›› 2018, Vol. 39 ›› Issue (4): 1182-1191.doi: 10.16285/j.rsm.2017.0999

• 基础理论与实验研究 • 上一篇    下一篇

基于膨胀本构的石膏岩隧道衬砌缓冲层厚度优化研究

吴顺川1, 2,韩 伟1,陈 钒3,徐淼斐1,丛子杰1   

  1. 1. 北京科技大学 金属矿山高效开采与安全教育部重点实验室,北京 100083;2. 昆明理工大学 国土资源工程学院,云南 昆明 650093; 3. 中电建路桥集团有限公司,北京 100044
  • 收稿日期:2017-05-18 出版日期:2018-04-11 发布日期:2018-06-06
  • 通讯作者: 韩伟,男,1991年生,硕士研究生,主要从事岩土工程稳定性评价与支护等方面的研究工作。E-mail: 740531068@qq.com E-mail:wushunchuan@ustb.edu.cn
  • 作者简介:吴顺川,男,1969年生,博士,教授,主要从事岩土工程、工程力学等方面的研究和教学工作。
  • 基金资助:

    科技北京百名领军人才培养工程(No. 151100000315014);国家自然科学基金项目(No. 51774020)。

Optimisation of buffer layer thickness in gypsum rock tunnel based on swelling constitutive model

WU Shun-chuan1, 2, HAN Wei1, CHEN Fan3, XU Miao-fei1, CONG Zi-jie1   

  1. 1. Key Laboratory of Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing 100083, China; 2. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650093, China; 3. PowerChina Roadbridge Group Co., Ltd., Beijing 100044, China
  • Received:2017-05-18 Online:2018-04-11 Published:2018-06-06
  • Supported by:

    This work was supported by the Beijing Training Project for the Leading Talents in Science & Technology (Z151100000315014) and the National Natural Science Foundation of China (51774020).

摘要: 膨胀性围岩对隧道衬砌结构均有特殊要求,针对重庆梁忠高速公路礼让隧道膨胀性石膏岩的衬砌结构改进问题,基于Noorany修正膨胀本构建立数值计算模型,对增设的EPS缓冲层结构进行厚度优化和隧道结构稳定性研究。采用FLAC软件对开挖后的隧道初期支护、缓冲层和二次衬砌3种结构的力学状态进行多因素对比模拟分析,得到了一定工况下隧道支护结构的最优缓冲层厚度为40 cm。在现场采用该厚度的EPS缓冲层作为初衬与二衬间的支护结构,通过现场监测,缓冲层与二衬间的接触压力均小于规范预警值,表明支护结构优化方案可靠性较高。理论及应用研究均表明,衬砌结构中增加EPS缓冲层是富水膨胀性围岩隧道的有效支护形式和潜在灾害防治措施,该优化方案及其设计分析方法对类似工程均具有重要的推广应用价值。

关键词: 隧道工程, 膨胀岩, 膨胀本构, 衬砌结构优化, 缓冲层

Abstract: Generally, special requirements on the tunnel lining structure are needed for swelling rock. This study investigated the lining structure improvements for Lirang tunnel of Liangzhong-Chongqing highway composed of swelling rock. A new numerical simulation model was proposed based on the Noorany modified swelling model. Then we studied the optimum design of EPS buffer layer thickness and the stability of the tunnel structure by using the established model. FLAC software was employed to comparatively analyse mechanics states of three kinds of structures after excavation, including the primary support, buffer layer and secondary lining of the excavated tunnel. At last, the optimum thickness of buffer layer was obtained for the certain tunnel condition. In addition, the EPS buffer layer with a thickness of 40 cm was applied in practical supporting structure between the first and the second lining. The field monitoring results showed that the actual values of lining contact pressure were less than those of standard warning, which indicated that the reliability of optimum proposal for support structures was verified. Therefore, theoretical and applied studies demonstrate that the EPS buffer layer can be an effective improvement for lining structure and a control measure for preventing potential disasters of tunnels in rich-water and swelling rock. The optimisation scheme and the design method also have essential guidance for similar projects.

Key words: tunneling, swelling rock, swelling constitutive, lining optimum structure, buffer layer

中图分类号: 

  • TU 457

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