Study on swelling characteristics of mudstones considering adsorption-expansion analysis model
DING Xiuli，ZHAO Huameng，HUANG Shuling
(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China)
Abstract：Considering that swelling rocks such as mudstone and sandy mudstone have the characteristics of absorbing moisture to induce swelling，this paper divided the swelling deformation process of swelling rock into two stages，namely moisture absorption and expansion，and established a moisture absorption-swelling analysis model for swelling rock，deduced the control equation of the rock mass moisture diffusion，and proposed a humidity field calculation method considering the expansion effect induced by moisture absorption. According to the analysis theory and combined with the indoor experiment，the temporal and spatial diffusion law of humidity inside the rock mass and the influence characteristics of the humidity diffusion coefficient and the adsorption expansion coefficient were obtained during the expansion process. The results show that the internal humidity diffusion of rock mass has a significant temporal and spatial law，and the development trend of humidity with time is first slow，then rapid and then gentle. At the same time point，the humidity decreases with a negative exponential trend with the increase of the distance to the humidifying surface. When the adsorption expansion coefficient is constant，the relationship between the ultimate expansion deformation and the humidity diffusion coefficient conforms to the power exponential function，and when D/ is in the(0，1)，the ultimate expansion deformation increases more obviously. When the limit expansion deformation is constant，the relationship between adsorption expansion coefficient and humidity diffusion coefficient is negative exponential，and when D/ ＞2，the humidity diffusion coefficient has little effect on the adsorption expansion coefficient.
[1] 缪协兴，杨成永，陈至达. 膨胀岩体中的湿度应力场理论[J]. 岩土力学，1993，14(4)：49–55.(MIAO Xiexing，YANG Chengyong，CHEN Zhida. Theory of humidity stress field in swelling rock mass[J]. Rock and Soil Mechanics，1993，14(4)：49–55.(in Chinese))
[2] 朱珍德，张爱军，邢福东. 红山窑膨胀岩的膨胀和软化特性及模型研究[J]. 岩石力学与工程学报，2005，24(3)：389–393.(ZHU Zhende，ZHANG Aijun，XING Fudong. Research on swelling and strain softening model of swelling rock in Hongshanyao[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(3)：389–393.(in Chinese))
[3] 白 冰，李小春. 湿度应力场理论的证明[J]. 岩土力学 2007，28(1)：89–92.(BAI Bing，LI Xiaochun. Proof of humidity stress field theory[J]. Rock and Soil Mechanics，2007，28(1)：89–92.(in Chinese))
[4] 陈 钒，吴建勋，任 松，等. 基于湿度应力场理论的硬石膏膨胀试验研究[J]. 岩土力学 2018，39(8)：2 723–2 731.(CHEN Fan，WU Jianxun，REN Song，et al. The swelling tests of anhydrite based on the humidity stress field theory[J]. Rock and Soil Mechanics，2018，39(8)：2 723–2 731.(in Chinese))
[5] 何满潮，周 莉，李德建，等. 深井泥岩吸水特性试验研究[J]. 岩石力学与工程学报，2008，27(6)：1 113–1 120.(HE Manchao， ZHOU Li，LI Dejian，et al. Experimental research on hydrophilic characteristics of mudstone in deep well[J]. China Journal of Rock Mechanics and Engineering，2008，27(6)：1 113–1 120.(in Chinese))
[6] 杨春和，冒海军，王学潮，等. 板岩遇水软化的微观结构及力学特性[J]. 岩土力学，2006，27(12)：2 090–2 098.(YANG Chunhe，MAO Haijun，WANG Xuechao，et al. Study on variation of microstructure and mechanical properties of water-weakening slates[J]. Rock and Soil Mechanics，2006，27(12)：2 090–2 098.(in Chinese))
[7] 任 松，邓高岭，吴建勋，等. 石膏岩淡水浸泡软化试验研究[J]. 岩土力学，2017，38(4)：943–950.(REN Song，DENG Gaoling，WU Jianxun，et al. immersion tests on gypsum rocks using fresh water[J]. Rock and Soil Mechanics，2017，38(4)：943–950.(in Chinese))
[8] TANG S，YU C，TANG C. Numerical modeling of time-dependent development of the damage zone around a tunnel under high humidity conditions[J]. Tunnelling and Underground Space Technology，2018，76(6)：48–63.
[9] HOLTZ W G，GIBBS H J. Engineering properties of expansive clays[J]. Transactions of the American Society of Civil Engineers，1956，DOI：10.1061/TACEAT.0007325.
[10] EINSTEIN H. Suggested methods for laboratory testing of argillaceous swelling rock[J] International Journal of Rock Mechanics and Mining Science and Geomechanic Abstract，1989，26(5)：415–426.
[11] 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 relmion of swelling rock[J]. Journal of Hydraulic Engineering，2006，37(2)：195–199.(in Chinese))
[12] 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 Mining and Technology，2010，39(4)：511–515.(in Chinese))
[13] 任 松，欧阳汛，吴建勋，等. 含时间效应的硬石膏隧道弹–膨胀解析模型[J]. 浙江大学学报：工学版，2018，52(5)：896–905.(REN Song，OU Yangxun，WU Jianxun，et al. Elastic-swelling analytical model of anhydrite rock considering time-dependent effect[J]. Journal of Zhejiang University：Engineering Science，2018，52(5)：896–905.(in Chinese))
[14] HAWLADER B C，LEE Y N，LO K Y. Three-dimensional stress effects on time-dependent swelling behaviour of shaly rocks[J]. Canadian Geotechnical Journal，2003，(40)：501–511.
[15] 左清军，陈 可，谈云志，等. 基于时间效应的富水泥质板岩隧道围岩膨胀本构模型研究[J]. 岩土力学，2016，37(5)：1 357–1 364. (ZUO Qingjun，CHEN Ke，TAN Yunzhi，et al. A time-dependent constitutive model of the water-rich argillaceous slate surrounding a tunnel[J]. Rock and Soil Mechanics，2016，37(5)：1 357–1 364.(in Chinese))
[16] 孙 钧，张德兴，李成江. 渗水膨胀黏弹塑性围岩压力隧洞的耦合蠕变效应[J]. 同济大学学报：自然科学版，1984，12(2)：1–13.(SUN Jun，ZHANG Dexing，LI Chengjiang. Coupled-creep effect of pressure tunnels interacted with its water-osmotic swelling viscous elasto-plastic surrounding rocks[J]. Journal of Tongji University：Natural Science，1984，12(2)：1–13.(in Chinese))
[17] 王贤能，韩会增，文江泉. 膨胀岩边坡工程中膨胀与流变的耦合效应[J]. 地质灾害与环境保护，1997，8(4)：33–39.(WANG Xianneng，HAN Huizeng，WEN Jiangquan. The coupled effect of swell and rheology for the slope engineering of swelling rock[J]. Journal of Geological Hazards and Environment Preservation，1997，8(4)：33–39.(in Chinese))
[18] 钟志斌，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 time-dependent swelling characteristics of red-bed mudstone in Central Sichuan[J]. China Journal of Rock Mechanics and Engineering，2019，38(1)：76–86.(in Chinese))
[19] MADSEN F T. Suggested methods for laboratory testing of swelling rocks[J]. International Journal of Rock Mechanics and Mining Sciences，1999，(36)：291–306.
[20] ZHANG C L，WIECZOREK K，XIE M L. Swelling experiments on mudstones[J]. Journal of Rock Mechanics and Geotechnical Engineering，2010，2(1)：44–51.
[21] 黄宏伟，车 平. 泥岩遇水软化微观机理研究[J]. 同济大学学报：自然科学版，2007，35(7)：866–870.(HUANG Hongwei．CHE Ping. Research on micro-mechanism of softening and argillitization of mudstone[J]. Journal of Tongji University：Natural Science，2007，35(7)：866–870.(in Chinese))
[22] 曾仲毅，徐帮树，胡世权，陈 诚. 增湿条件下膨胀土隧道衬砌破坏数值分析[J]. 岩土力学，2014，35(3)：871–880.(ZENG Zhongyi，XU Bangshu，HU Shiquan，et al. Numerical analysis of tunnel liner failure mechanism in expansive soil considering water-increased state[J]. Rock and Soil Mechanics，2014，35(3)：871–880.(in Chinese))
[23] FREDLUND D G，RAHARDJO H. Soil mechanics for unsaturated soils[M]. New York：Wiley-Interscience，1993：1–364.
[24] 朱珍德，张爱军，张 勇，等. 基于湿度应力场理论的膨胀岩弹塑性本构关系[J]. 岩土力学，2004，25(5)：700–702.(ZHU Zhende，ZHANG Aijun，ZHANG Yong，et al. Elastoplastic constitutive law of swelling rock based on humidity stress field theory[J]. Rock and Soil Mechanics，2004，25(5)：700–702.(in Chinese))
[25] 朱凤贤，周翠英. 软岩遇水软化的耗散结构形成机制[J]. 地球科学—中国地质大学学报，2009，34(5)：525–532.(ZHU Fengxian，ZHOU Cuiying，et al. Forming mechanism of dissipative structure in the softening process of saturated soft rocks[J]. Earth Science—Journal of China University of Geosciences，2009，34(5)：525–532.(in Chinese))
[26] ZHOU Z L，CAI X，CAO W Z，et al. Influence of water content on mechanical properties of rock in both saturation and drying processes[J]. Rock Mechanics and Rock Engineering，2016，49： 3 009–3 025.
2021, Vol. 40 
