| 土石混合体砾-土接触面参数的敏感性分析 |
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| 引用本文： | 季婷媛, 张丹, 李长圣, 施斌, 陈晓雪. 2016: 土石混合体砾-土接触面参数的敏感性分析. 工程地质学报, 24(s1): 1203-1210. DOI: 10.13544/j.cnki.jeg.2016.s1.175 |
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| 作者姓名： | 季婷媛 张丹 李长圣 施斌 陈晓雪 |
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| 作者单位： | 1.南京大学地球科学与工程学院 南京 210023 |
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| 基金项目： | 国家自然科学基金项目（41272315，41572271）资助 |
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| 摘 要： | 土石混合体作为一种特殊的地质体在自然界中广泛分布，由强度较高的岩石块体、细土颗粒和充填其间的孔隙组成。随着各类大型工程建设的兴起和发展，与土石混合体相关的地质灾害严重影响和制约了工程的建设和人类的安全，因而对土石混合体的研究至关重要。本文从细观角度出发着重研究土石混合体中砾石和土体之间的接触性质，利用FLAC3D接触面单元模拟了土石混合体中的砾-土界面，首先构建了包含接触面的土石混合体三维数值模型，其次选取了接触面参数的合理变化范围，通过对数值模拟结果的分析，探讨了参数的敏感性，发现刚度，特别是法向刚度对土石混合体应力-应变曲线和砾-土的相对运动影响最大，其次是黏聚力，摩擦角的影响最小。通过与无接触面模型的对比，验证了包含接触面单元土石混合体三维模型的可行性和合理性。接触面单元的引入使精确描述土石混合体的宏观变形特征及砾-土间的相互作用机制成为可能。
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| 关 键 词： | 土石混合体 FLAC3D 接触面单元 砾-土界面 参数敏感性 |
| 收稿时间： | 2016-02-25 |
| 修稿时间： | 2016-05-20 |
SENSITIVITY ANALYSIS ON GRAVEL-SOIL INTERFACE PARAMETERS OF THE SOIL-ROCK MIXTURE |
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| JI Tingyuan, ZHANG Dan, LI Changsheng, SHI Bin, CHEN Xiaoxue. 2016: SENSITIVITY ANALYSIS ON GRAVEL-SOIL INTERFACE PARAMETERS OF THE SOIL-ROCK MIXTURE. JOURNAL OF ENGINEERING GEOLOGY, 24(s1): 1203-1210. DOI: 10.13544/j.cnki.jeg.2016.s1.175 |
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| Authors: | JI Tingyuan ZHANG Dan LI Changsheng SHI Bin CHEN Xiaoxue |
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| Affiliation: | 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023 |
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| Abstract: | Soil-rock mixture is a kind of special geological material and has a wide spread in nature. It is comprised of rock blocks, fine soil particleand pore which is filled in. With the increase and development of all kinds of large scale engineering construction, geological disasters related to soil-rock mixture has seriously affected and restricted the engineering construction and human safety. Thus, it is important to study the soil-rock mixture. In this paper, the contact characteristic of rock and soil in soil-rock mixture has been focused on from the perspective of meso-structure. In order to simulate the gravel-soil interface in soil-rock mixture, the interface element in FLAC3D was used and then a three-dimensional numerical model of soil-rock mixture containing interface element was built. The reasonable variation range of interface parameters was selected. By analyzing the numerical simulation results, the sensitivity of parameters was investigated. It was found that stiffness, especially the normal stiffness has the significant effect on stress-strain curve of the soil-rock mixture as well as the relative movement between gravel and soil. Cohesion follows and the influence of friction angle is minimal. By comparing with the model without interface element, the feasibility and rationality of three-dimensional model of soil-rock mixture containing interface element are verified. The application of interface element makes it possible to accurately describe the macroscopic deformation characteristics of soil-rock mixture and the interaction mechanism between the gravel and soil. |
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| Keywords: | Soil-rock mixture FLAC3D Interface element Gravel-soil interface Parameter sensitivity |
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