| 考虑物理性质参数变化的膨润土缓冲材料水-热耦合SPH数值解 |
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| 引用本文： | 许韬,白冰.考虑物理性质参数变化的膨润土缓冲材料水-热耦合SPH数值解[J].岩土力学,2018,39(10):3853-3862. |
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| 作者姓名： | 许韬 白冰 |
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| 作者单位： | 北京交通大学 土木建筑工程学院，北京 100044 |
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| 基金项目： | 国家自然科学基金(No. 51478034，No. 51678043)；北京市自然科学基金(No. 8182046) |
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| 摘 要： | 为了研究热源温度和外界水压对缓冲层中水-热迁移规律的影响，以GMZ膨润土为例，从基于势能的非饱和土的水-热迁移控制方程出发，考虑了蒸发效应的影响，得到了水-热耦合的方程组，采用改进的光滑粒子流体动力学(SPH)算法，能够对每一处土体根据不同时刻的不同状态实时更新计算参数，得到参数变化的水-热耦合解。计算结果表明：土的物理性质参数与土体的温度和饱和度密切相关，是否考虑这些参数的变化会对计算结果产生较大影响；核废料释放的热量能够在较短的时间内扩散到外边界，水分迁移的速度则相对慢很多；缓冲层温度的升高会加快水分的迁移速度，外界水压对温度的分布则影响较小。
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| 关 键 词： | 缓冲材料 非饱和土 水-热耦合 光滑粒子流体动力学（SPH）算法 |
| 收稿时间： | 2017-03-13 |
SPH numerical solutions of thermo-hydro coupling for bentonite
with varying physical parameters |
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| XU Tao,BAI Bing.SPH numerical solutions of thermo-hydro coupling for bentonite
with varying physical parameters[J].Rock and Soil Mechanics,2018,39(10):3853-3862. |
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| Authors: | XU Tao BAI Bing |
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| Institution: | School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | To study the effect of temperature and water pressure on heat and mass transfer in buffer material, taking the compacted Gaomiaozi bentonite as an example, coupled thermo-hydro equations are derived from potential-based control equations of unsaturated soil, with the consideration of evaporation. We modify the smoothed particle hydrodynamics (SPH) algorithm to get coupled solutions with varying parameters during the calculation. Parameters of each single representation elementary volume will be updated in real time according to the current state. Results indicate that: Because calculation parameters are closely related to soil’s state, variation of parameters influence significantly on the results. The heat from nuclear waste can spread through the buffer in a short time, water migration rate is relatively slower. Increasing of buffer’s temperature will accelerate the migration of water. In comparison, water pressure has smaller effect on temperature distribution. |
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| Keywords: | buffer material unsaturated soil thermo-hydro coupling smoothed particle hydrodynamics (SPH) algorithm |
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