|
|
|
| Unified elastoplastic constitutive model for clayey and sandy energy soils |
| ZHAO Yapeng1，2，3，LIU Lele3，4，KONG Liang1，2，SANG Songkui1，2，WANG Xing1，2，LIU Jiaqi1 |
| (1. School of Science，Qingdao University of Technology，Qingdao，Shandong 266520，China；2. School of Civil Engineering，Qingdao University of Technology，Qingdao，Shandong 266520，China；3. Qingdao Institute of Marine Geology，Key Laboratory of Gas Hydrate，Ministry of Natural Resources，Qingdao，Shandong 266237，China；4. Evaluation and
Detection Technology Laboratory of Marine Mineral Resources，Qingdao National Laboratory for Marine Science
and Technology，Qingdao，Shandong 266237，China) |
|
|
|
|
Abstract At present，triaxial tests of energy soils and their constitutive models are mostly based on coarse-grained reservoirs such as sandy soils. There are few tests and constitutive simulations of clayey-silty energy soils，and it is even rarer to have a constitutive model that can uniformly describe clayey and sandy energy soils. In this paper，triaxial tests of clayey-silty energy soils were firstly carried out，and the mechanical properties of energy soils were deeply summarized based on previous achievements. Then，under the framework of unified hardening model for clays and sands(CSUH)，considering the special mechanical characteristics of energy soils，the compressibility parameter related to hydrate saturation was constructed to describe the compression characteristics of energy soils. The cementation factor and dilatancy factor were introduced to reflect the cohesive strength and dilatancy effect respectively. The shear state of energy soils was reflected by state parameter，and an elastoplastic constitutive model which could describe clayey and sandy energy soils in a unified way was established by combining the non-associated flow rule. The verification program of the model was compiled，and the validity of the constitutive model was verified by several groups of triaxial tests of this paper and other scholars. The results show that the established elastic-plastic constitutive model can uniformly describe the shear characteristics of clayey fine-grained and sandy coarse-grained energy soils. It can effectively reflect the mechanical characteristics of energy soils such as strain hardening and softening，shear contraction and dilatation. It also has a good prediction effect on the influence of hydrate saturation and effective confining pressure.
|
|
|
|
|
|
| [1] ENGLEZOS P. Clathrate hydrates[J]. Industrial and Engineering Chemistry Research，1993，32(7)：1 251–1 274.
[2] LI Y，LIU L，JIN Y，et al. Characterization and development of marine natural gas hydrate reservoirs in marine clayey-silt reservoirs：A review and discussion[J]. Advances in Geo-Energy Research，2021，5(1)：75–86.
[3] 赵亚鹏，刘乐乐，孔 亮，等. 含天然气水合物土微观力学特性研究进展[J]. 力学学报，2021，53(8)：2 119–2 140.(ZHAO Yapeng，LIU Lele，KONG Liang，et al. Advances in micromechanical properties of hydrate-bearing soils[J]. Chinese Journal of Theoretical and Applied Mechanics，2021，53(8)：2 119–2 140.(in Chinese))
[4] 蒋明镜，刘 俊，周 卫，等. 一个深海能源土弹塑性本构模型[J]. 岩土力学，2018，39(4)：1 153–1 158.(JIANG Mingjing，LIU Jun，ZHOU Wei，et al. An elasto-plastic constitutive model for methane hydrate bearing sediments[J]. Rock and Soil Mechanics，2018，39(4)：1 153–1 158.(in Chinese))
[5] SULTAN N，COCHONAT P，FOUCHER J P，et al. Effect of gas hydrates melting on seafloor slope instability[J]. Marine Geology，2004，213(1)：379–401.
[6] 韦昌富，颜荣涛，田慧会，等. 天然气水合物开采的土力学问题:现状与挑战[J]. 天然气工业，2020，40(8)：116–132.(WEI Changfu，YAN Rongtao，TIAN Huihui，et al. Geotechnical problems in exploitation of natural gas hydrate：Status and challenges[J]. Natural Gas Industry，2020，40(8)：116–132.(in Chinese))
[7] RUTQVIST J，MORIDIS G J，GROVER T，et al. Geomechanical response of permafrost-associated hydrate deposits to depressurization-induced gas production[J]. Journal of Petroleum Science and Engineering，2009，67(1/2)：1–12.
[8] 赵亚鹏，孔 亮，刘乐乐，等. 基于两步折减法的含天然气水合物沉积物海底斜坡稳定性分析[J]. 天然气工业，2021，41(10)：141–153.(ZHAO Yapeng，KONG Liang，LIU Lele，et al. Stability analysis of submarine slope of hydrate-bearing sediments based on the two-step reduction method[J]. Natural Gas Industry，2021，41(10)：141–153.(in Chinese))
[9] MASUI A，HANEDA H，OGATA Y，et al. The effect of saturation degree of methane hydrate on the shear strength of synthetic methane hydrate sediments[C]// The 5th International Conference on Gas Hydrates. Trondheim，Norway：[s. n.]，2005：657–663.
[10] HYODO M，YONEDA J，YOSHIMOTO N，et al. Mechanical and dissociation properties of methane hydrate-bearing sand in deep seabed[J]. Soils and foundations，2013，53(2)：299–314.
[11] HYODO M，LI Y，YONEDA J，et al. Effects of dissociation on the shear strength and deformation behavior of methane hydrate-bearing sediments[J]. Marine and Petroleum Geology，2014，51：52–62.
[12] HYODO M，LI Y，YONEDA J，et al. Mechanical behavior of gas-saturated methane hydrate-bearing sediments[J]. Journal of Geophysical Research：Solid Earth，2013，118(10)：5 185–5 194.
[13] 吴 杨，崔 杰，廖静容，等. 不同细颗粒含量甲烷水合物沉积物三轴剪切试验研究[J]. 岩土工程学报，2021，43(1)：156–164.(WU Yang，CUI Jie，LIAO Jingrong，et al. Experimental study on mechanical characteristics of gas hydrate-bearing sands containing different fines[J]. Chinese Journal of Geotechnical Engineering，2021，43(1)：156–164.(in Chinese))
[14] KIM H S，CHO G C. Experimental study on the compressibility of gas hydrate-bearing sediments[C]// The 2014 World Congress on Advances in Civil，Environmental，and Materials Research. Busan，Korea：[s. n.]，2014.
[15] KIM J，DAI S，JANG J，et al. Compressibility and particle crushing of Krishna-Godavari Basin sediments from offshore India：Implications for gas production from deep-water gas hydrate deposits[J]. Marine and Petroleum Geology，2019，108：697–704.
[16] ZHOU J，YANG Z，WEI C，et al. Mechanical behavior of hydrate-bearing sands with fine particles under isotropic and triaxial compression[J]. Journal of Natural Gas Science and Engineering，2021，92：103991.
[17] MIYAZAKI K，TENMA N，AOKI K，et al. A nonlinear elastic model for triaxial compressive properties of artificial methane-hydrate-bearing sediment samples[J]. Energies，2012，5(10)：4 057–4 075.
[18] UCHIDA S，SOGA K，YAMAMOTO K. Critical state soil constitutive model for methane hydrate soil[J]. Journal of Geophysical Research：Solid Earth，2012，117(B3)：B03209.
[19] FANG H，SHI K，YU Y. Geomechanical constitutive modelling of gas hydrate-bearing sediments by a state-dependent multishear bounding surface model[J]. Journal of Natural Gas Science and Engineering，2020，75：103119.
[20] SANCHEZ M，GAI X，SANTAMARINA J C. A constitutive mechanical model for gas hydrate bearing sediments incorporating inelastic mechanisms[J]. Computers and Geotechnics，2017，84：28–46.
[21] 吴二林，魏厚振，颜荣涛，等. 考虑损伤的含天然气水合物沉积物本构模型[J]. 岩石力学与工程学报，2012，31(增1)：3 045–3 050. (WU Erlin，WEI Houzhen，YAN Rongtao，et al. Constitutive model for gas hydrate-bearing sediments considering damage[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.1)：3 045–3 050.(in Chinese))
[22] 颜荣涛，梁维云，韦昌富，等. 考虑赋存模式影响的含水合物沉积物的本构模型研究[J]. 岩土力学，2017，38(1)：10–18.(YAN Rongtao，LIANG Weiyun，WEI Changfu，et al. A constitutive model for gas hydrate-bearing sediments considering hydrate occurring habits[J]. Rock and Soil Mechanics，2017，38(1)：10–18.(in Chinese))
[23] 袁庆盟，孔 亮，赵亚鹏. 考虑水合物填充和胶结效应的深海能源土弹塑性本构模型[J]. 岩土力学，2020，41(7)：2 304–2 312.(YUAN Qingmeng，KONG Liang，ZHAO Yapeng. An elastoplastic model for energy soils considering filling and bonding effects[J]. Rock and Soil Mechanics，2020，41(7)：2 304–2 312.(in Chinese))
[24] 刘 林，姚仰平，张旭辉，等. 含水合物沉积物的弹塑性本构模型[J]. 力学学报，2020，52(2)：556–566.(LIU Lin，YAO Yangping，ZHANG Xuhui，et al. An elastoplastic constitutive model for gas hydrate-bearing sediments[J]. Chinese Journal of Theoretical and Applied Mechanics，2020，52(2)：556–566.(in Chinese))
[25] YOU K，FLEMINGS P B，MALINVERNO A，et al. Mechanisms of methane hydrate formation in geological systems[J]. Reviews of Geophysics，2019，57(4)：1 146–1 196.
[26] LIU Z，KIM J，LEI L，et al. Tetrahydrofuran hydrate in clayey sediments-laboratory formation，morphology，and wave characterization[J]. Journal of Geophysical Research：Solid Earth，2019，124(4)：3 307–3 319.
[27] 姚仰平. UH模型系列研究[J]. 岩土工程学报，2015，37(2)：193–217.(YAO Yangping. Advanced UH models for soils[J]. Chinese Journal of Geotechnical Engineering，2015，37(2)：193–217.(in Chinese))
[28] 姚仰平，刘 林，罗 汀. 砂土的UH模型[J]. 岩土工程学报，2016，38(12)：2 147–2 153.(YAO Yangping，LIU Lin，LUO Ting. UH model for sands[J]. Chinese Journal of Geotechnical Engineering，2016，38(12)：2 147–2 153.(in Chinese))
[29] YAO Y P，LIU L，LUO T，et al. Unified hardening (UH) model for clays and sands[J]. Computers and Geotechnics，2019，110：326–343.
[30] LIU C，YE Y，MENG Q，et al. The characteristics of gas hydrates recovered from Shenhu area in the South China Sea[J]. Marine Geology，2012，307：22–27.
[31] JIANG M J，SUN Y G，YANG Q J. A simple distinct element modeling of the mechanical behavior of methane hydrate-bearing sediments in deep seabed[J]. Granular Matter，2013，15(2)：209–220.
[32] HYODO M，WU Y，NAKASHIMA K，et al. Influence of fines content on the mechanical behavior of methane hydrate-bearing sediments[J]. Journal of Geophysical Research：Solid Earth，2017，122(10)：7 511–7 524.
[33] ZHAO Y，KONG L，XU R，et al. Mechanical properties of remolded hydrate-bearing clayey-silty sediments[J]. Journal of Natural Gas Science and Engineering，2022，100：104473.
[34] WU P，LI Y，SUN X，et al. Mechanical characteristics of hydrate-bearing sediment：A review[J]. Energy and Fuels，2021，35(2)：1 041–1 057.
[35] 罗 汀，姚仰平，侯 伟. 土的本构关系[M]. 北京：人民交通出版社，2010：2–5.(LUO Ting，YAO Yangping，HOU Wei. Soil constitutive models[M]. Beijing：China Communications Press，2010：2–5.(in Chinese))
[36] YAO Y，WANG N，CHEN D. UH model for granular soils considering low confining pressure[J]. Acta Geotechnica，2020，16(6)：1 815–1 827.
[37] ZHANG X，LIN J，LU X，et al. A hypoplastic model for gas hydrate-bearing sandy sediments[J]. International Journal for Numerical and Analytical Methods in Geomechanics，2018，42(7)：931–942.
[38] 刘乐乐，张旭辉，刘昌岭，等. 含水合物沉积物三轴剪切试验与损伤统计分析[J]. 力学学报，2016，48(3)：720–729.(LIU Lele，ZHANG Xuhui，LIU Changling，et al. Triaxial shear tests and statistical analyses of damage for methane hydrate-bearing sediments[J]. Chinese Journal of Theoretical and Applied Mechanics，2016，48(3)：720–729.(in Chinese))
[39] YAN R，WEI C. Constitutive model for gas hydrate-bearing soils considering hydrate occurrence habits[J]. International Journal of Geomechanics，2017，17(8)：04017032.
[40] KONG L，WANG X，HUA L，et al. A bounding surface model of gas hydrate-bearing sediments[J]. Environmental Geotechnics，2019：1–7. |
|
|
|
2022, Vol. 41 
