断层破碎带隧道突水突泥灾变演化模型试验研究

发布时间：2018-03-13 10:13

本文选题：断层破碎带　切入点：突水突泥　出处：《岩土力学》2016年10期 　论文类型：期刊论文

【摘要】：为研究断层破碎带隧道开挖扰动作用下突水、突泥灾变演化过程,建立了三维地质模型试验系统,以江西永莲隧道F2断层突水、突泥灾害为例,通过大量的材料配比及物理力学性能参数测试,研制出适用于流-固耦合模型试验的新型断层及正常围岩相似材料,对隧道突水、突泥灾害进行研究。试验结果有效地揭示了无支护条件下断层破碎带隧道的洞周位移、渗流压力、应力-应变以及突出物质量等特征参数对时效性的响应规律。随着时间的增长,渗流压力整体呈上升趋势,越靠近开挖面其波动范围及幅度越大;突出物质量在发生突水、突泥灾害前出现短时减小后迅速增加;洞周围岩拱顶以竖向位移为主,而拱腰以水平位移为主;在相同相应力状态下,拱腰位置应变比拱顶位置大。将试验灾变特征与现场实际演化过程进行对比分析,两者结果较为吻合。该系统可广泛应用于其他地下工程的模型试验研究,其研究方法及结果对类似工程研究具有一定的指导和借鉴意义。
[Abstract]:In order to study the process of water inrush and gouge catastrophe evolution under the disturbance of tunnel excavation in fault-broken zone, a three-dimensional geological model test system was established. The fault water inrush and mud inrush disaster of Yonglian Tunnel in Jiangxi Province was taken as an example. A new type of similar material for fluid-solid coupling model test has been developed through a large number of material ratios and physical and mechanical parameters, which is suitable for tunnel water inrush. The test results effectively reveal the tunnel circumference displacement and seepage pressure in the fault-broken zone under the condition of no support. The response of stress-strain and mass of protrusions to the time-efficiency. With the increase of time, the seepage pressure increases, and the fluctuation range and amplitude of the seepage pressure increase with the increase of time, and the mass of the outburst occurs in the process of water inrush. The rock arch around the tunnel is dominated by vertical displacement, while the arch waist is dominated by horizontal displacement. The strain in the arch waist is larger than that in the arch top. The results of comparison and analysis between the experimental catastrophic characteristics and the field evolution process are in good agreement. The system can be widely used in the model test of other underground projects. Its research methods and results have certain guidance and reference significance for similar engineering research.
【作者单位】：山东大学岩土与结构工程研究中心;
【基金】：国家重点研发计划项目(No.2016YFC0801600) 国家自然科学基金(No.41272385,No.51139004) 博导基金(No.20130131110032)~~
【分类号】：U456

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