Abstract: For the longitudinal cracks on the top surface of inverted arch of a loess tunnel which located at Lanzhou South Ring Expressway, the mechanism and development process of the tunnel floor heave were analyzed by means of in-situ deformation monitoring and numerical simulation. Through the observation of the vertical settlement on the top surface of the inverted arch filling, and the simulation results with the focus on the stress of the uneven settlement of the inverted arch, we found the main cause of the cracks was that the tensile stress in the middle of the inverted arch exceeded the tensile strength of the concrete. Combining the analysis results and the actual working conditions, we formulated the construction scheme as locking anchor pipes and reinforced concrete pavement. And the effectiveness of the scheme had been verified in practice. The research results not only guided the field construction, but also provided a basis for optimizing the support system of loess tunnel, and also a reference for similar engineering constructions.
张建,梁庆国,王永刚,庞小冲. 黄土隧道底鼓机理分析与防治技术[J]. 隧道与地下工程灾害防治, 2020, 2(1): 84-90.
ZHANG Jian, LIANG Qingguo, WANG Yonggang, PANG Xiaochong. Deformation mechanism and prevention of floor heave in loess tunnel. Hazard Control in Tunnelling and Underground Engineering, 2020, 2(1): 84-90.
[1] 梁庆国, 李洁, 李德武, 等. 黄土隧道围岩分级研究的若干问题[J]. 岩土工程学报, 2011, 33(增刊1): 177-183. LIANG Qingguo, LI Jie, LI Dewu, et al. Some problems on surrounding rock classification of loess tunnels[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(Suppl.1): 177-183. [2] 王明年, 翁汉民, 李志业. 隧道仰拱的力学行为研究[J]. 岩土工程学报, 1996,18(1): 46-53. WANG Mingnian, WENG Hanmin, LI Zhiye. Study on the mechanic behavior of tunnel invert[J].Chinese Journal of Geotechnical Engineering, 1996, 18(1): 46-53. [3] KUMASAKA H. Numerical computation of support characteristic curves for use in tunnel support design and their application to the characteristic curve method[J]. Int J JCRM, 2007, 3(1): 1-6. [4] 王明年, 关宝树.仰拱对维护隧道整体稳定的力学行为的研究[J]. 隧道建设, 1993(4): 11-18. WANG Mingnian, GUAN Baoshu. Study on the mechanics behaviour of tunnel invert to maintain tunnel stability[J]. Tunnel Construction, 1993(4): 11-18. [5] 严松宏, 马丽娜, 欧尔峰.仰拱对隧道安全性影响研究[J]. 兰州交通大学学报, 2012,31(3): 5-7. YAN Songhong, MA Lina, OU Erfeng. Study on the tunnel safety based on the impact of inverted arch[J]. Journal of Lanzhou Jiaotong University, 2012, 31(3): 5-7. [6] 康红普. 巷道底鼓的挠曲效应及卸压效果的分析[J]. 煤炭学报,1992, 17(1): 37-52. KANG Hongpu. Analysis of bend domino effect of floor heave and stress relieved effect[J]. Journal of China Coal Society, 1992, 17(1): 37-52. [7] 李树清.葛泉矿软岩大巷底鼓机理及控制研究[D].长沙: 中南大学, 2004. LI Shuqing. Study of mechanism and control of soft rock roadway floor heave in Gequan coal mine[D]. Changsha: Central South University, 2004. [8] 王洪立,王玉白,胡冠英.巷道底臌的原因及防治措施[J].煤矿安全, 2005, 36(8): 43-45. WANG Hongli, WANG Yubai, HU Guanying.Reasons and prevention measures for laneway floor heave[J]. Safety in Coal Mines, 2005, 36(8): 43-45. [9] 谷平军.底鼓对深部软岩变形的影响及控制对策[J].华北科技学院学报, 2010, 7(2): 23-25. GU Pingjun. The influence of floor heaving to deep soft rock deformation and control measures[J].Journal of North China Institute of Science and Technology, 2010, 7(2): 23-25. [10] 汪洋,唐雄俊,谭显坤,等.云岭隧道底鼓机理分析[J]. 岩土力学, 2010, 31(8): 2530-2534. WANG Yang, TANG Xiongjun, TAN Xiankun, et al. Mechanism analysis of floor heave in Yunling Tunnel[J]. Rock and Soil Mechanics, 2010, 31(8): 2530-2534. [11] 钟祖良,刘新荣,王道良,等.桃树垭隧道底鼓发生机理与防治技术研究[J].岩土工程学报, 2012, 34(3): 471-476. ZHONG Zuliang, LIU Xinrong, WANG Daoliang, et al.Mechanism analysis of floor heave in Taoshuya Tunnel and its prevention techniques[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(3): 471-476. [12] 薛晓辉,张军,宿钟鸣,等.武都西隧道底鼓机理及防治措施研究[J].公路工程, 2015, 40(5): 124-128. XUE Xiaohui, ZHANG Jun, SU Zhongming, et al. Study on mechanism and prevention measures of floor heave in Wuduxi Tunnel[J]. Highway Engineering, 2015, 40(5): 124-128. [13] 胡胜强.某高速公路隧道仰拱底鼓原因分析及处置方案数值模拟[J].路基工程, 2015,180(3): 238-242. HU Shengqiang. Reason analysis and numerical simulation for control scheme of inverted arch floor heave of highway tunnel[J]. Subgrade Engineering, 2015, 180(3): 238-242. [14] LEE C H, WANG T T. Invert anomalies in operational rock tunnels: appearance, causes, and countermeasures[J]. Journal of Performance of Constructed Facilities, 2016, 30(3): 04015048. [15] 王克俊. 五子山隧道仰拱开裂综合处置方案研究[J]. 城市道桥与防洪, 2019(5): 228-231. WANG Kejun. Study on comprehensive treatment scheme of inverted arch cracking in Wuzishan Mountain Tunnel[J]. Urban Roads Bridges & Flood Control, 2019(5): 228-231. [16] 杜明庆,张顶立,王旭春,等.大断面隧道仰拱底鼓破坏模式[J].中国公路学报,2018,31(10):292-301,358. DU Mingqing, ZHANG Dingli, WANG Xuchum, et al. Failure modes of floor heave in large section tunnel invert[J]. China Journal of Highway and Transport, 2018, 31(10): 292-301,358. [17] 高登.某高速公路隧道底鼓原因分析及处置措施研究[J].公路, 2019, 64(3): 326-331. GAO Deng. Cause analysis and treatment measures of tunnel floor heave in an expressway[J]. Highway, 2019, 64(3): 326-331. [18] 白凤龙,朱文中.兰州西津村黄土剖面及磁性年代的确定[J].西安地质学院学报, 1986, 8(2): 71-75. BAI Fenglong, ZHU Wenzhong. Determination of loess section and magnetic age in Xijincun, Lanzhou[J]. Journal of Xi'an Institute of Geology, 1986, 8(2): 71-75. [19] 李国良,邵生俊,靳宝成, 等.黄土隧道地基的湿陷性问题研究[J].铁道工程学报, 2015,32(12): 12-16,50. LI Guoliang, SHAO Shengjun, JIN Baocheng, et al. Research on the problems of collapsibility of loess tunnel foundation[J]. Journal of Railway Engineering Society, 2015, 32(12): 12-16,50. [20] 翁效林, 王俊, 王立新, 等.黄土地层浸水湿陷对地铁隧道影响试验研究[J]. 岩土工程学报, 2016, 38(8): 1374-1380. WENG Xiaolin, WANG Jun, WANG Lixin, et al. Experimental research on influence of loess collapsibility on subway tunnels[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(8): 1374-1380. [21] 邓国华, 邵生俊, 陶虎, 等.锁脚锚管对土质隧道围岩变形和支护内力的影响研究[J]. 土木工程学报, 2010, 43(1): 108-113. DENG Guohua, SHAO Shengjun, TAO Hu, et al. A study of the effects of locking tremies on the internal force of tunnel support and the deformation of surrounding soil[J]. China Civil Engineering Journal, 2010, 43(1): 108-113.
2020, Vol. 2 
