacement meters,are used to collect data on the internal deformation of the surrounding rock and the surface settlement during excavation process.The test results demonstrate that the distributed support of the tunnel can be effectively simulated in the model tests through assembly,and sliding connectors can be used to link adjacent gypsum blocks.The vertical displacements at different measuring points exhibit a pattern of slow growth when the excavation surface is far from the monitoring section,the rapid growth as the excavation surface approaches the monitoring section,and the gradual stabilization after the excavation surface passes through the monitoring section.Furthermore,it is found that as the burial depth increases,the proportion of early deformation of the monitored section(i.e.,the excavation surface moving away from and approaching the monitored section)decreases.The surface subsidence also undergoes three stages:slow growth,rapid growth,and gradual stabilization.Similarly,with the increasing burial depth,the proportion of early surface settlement of the monitored section decreases.

关 键 词：黄土隧道 模型实验 围岩 变形 地表下沉 埋深影响 

分 类 号：TU43[建筑科学—岩土工程]