| 引用本文: | 王志杰,侯伟名,吴凡,王李,高靖遥,周平.考虑相对密实度的风积沙隧道围岩稳定性分析[J].哈尔滨工业大学学报,2021,53(3):127.DOI:10.11918/202002030 |
| WANG Zhijie,HOU Weiming,WU Fan,WANG Li,GAO Jingyao,ZHOU Ping.Surrounding rock stability analysis of aeolian sand tunnel considering relative compactness[J].Journal of Harbin Institute of Technology,2021,53(3):127.DOI:10.11918/202002030 |
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| 摘要: |
| 为提高风积沙隧道施工安全性,以蒙华铁路王家湾隧道为依托开展施工模拟,探讨围岩稳定性变化规律. 通过现场取土开展室内试验,得到围岩物理力学特性,并基于砂性围岩较强的非连续性,采用离散元软件进行不同相对密实度风积沙隧道施工过程模拟,对围岩应力动态变化及松动区发展进行监测分析. 结果表明:在风积沙隧道开挖过程中掌子面前方围岩先行位移的发生范围与围岩相对密实度呈正相关,拱顶上方受扰动范围与围岩相对密实度呈负相关；在密实风积沙隧道中易出现掌子面挤出现象,而松散地层中发生顶部塌方灾害的风险较高；风积沙隧道开挖主要对掌子面前方2/3D~D、洞周及洞室上方0.5D~D内的围岩产生扰动；在相对密实度（Dr）为0.5和0.7的围岩条件下,围岩破坏模式与《铁路隧道设计规范》（TB 10003—2016）采用的破坏模式基本一致,Dr=0.9时围岩失稳形态大致呈椭球状. 风积沙隧道围岩稳定性与其密实程度关系密切,细观颗粒的紧密结合能够有效抵抗外力作用,从而表现为宏观结构的稳定,地层稳定性随相对密实度的增大而提高. |
| 关键词: 风积沙隧道 围岩稳定性 相对密实度 离散元 围岩失稳 |
| DOI：10.11918/202002030 |
| 分类号:U45 |
| 文献标识码:A |
| 基金项目:教育部创新团队发展计划(IRT0955)； 中央高校基本科研业务费专项资金(SWJTU11ZT33) |
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| Surrounding rock stability analysis of aeolian sand tunnel considering relative compactness |
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WANG Zhijie,HOU Weiming,WU Fan,WANG Li,GAO Jingyao,ZHOU Ping
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(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education(Southwest Jiaotong University), Chengdu 610031, China)
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| Abstract: |
| To improve the construction safety of aeolian sand tunnels, construction simulation was carried out based on the Wangjiawan Tunnel of Menghua Railway to investigate the stability changes of surrounding rocks. Laboratory tests were conducted by using the soil taken from the site to obtain the physical and mechanical characteristics of the surrounding rock. Based on the discontinuity of sandy surrounding rocks, the discrete element software was adopted to simulate the construction process of aeolian sand tunnels with different relative compactness, and the dynamic changes of surrounding rock stress and the development of the loose zone were monitored and analyzed. Results show that the range of the advance displacement of the surrounding rock in front of the tunnel face was positively correlated with the relative compactness of the surrounding rock, and the disturbed range above the vault was negatively correlated with the relative compactness of the surrounding rock. Face failure was prone to occur in dense aeolian sand tunnels, and the risk of collapse in loose strata was high. The excavation of the aeolian sand tunnel mainly disturbed the surrounding rock within 2/3D-D in front of the face, around the tunnel, and within 0.5D-D above the tunnel. When the relative compactness was 0.5 and 0.7, the failure modes of the surrounding rock were basically the same as that adopted in “Code for design of railway tunnel (TB 10003—2016)”. When the relative compactness was 0.9, the form of surrounding rock instability was approximately ellipsoidal. The stability of the surrounding rock of the aeolian sand tunnel was closely related to its compactness. The tight combination of the meso-particles could effectively resist the external force, which shows the stability of the macrostructure. The stability of the stratum increased with the increase of the compactness. |
| Key words: aeolian sand tunnel surrounding rock stability relative compactness discrete element method surrounding rock instabilitySymbol`@@ |
