(1. Faculty of Electric Power Engineering，Kunming University of Science and Technology，Kunming，Yunnan 650500，China；
2. Yunnan Institute of Water and Hydropower Engineering Investigation，Design and Research，Kunming，Yunnan 650021，China)
Abstract：Sandy dolomite often has broken structure，with complex geological environment. It is prone to occur collapse，water inrush and sand gushing，induce the ground collapse and other disasters. Consequently，the construction of underground engineering in this stratum face several problems such as great excavation and supporting difficulties and high safety risk. There are five water conveyance tunnels passing through sandy dolomite strata in Yuxi section of central Yunnan water diversion project. In this paper，geological survey and analysis，microstructure testing and analysis were used to obtain the spatial distribution characteristics of sandy dolomite along the tunnels，with different sandy grades. Through geological survey in the construction period，case statistics of surrounding rock instability，theoretical analysis and induction，the influence factors of surrounding rock instability of sandy dolomite tunnel were summarized，the failure mechanism of surrounding rock was explored，and targeted prevention and controlling measures were put forward. The results show that：(1) The spatial distribution and sandification degree are closely related to the scale and distance of faults. In the vertical zonation，the sandification degree is gradually deepen from the surface to depth. Furthermore，strongly and severely sandy dolomite is the main surrounding rock mass in this project. (2) The influence factors of surrounding rock instability of sandy dolomite tunnel are mainly sandy grade，faults，groundwater condition and excavation disturbance. (3) Under anhydrous conditions，gravity-driven and stress-rock mass structure composite-driven surrounding rock collapse is prone to occur. In addition，under the condition of water-rich section，the failure modes are mainly water inrush and sand gushing，and the mechanism is mainly seepage instability. (4) Advanced geological prediction and dynamic risk evaluation of disaster occurrence are important measures for disaster prevention and controlling of sandy dolomite tunnels. The construction of slurry stop wall and consolidation grouting of surrounding rock are specific measures to deal with water and sand inrush. Construction experience still needs to be accumulated and summarized. The research results have certain guiding value for the disaster prevention and control of surrounding rock of sandy dolomite tunnel.
董家兴1，周志强1，赵永川2，米 健2，李建国2，柳晓宁2，李 超2，周伦顺1，沈桢洛1，沐红元2. 滇中引水工程砂化白云岩隧洞围岩地质特征与破坏机制[J]. 岩石力学与工程学报, 2024, 43(S1): 3464-3476.
DONG Jiaxing1，ZHOU Zhiqiang1，ZHAO Yongchuan2，MI Jian2，LI Jianguo2，LIU Xiaoning2，LI Chao2，ZHOU Lunshun1，SHEN Zhenluo1，MU Hongyuan2. Study on geological characteristics and failure mechanism of surrounding rock of sandy dolomite tunnel in water diversion project in central Yunnan. , 2024, 43(S1): 3464-3476.
[1] 董家兴，周志强，王志荣，等. Hoek-Brown强度准则在强烈砂化白云岩力学参数估算中的应用[J]. 长江科学院院报，2022，39(12)：21–25.(DONG Jiaxing，ZHOU Zhiqiang，WANG Zhirong，et al. Estimation of mechanical parameters of intense sandy dolomite based on Hoek-Brown strength criterion[J]. Journal Changjiang River Scientific Research Institute，2022，39(12)：21–25.(in Chinese))
[2] 何文秀. 美姑河坪头水电站厂址区白云岩砂化成因及其对工程影响研究[硕士学位论文][D]. 成都：成都理工大学，2008.(HE Wenxiu. Study on the genesis of dolomite sandification and its influence on engineering in Pingtou hydropower station site of Meigu River[M. S. Thesis][D]. Chengdu：Chengdu University of Technology，2008.(in Chinese))
[3] 张良喜. 白云岩岩溶砂化形成机制及其工程特性研究[博士学位论文][D]. 成都：成都理工大学，2012.(ZHANG Liangxi. Formation mechanism and engineering properties of dolomite karst sandification：a case study of Pingtou Hydropower Station at Meigu River，China[Ph. D. Thesis][D]. Chengdu：Chengdu University of Technology，2012.(in Chinese))
[4] 王朋朋，姚 静，姜 笠. 贵州白云岩砂化特征及其对隧道支护结构影响[J]. 贵州大学学报：自然科学版，2019，36(3)：44–48.(WANG Pengpeng，YAO Jing，JIANG Li. Guizhou dolomite sandification characteristics and its influence on tunnel support structure[J]. Journal of Guizhou University：Natural Science，2019，36(3)：44–48.(in Chinese))
[5] 李建国，沐红元，米 健. 砂化白云岩工程地质特性初步研究[C]// 水工隧洞技术应用与发展. [S. l.]：[s. n.]，2018：52–58.(LI Jianguo，MU Hongyuan，MI Jian. Preliminary study on engineering geological characteristics of sandy dolomite[C]// Application and Development of Hydraulic Tunnel Technology. [S. l.]：[s. n.]，2018：52–58.(in Chinese))
[6] 赵毅然. 滇中引水工程强烈～剧烈砂化白云岩物理力学特性研究[硕士学位论文][D]. 昆明：昆明理工大学，2021.(ZHAO Yiran. Study on the physical and mechanical properties of strong to severe sandy dolomite in the central Yunnan water diversion project[M. S. Thesis][D]. Kunming：Kunming University of Science and Technology，2021.(in Chinese))
[7] 李 东. 秀山隧道水文地质特征分析研究[J]. 铁道工程学报，2014，(4)：29–35.(LI Dong. Research on the hydrogeology characteristics of Xiushan tunnel[J]. Jouranl of Rallway Engineering Soclety，2014，(4)：29–35.(in Chinese))
[8] 王志杰，杜逸文，姜逸帆，等. 砂化白云岩地层隧道掌子面失稳机制研究[J]. 岩石力学与工程学报，2021，40(增2)：3 118–3 126. (WANG Zhijie，DU Yiwen，JIANG Yifan，et al. Study on instability mechanism of tunnel face in sandy dolomite strata [J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(Supp.2)：3 118–3 126. (in Chinese))
[9] 吴 凡. 富水砂化白云岩地层隧道掌子面灾变机制研究[硕士学位论文][D]. 成都：西南交通大学，2021.(WU Fan. Research on the catastrophe mechanism of tunnel face in water-rich sandy dolomite stratum[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2021.(in Chinese))
[10] ZHOU P，JIANG Y F，ZHOU F C，et al. Disaster mechanism of tunnel face with large section in sandy dolomite stratum[J]. Engineering Failure Analysis，2022，131：105905.
[11] JIANG Y F，ZHOU P，ZHOU F C，et al. Failure analysis and control measures for tunnel faces in water-rich sandy dolomite formations[J]. Engineering Failure Analysis，2022，138：106350.
[12] 陆记霞，刘向阳. 玉蒙铁路秀山隧道涌水涌砂地段施工技术[J]. 隧道建设，2009，29(3)：339–341.(LU Jixia，LIU Xiangyang. Construction techniques for water and sand gushing section in xiushan tunnel on Yuxi—Mengzi railway[J]. Tunnel Construction，2009，29(3)：339–341.(in Chinese))
[13] 杨文国，王才高，付廷达. 秀山隧道(出口)防涌水突砂施工配套技术[J]. 铁道建筑，2011，(6)：78–80.(YANG Wenguo，WANG Caigao，FU Tingda. Xiushan tunnel (exit) water and sand inrush prevention construction supporting technology[J]. Railway Construction，2011，(6)：78–80.(in Chinese))
[14] 赵 健. 玉蒙铁路秀山隧道构造挤压破碎富水带处理措施研究[J]. 铁道建筑，2015，(6)：54–57.(ZHAO Jian. Study on the treatment measures of the structural crushing and crushing water-rich zone in Xiushan tunnel of Yumeng railway[J]. Railway Construction，2015，(6)：54–57.(in Chinese))
[15] 张正全. 砂化白云岩突泥涌砂高风险隧道管束注浆质量控制[J]. 路基工程，2022，(3)：218–221.(ZHANG Zhengquan. Quality control of tube bundle grouting for high-risk tunnel with mud and sand inrush in sandy dolomite[J]. Subgrade Engineering，2022，(3)：218–221.(in Chinese))
[16] 刘新有，胡开富，张文涛，等. 滇中引水工程白云岩砂化隧洞涌水突泥处理研究[J]. 人民长江，2022，53(9)：102–108.(LIU Xinyou，HU Kaifu，ZHANG Wentao，et al. Study on the treatment of water and mud inrush in dolomite sandy tunnel of water diversion project in central Yunnan[J]. Yangtze River，2022，53(9)：102–108.(in Chinese))
[17] 欧阳振华，彭 瑞，张同俊，等. 软岩巷道围岩卸荷破坏力学模型及影响因素分析[J]. 煤炭科学技术，2020，48(2)：51–58.(OUYANG Zhenhua，PENG Rui，ZHANG Tongjun，et al. Analysis on mechanical model and impact factors of unloading failure of rock surrounding in soft rock roadway[J]. Coal Science and Technology，2020，48(2)：51–58.(in Chinese))
[18] 马 岚，段汝健，张开雄. 锦屏一级水电站地下厂房围岩破坏影响因素分析与施工技术研究[J]. 隧道建设，2013，33(8)：633–644.(MA Lan，DUAN Rujian，ZHANG Kaixiong. Analysis on factors affecting failure of surrounding rock of underground plant of Jinping stage I hydropower station and researches on construction technologies[J]. Tunnel Construction，2013，33(8)：633–644.(in Chinese))
[19] 林国涛，宋瑞刚. 岩溶隧道突泥机制与防治技术研究[J]. 隧道建设，2012，(2)：169–174.(LIN Guotao，SONG Ruigang. Study on mechanisms of mud bursting in tunneling in karst areas and its prevention and control[J]. Tunnel Construction，2012，(2)：169–174.(in Chinese))
[20] 陈骏骏. 岩溶隧道涌突水灾害风险评价研究[硕士学位论文][D]. 长春：吉林大学，2016.(CHEN Junjun. Study of risk assessment of inrush water hazards in karst Tunnels[M. S. Thesis][D]. Changchun：Jilin University，2016.(in Chinese))
[21] 刘 高，张帆宇，李新召，等. 木寨岭隧道大变形特征及机制分析[J]. 岩石力学与工程学报，2005，24(增2)：5 521–5 526.(LIU Gao，ZHANG Fanyu，LI Xinzhao，et al. Large deformation characteristics and mechanism analysis of Muzhailing tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp.2)：5 521–5 526.(in Chinese))
[22] 王嘉琛，张顶立，孙振宇，等. 水平互层围岩隧道破坏机制及其范围预测模型[J]. 力学学报，2022，54(10)：2 835–2 849.(WANG Jiachen，ZHANG Dingli，SUN Zhenyu，et al. Failure mechanism and scope prediction model of horizontal interbedded surrounding rock tunnel[J]. Chinese Journal of Theoretical and Applied Mechanics，2022，54(10)：2 835–2 849.(in Chinese))
[23] 符银昌，赵诗茹，陈志超，等. 软岩偏压隧道洞口段变形破坏机制及防治措施[J]. 施工技术，2013，42(7)：89–92.(FU Yinchang，ZHAO Shiru，CHEN Zhichao，et al. Deformation failure mechanism and prevention measures of soft rock bias tunnel portal section[J]. Construction Technology，2013，42(7)：89–92.(in Chinese))
[24] 郭小龙，谭忠盛，李 磊，等. 高地应力陡倾层状软岩隧道变形破坏机制分析[J]. 土木工程学报，2017，50(增2)：38–44.(GUO Xiaolong，TAN Zhongsheng，LI Lei，et al. Analysis of deformation and failure mechanism of steeply inclined layered soft rock tunnel in high geostress[J]. Journal of Civil Engineering，2017，50(Supp.2)：38–44.(in Chinese))
[25] 孙会想. 大埋深、高地应力地下洞室群围岩破坏机制及应对措施研究[J]. 现代隧道技术，2019，56(3)：8–17.(SUN Huixiang. On failure mechanism of surrounding rocks of the deep-buried underground cavern group under high geostress and its countermeasures[J]. Modern Tunnelling Technology，2019，56(3)：8–17.(in Chinese))
[26] 董家兴，张晟玮，程 娟，等. 模糊层次分析法在白云岩砂化等级划分中的应用[J]. 长江科学院院报，2023，40(2)：109–114.(DONG Jiangxing，ZHANG Shengwei，CHENG Juan，et al. Application of fuzzy AHP method to classification of dolomite sandification level[J]. Journal Changjiang River Scientific Research Institute，2023，40(2)：109–114.(in Chinese))
[27] 翁贤杰. 富水断层破碎带隧道突水突泥机制及注浆治理技术研究[硕士学位论文][D]. 济南：山东大学，2014.(WENG Xianjie. Study on inrush of water and mud mechanism and grouting control technology in water-rich fault fracture zone of tunnel[M. S. Thesis][D]. Jinan：Shandong University，2014.(in Chinese))
[28] 董家兴，徐光黎，李志鹏，等. 高地应力条件下大型地下洞室群围岩失稳模式分类及调控对策[J]. 岩石力学与工程学报，2014，33(11)：2 161–2 170.(DONG Jiaxing，XU Guangli，LI Zhipeng，et al. Classlfication of failure modes and controlling measures for surrounding rock of large-scale caverns with high ceostress[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(11)：2 161–2 170.(in Chinese))
[29] 郭佳奇，乔春生. 岩溶隧道掌子面突水机制及岩墙安全厚度研究[J]. 铁道学报，2012，(3)：105–111.(GUO Jiaqi，QIAO Chunsheng. Study on water-inrush mechanism and safe thickness of rock wall of karst tunnel face[J]. Journal of the China Railway Society，2012，(3)：105–111.(in Chinese))
2024, Vol. 43 
