| 高低压下不同力学特性的砂土统一模型 |
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| 引用本文： | 陆勇,周国庆,顾欢达.高低压下不同力学特性的砂土统一模型[J].岩土力学,2018,39(2):614-620. |
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| 作者姓名： | 陆勇 周国庆 顾欢达 |
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| 作者单位： | 1. 苏州科技大学 土木工程学院，江苏 苏州 215011； 2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室，江苏 徐州 221116 |
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| 基金项目： | 江苏省高校自然科学研究项目（No. 15KJB170017）；住房和城乡建设部科技计划项目（No. 2015-K4-034）；国家自然科学基金项目（No. 51378327）。 |
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| 摘 要： | 为构建能够反映砂土高低压下不同力学特性的统一模型，分析了砂土在较大的压力范围内的力学试验结果并获取其强度、等向压缩以及临界状态特性参数。通过引入应力路径相关因子来修正塑性应变增量中与应力路径相关的部分，从而使得模型硬化参量能够反映密实砂土在常压下的剪胀特性。同时，基于砂土的临界状态特性提出能够与砂土内部状态相对应的潜在状态面概念，由屈服面与潜在状态面间的动态关系确定加载过程中的动态密实参数及潜在强度，进而使得硬化参量也能够反映密实砂土在常压下的软化特性及高压下的剪缩、硬化特性。分析模型屈服面及潜在状态面间的演化规律并对不同压力等级下的砂土受荷力学行为进行模拟预测，证实了该模型能够反映密实砂土常压下剪胀软化及高压下剪缩硬化的特性。
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| 关 键 词： | 砂土 高压 力学特性 硬化参数 本构模型 |
| 收稿时间： | 2016-07-27 |
Unified model of sand with different mechanical characteristics under high and low pressures |
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| LU Yong,ZHOU Guo-qing,GU Huan-da.Unified model of sand with different mechanical characteristics under high and low pressures[J].Rock and Soil Mechanics,2018,39(2):614-620. |
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| Authors: | LU Yong ZHOU Guo-qing GU Huan-da |
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| Institution: | 1. School of Civil Engineering, Suzhou University of Science and Technology, Suzhou, Jiangsu 215011, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | To reflect the different mechanical characteristics of sand under high and low pressures, the mechanical test results of sand, i.e., the strength, isotropic compression and critical state characteristic parameters, under a large range of confining pressure are analyzed to build a unified model. Correlation factor of stress path is used to adjust the plastic deformation related to stress path, and the hardening parameter can be used to describe the dilatancy behavior of relatively dense sand under low pressure. Based on the critical state behavior of sand, potential state surface is proposed to reflect the sand inherent state. With the dynamic relationship between the yield surface and potential state surface, the current compactness parameter and potential strength of sand are defined. The hardening parameter can reflect shear softening and shear contraction hardening properties of relatively dense sand under low and high pressures. Evolution law of yield surface and potential state surface is analyzed, and model prediction under different pressures is carried out. Results comparison validates the proposed model with the capability to reflect shear dilatancy softening and shear contraction hardening properties of sand under different pressures. |
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| Keywords: | sand high pressure mechanical properties hardening parameter constitutive model |
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