Abstract：Currently，the continuous upheaval deformation of high-speed railway subgrade during operation period in the region of red-bed soft rock mass has become a key factor to hinder the development of high-speed railways in China. In order to reveal time-dependent upheaval mechanisms of red-bed rock subgrade，and taking the typical upheaval of a deep cut red-bed soft rock subgrade in Southwest China as the research object，the in-situ engineering geology and hydrogeology conditions and the crustal stresses were surveyed，and the swelling and creep tests of red-bed soft rock mass under different hydraulic conditions were conducted. A layered deformation model of red-bed rock subgrade was built based on the time-dependent swelling and hydro-mechanical coupling characteristics，and the upheaval deformation mechanism and characteristics of the subgrade in short，medium and long terms were systematically analyzed. The results show that the red-bed mudstone inter-bedded with thin sandstone in the upheaval subgrade presents sub-horizontal，that the excavation normal unloading leads to the relaxation of micro-cracks in the shallow rock mass while the deep rock mass keeps intact，and that the horizontal stress of the subgrade increases obviously，resulting in significant structure effect of the subgrade deformation. Under the condition of lateral constraint and axial unconstraint，the time-dependent water-absorption deformation of the red-bed mudstone is related to its lithology and structural characteristics. It is also shown that the red-bed mudstone presents a three-phase creep characteristic under low stress condition and the creep strain ratio increases with decreasing the axial stress. Under the hydro-mechanical coupling condition，the creep property of the red-bed mudstone is more significant，and both the creep upheaval strain and the duration time increase more obviously for large unloading. The creep time lasts longer while the total creep strain decreases under the moisture-mechanical coupling condition. Based on the deformation mechanisms of different layered rock masses，the red-bed soft rock subgrade is divided into atmospheric influence layer(C1)，moisture-mechanical coupling deformation layer(C2)，hydro-mechanical coupling deformation layer(C3) and hydro-mechanical coupling confining layer(C4). The short-term，medium-term and long-term deformations of the subgrade are mainly contributed by C1，C3 and C4，and C2 respectively. The results can provide theoretical foundation and reference for risk assessment and forecast and the design of engineering control measures of time-dependent upheaval deformation of high-speed railway subgrade in the region of red-bed soft rock mass.
[1] 杨宗才，张俊云，周德培. 红层泥岩边坡快速风化特性研究[J]. 岩石力学与工程学报，2006，25(2)：275–283.(YANG Zongcai，ZHANG Junyun，ZHOU Depei. Study on fast weathering characteristics of red bed mudstone slope[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(2)：275–283.(in Chinese))
[2] 张俊云，周德培. 红层泥岩边坡快速风化规律[J]. 西南交通大学学报，2006，41(1)：74–79.(ZHANG Junyun，ZHOU Depei. Fast weathering law of red-bed mudstone slope[J]. Journal of Southwest Jiaotong University，2006，41(1)：74–79.(in Chinese))
[3] 潘 艺，刘 镇，周翠英. 红层软岩遇水崩解特性试验及其界面模型[J]. 岩土力学，2017，38(11)：3 231–3 239.(PAN Yi，LIU Zhen，ZHOU Cuiying. Experimental study of disintegration characteristics of red-bed soft rock within water and its interface model[J]. Rock and Soil Mechanics，2017，38(11)：3 231–3 239.(in Chinese))
[4] 吴道祥，刘宏杰，王国强. 红层软岩崩解性室内试验研究[J]. 岩石力学与工程学报，2010，29(增2)：4 173–4 179.(WU Daoxiang，LIU Hongjie，WANG Guoqiang. Laboratory experimental study of slaking characteristics of red-bed soft rock[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：4 173–4 179.(in Chinese))
[5] 刁心宏，杨守兴，冒小波. 不同温湿环境下泥岩吸水及膨胀特性的试验研究[J]. 华东交通大学学报，2017，34(3)：14–18.(DIAO Xinhong，YANG Shouxing，MAO Xiaobo. Experimental study on water absorption and expansion characteristics of mudstone under conditions of different temperature and humidity[J]. Journal of East China Jiaotong University，2017，34(3)：14–18.(in Chinese))
[6] 胡文静，丁 瑜，夏振尧，等. 重庆地区红层泥岩侧限膨胀性能试验研究[J]. 防灾减灾工程学报，2015，35(5)：607–611.(HU Wenjing，DING Yu，XIA Zhenyao，et al. Experimental study on confined swelling characteristic of redbed mudstone in Chongqing[J]. Journal of Disaster Prevention and Mitigation Engineering，2015，35(5)：607–611.(in Chinese))
[7] 季 明，高 峰，高亚楠，等. 灰质泥岩遇水膨胀的时间效应研究[J]. 中国矿业大学学报，2010，39(4)：511–515.(JI Ming，GAO Feng，GAO Yanan，et al. Study on time-dependent effect of calcareous mudstone expansion after infiltrated with water[J]. Journal of China University of Ming and Technology，2010，39(4)：511–515.(in Chinese))
[8] 刘晓丽，王思敬，王恩志，等. 含时间效应的膨胀岩膨胀本构关系[J]. 水利学报，2006，37(2)：195–199.(LIU Xiaoli，WANG Sijing，WANG Enzhi，et al. Study on time-dependent swelling constitute relation of swelling rock[J]. Journal of Hydraulic Engineering，2006，37(2)：195–199.(in Chinese))
[9] 魏永幸，张仕忠，甘 鹰，等. 四川盆地红层泥岩的基本特性和膨胀性及软化的试验研究[J]. 工程勘察，2010，(增1)：61–68.(WEI Yongxing，ZHANG Shizhong，GAN Ying，et al. Experimental study on the essential feature and swelling and softening characteristics of red-bed mudstone in Sichuan basin[J]. Geotechanical Investigation and Survrying，2010，(Supp.1)：61–68.(in Chinese))
[10] 钟志彬，李安洪，邓荣贵，等. 川中红层泥岩时效膨胀变形特性试验研究[J]. 岩石力学与工程学报，2019，38(1)：76–86.(ZHONG Zhibin，LI Anhong，DENG Ronggui，et al. Experimental study on the timed-dependent swelling characteristics of red-bed mudstone in Central Sichuan[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(1)：76–86.(in Chinese)).
[11] 谌文武，原鹏博，刘小伟. 分级加载条件下红层软岩蠕变特性试验研究[J]. 岩石力学与工程学报，2009，28(增1)：3 076–3 081.(CHEN Wenwu，YUAN Pengbo，LIU Xiaowei. Study on creep properties of red-bed soft rock under step load[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(Supp.1)：3 076–3 081.(in Chinese))
[12] 巨能攀，黄海峰，郑 达，等. 考虑含水率的红层泥岩蠕变特性及改进伯格斯模型[J]. 岩土力学，2016，37(增2)：67–74.(JU Nengpan，HUANG Haifeng，ZHENG Da，et al. Improved burgers model for creep characteristics of red bed mudstone considering water content[J]. Rock and Soil Mechanics，2016，37(Supp.2)：67–74.(in Chinese))
[13] 刘小伟，谌文武，张帆宇，等. 新近系红层软岩流变特性试验研究[J]. 中国沙漠，2012，32(5)：1 268–1 274.(LIU Xiaowei，CHEN Wenwu，ZHANG Fanyu，et al. Experimental study on rheological properties of neogene red-bed soft rock[J]. Journal of Desert Research，2012，32(5)：1 268–1 274.(in Chinese))
[14] 王闫超. 巴东组泥岩蠕变力学特性及边坡变形与支护的时效性研究[博士学位论文][D]. 武汉：中国地质大学，2018.(WANG Yanchao. Study on the creep mechanical properties of Badong formation mudstone and its application on the time-dependent deformation analysis of the slope[Ph. D. Thesis][D]. Wuhan：China University of Geosciences，2018.(in Chinese))
[15] 闫云明，李恒乐，郭士礼. 紫红色泥岩三轴蠕变力学特性试验研究[J]. 长江科学院院报，2017，34(6)：88–92.(YAN Yunming，LI Hengle，GUO Shili. Experimental study on creep mechanical characteristics of Aubergine mudstone under three-dimensional stress conditions[J]. Journal of Yangtze River Scientific Research Institute，2017，34(6)：88–92.(in Chinese))
[16] 杨淑碧，徐 进，董孝璧. 红层地区砂泥岩互层状斜坡岩体流变特性研究[J]. 地质灾害与环境保护，1996，7(2)：12–24.(YANG Shubi，XU Jin，DONG Xiaobi. Rheological feature of slope rockmass composed of alternating beds of sandstone and mudstone in red beds area[J]. Journal of Geologcial Hazards and Environment Preservation，1996，7(2)：12–24.(in Chinese))
[17] JIAN W，WANG Z，YIN K. Mechanism of the Anlesi landslide in the Three Gorges Reservoir，China[J]. Engineering Geology，2009，108(1–2)：86–95.
[18] 叶世斌. 川渝地区红层软岩路堑边坡变形机制及对策[J]. 高速铁路技术，2015，6(5)：67–72.(YE Shibin. Deformation mechanism and countermeasures of red-bed soft cutting slopes in Sichuan and Chongqing area[J]. High Speed Railway Technology，2015，6(5)：67–72.(in Chinese))
[19] 程 强，周永江，黄绍槟. 近水平红层开挖边坡变形破坏特征[J]. 岩土力学，2004，25(8)：1 311–1 314.(CHENG Qiang，ZHOU Yongjiang，HUANG Shaobin. Distortion and failure character of excavation slope in approximate level beds[J]. Rock and Soil Mechanics，2004，25(8)：1 311–1 314. (in Chinese))
[20] 胡厚田，赵晓彦. 中国红层边坡岩体结构类型的研究[J]. 岩土工程学报，2006，28(6)：689–694.(HU Houtian，ZHAO Xiaoyan. Studies on rockmass structure in slope of red bed in China[J]. Chinese Journal of Geotechnical Engineering，2006，28(6)：689–694.(in Chinese))
[21] 卢海峰，陈从新，袁从华，等. 巴东组红层软岩缓倾顺层边坡破坏机制分析[J]. 岩石力学与工程学报，2010，29(增2)：3 569–3 577. (LU Haifeng，CHEN Congxin YUAN Conghua，et al. Analysis of failure mechanism of Badong red bed soft rock gently inclined bedding slope[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：3 569–3 577.(in Chinese))
[22] 骆银辉，朱春林，李俊东. 云南红层边坡变形破坏机制及其危害防治研究[J]. 岩土力学，2003，24(5)：836–839.(LUO Yinhui，ZHU Chunlin，LI Jundong. Research for distortion-destruction mechanism of slopes of red strata in Yunnan Province and their hazard control[J]. Rock and Soil Mechanics，2003，24(5)：836–839.(in Chinese))
[23] 王智猛. 红层泥岩及其改良土填筑高速铁路路基适应性及工程技术研究[博士学位论文][D]. 成都：西南交通大学，2009.(WANG Zhimeng. Study on applicability and technology for filling subgrade using red-mudstone and improved soil in high-speed railway[Ph. D. Thesis][D]. Chengdu：Southwest Jiaotong University，2009.(in Chinese))
[24] 魏永幸. 利用红层泥岩填筑高速铁路路基技术的试验研究[J]. 铁道工程学报，2009，(12)：39–43.(WEI Yongxing. Experimental study on the technology for filling the subgrade of hight-speed railway with red rock[J]. Journal of Railway Engineering Society，2009，(12)：39–43.(in Chinese))
[25] 蒋关鲁，房立凤，王智猛，等. 红层泥岩路基填料动强度和累积变形特性试验研究[J]. 岩土工程学报，2010，32(1)：124–129.(JIANG Guanlu，FANG Lifeng，WANG Zhimeng，et al. Experimental study on dynamic strength and accumulated deformation characteristics of red-mudstone filling[J]. Chinese Journal of Geotechnical Engineering，2010，32(1)：124–129.(in Chinese))
[26] 王智猛，蒋关鲁，魏永幸. 红层泥岩填料物理力学特性的试验研究[J]. 路基工程，2006，(5)：86–88.(WANG Zhimeng，JIANG Guanlu，WEI Yongxin. Experimental study on physical and mechanical properties of red-mudstone filling[J]. Subgrade Engineering，2006，(5)：86–88.(in Chinese))
[27] 徐 鹏，蒋关鲁，任世杰，等. 红层泥岩及其改良填料路基动力响应试验研究[J]. 岩土力学，2019，40(2)：678–683.(XU Peng，JIANG Guanlu，REN Shijie，et al. Test study on dynamic response of subgrade with red mudstone and improved red mudstone[J]. Rock and Soil Mechanics，2019，40(2)：678–683.(in Chinese))
[28] 杨吉新，马旭超，刘前瑞. 关于成渝高铁路基上拱问题的探讨[J]. 铁道建筑，2016，(8)：112–115.(YANG Jixin，MA Xuchao，LIU Qianrui. Exploring on subgrade swelling of Chengdu—Chongqing high speed railway[J]. Railway Engineering，2016，(8)：112–115.(in Chinese))
[29] 吴沛沛. 基于流变的高速铁路深挖路堑长期上拱变形数值分析[J]. 路基工程，2019，(1)：135–139.(WU Peipei. Numerical analysis on the long-term upheaval deformation of high-speed railway deep cutting based on rheology[J]. Subgrade Engineering，2019，(1)：135–139.(in Chinese))
[30] 王 剑. 兰新高速铁路路基上拱原因分析及整治措施[J]. 路基工程，2015，(1)：205–209.(WANG Jian. Cause analysis on subgrade arching of Lanzhou—Xinjiang high-speed railway and the control measures[J]. Subgrade Engineering，2015，(1)：205–209.(in Chinese))
[31] 程 康，杨有海，马治国，等. 兰新高铁玉门段路基泥岩膨胀病害治理研究[J]. 兰州工业学院学报，2017，24(3)：50–53.(CHEN Kang，YANG Youhai，MA Zhiguo，et al. The study on disease control ｒesulting from expansion of mudstones and subgrade in Yumen Section of Lanzhou—Xinjiang high-speed railway[J]. Journal of Lanzhou Institute of Technology，2017，24(3)：50–53.(in Chinese))
[32] 王鹏程，尧俊凯，陈 锋，等. 无砟轨道路基上拱原因试验研究[J]. 铁道建筑，2018，58(1)：43–46.(WANG Pengcheng，YAO Junkai，CHEN Fen，et al. Experimental study on heaving cause of ballastless track subgrade[J]. Railway Engineering，2018，58(1)：43–46.(in Chinese))
[33] 王 冲，王起才，张戎令，等. 无砟轨道高速铁路路基上拱病害成因分析[J]. 科学技术与工程，2017，17(12)：252–256.(WANG Chong，WANG Qicai，ZHANG Rongling，et al. Analysis of arch disease of ballastless track high-speed railway[J]. Science Technology and Engineering，2017，17(12)：252–256.(in Chinese))
[34] 胡安华，蒋关鲁，王智猛，等. 高速铁路路基红层泥岩填料力学特性试验研究[J]. 铁道工程学报，2008，(2)：21–25.(HU Anhua，JIANG Guanlu，WANG Zhimeng，et al. Experimental research on mechanical characteristics of red rock filling for subgrade of high-speed railway[J]. Journal of Railway Engineering Society，2008，(2)：21–25.(in Chinese))
[35] 殷跃平，胡瑞林. 三峡库区巴东组_T_2b_紫红色泥岩工程地质特征研究[J]. 工程地质学报，2004，12(2)：124–135.(YIN Yueping，HU Ruilin. Engineering geological characteristics of purplish-red mudstone of middle tertiary formation at the three gorges reservoir[J]. Journal of Engineering Geology，2004，12(2)：124–135.(in Chinese))
[36] International Society for Rock Mechanics and Rock Engineering. Characterisation of swelling rock[M]. Oxford：Pergamon Press，1983：9–10.
[37] DOOSTMOHAMMADI R，MOOSAVI M，MUTSCHLER T，et al. Influence of cyclic wetting and drying on swelling behavior of mudstone in south west of Iran[J]. Environmental Geology，2009，58(5)：999–1 009.
[38] 孙 钧，钦亚洲，李 宁. 软岩隧道挤压型大变形非线性流变属性及其锚固整治技术研究[J]. 隧道建设，2019，39(3)：337–347.(SUN Jun，QIN Yazhou，LI Ning. Nonlinear rheological features and anchoring technology for soft rock tunnel with large squeezing deformation[J]. Tunnel Construction，2019，39(3)：337–347.(in Chinese))
[39] 吴 迪. 软岩洞室施工期流变特性分析[硕士学位论文][D]. 成都：西南交通大学，2018.(WU Di. Analysis on rheological behaviors of soft rock tunnels during construction[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2018.(in Chinese))
[40] 王华宁，宋 飞，蒋明镜. 流变岩体中支护圆形隧道施工过程的时效理论解[J]. 同济大学学报：自然科学版，2016，44(12)：1 835–1 844. (WANG Huaning，SONG Fei，JIANG Mingjing. Analytical solutions for the construction of circular tunnel accounting for time-dependent characteristic of the rheological rock[J]. Journal of Tongji University：Naturnal Science，2016，44(12)：1 835–1 844.(in Chinese))
[41] 王志俭. 万州区红层岩土流变特性及近水平地层滑坡成因机制研究[博士学位论文][D]. 武汉：中国地质大学，2008.(WANG Zhijian. Rheological experimental study and mechanism research on gentle- dipped landslides of Jurassic red strata in Wangzhou city[Ph. D. Thesis][D]. Wuhan：China University of Geosciences，2008.(in Chinese))
[42] 范秋雁，阳克青，王渭明. 泥质软岩蠕变机制研究[J]. 岩石力学与工程学报，2010，29(8)：1 555–1 561.(FAN Qiuyan，YANG Keqing，WANG Weiming. Study of creep mechanism of argillaceous soft rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(8)：1 555–1 561.(in Chinese))
2020, Vol. 39 
