断裂黏滑隧道减震缝减震技术模型试验研究

MODEL TEST STUDY OF SHOCK ABSORPTION JOINT DAMPING TECHNOLOGY OF CROSSING STICK-SLIP FRACTURE TUNNEL

以汶川地震龙溪隧道F8黏滑断裂段震害为研究背景,开展减震缝减震技术的大型正断裂黏滑错动模型试验研究。首先介绍试验方案,主要包括相似设计、试验设备及材料、试验分组、测试方案及试验过程。然后,对试验数据进行分析,主要研究隧道的结构内力、纵向应变及接触压力。试验结果表明:断裂黏滑错动后,上盘受断裂黏滑错动影响大于下盘;初期支护施设减震缝减震效果不明显;二衬施设减震缝(间距12 m)的减震效果略优于二衬施设减震缝(间距9 m),从施工方便性、经济性考虑,推荐使用二衬施设减震缝(间距12 m)的减震方式。研究成果对于穿越黏滑断裂隧道的减震技术有着重要的意义。

In order to study the tunnel shock absorption joint damping technology of crossing stick-slip fracture, the seismic damage of Longxi tunnel F8 stick-slip fracture section in Wenchuan earthquake is selected as the research background to conduct large-scale model test of normal faulting stick-slip movement. Firstly, the test scheme is introduced, including the similar design, the test facility and material, the test grouping, the testing scheme and test process. Then, the test data is analyzed, and the structural internal force, longitudinal strain and contact pressure of tunnel vault are mainly researched. The results show that the effect of stick-slip fracture movement on hanging wall is larger than that on footwall~ the damping effect of primary lining setting shock absorption joint is not obvious; the damping effect of secondary lining setting shock absorption joint that spacing is 12 m is slightly better than 9 m. In consideration of economy and easy construction, the damping mode of secondary lining setting shock absorption joint（spacing is 12 m） is recommended. These results are significant to the damping technology of tunnel of crossing stick-slip fracture.