黏质及砂质能源土统一的弹塑性本构模型

doi:10.13722/j.cnki.jrme.2022.0149

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摘要目前能源土的三轴剪切试验及其本构模型多以砂质等粗颗粒储层为主，泥质粉砂型能源土试验与本构模拟偏少，能统一描述黏质与砂质能源土的本构模型更是少见。本文首先开展泥质粉砂能源土的三轴剪切试验，结合前人成果，深入总结能源土的力学特性。随后在黏土与砂土统一的硬化模型(CSUH)框架下，考虑能源土特殊力学特性，通过构建与水合物饱和度相关的压硬性参量描述能源土的压缩特性，引入胶结因子及剪胀因子分别反映黏聚强度和剪胀效应，并通过状态参数反映能源土的剪切状态，结合非关联流动法则建立一个能够统一描述黏质及砂质能源土的弹塑性本构模型。编制模型验证程序，通过本文及其他学者的多组三轴剪切试验来验证本构模型的有效性。结果表明：所建立的弹塑性本构模型能够对黏质细颗粒及砂质粗颗粒能源土的剪切特性进行统一描述，可以有效反映能源土的应变硬化及软化、体积剪缩及剪胀等力学特性，并对水合物饱和度、有效围压的影响有着较好的预测效果。

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	赵亚鹏1
	2
	3
	刘乐乐3
	4
	孔亮1
	2
	桑松魁1
	2
	王兴1
	2
	刘佳棋1

关键词 ：土力学, 天然气水合物, 黏质及砂质, 力学特性, CSUH模型, 胶结, 剪胀

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.

Key words： soil mechanics natural gas hydrate clayey and sandy mechanical properties CSUH model cementation shear dilatation

引用本文:

赵亚鹏1，2，3，刘乐乐3，4，孔亮1，2，桑松魁1，2，王兴1，2，刘佳棋1. 黏质及砂质能源土统一的弹塑性本构模型[J]. 岩石力学与工程学报, 2022, 41(12): 2579-2591.
ZHAO Yapeng1，2，3，LIU Lele3，4，KONG Liang1，2，SANG Songkui1，2，WANG Xing1，2，LIU Jiaqi1. Unified elastoplastic constitutive model for clayey and sandy energy soils. , 2022, 41(12): 2579-2591.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0149 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2579

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