| 基于变湿应力概念的膨胀土初始开裂分析 |
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| 引用本文： | 吴珺华,袁俊平,卢廷浩.基于变湿应力概念的膨胀土初始开裂分析[J].岩土力学,2011,32(6):1631-1636. |
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| 作者姓名： | 吴珺华 袁俊平 卢廷浩 |
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| 作者单位： | 1. 河海大学 岩土力学与堤坝工程教育部重点实验室，南京210098；2. 河海大学 岩土工程科学研究所，南京210098 |
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| 基金项目： | "十一五"国家科技支撑计划课题资助，国家自然科学基金青年基金项目资助 |
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| 摘 要： | 含水率变化时膨胀土体积会产生吸水膨胀或失水收缩，这与温度变化时一般材料的反应相似。当土体的胀缩变形受到约束时就会产生应力，据此提出了变湿应力的概念。借用温度应力理论分析思路，基于弹性力学理论，采用变湿应力来计算土体的胀缩变形，建立了用含水率变化计算变湿应力的理论模型。揭示了裂隙产生的机理是不同埋深处土体水分丧失速率的不同，产生了不均匀的收缩变形。提出了膨胀土初始开裂的临界变湿判据，经比较与实测结果较一致。利用该模型，推导了地表蒸发条件下膨胀土的裂隙初始开展深度，并对其与土体变形模量、胀缩特征参数等的关系进行了讨论。
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| 关 键 词： | 膨胀土 胀缩变形 变湿应力 裂隙 |
| 收稿时间： | 2010-03-03 |
Analysis of initial cracking behavior of expansive soil due to moisture change stress |
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| WU Jun-hua,YUAN Jun-ping,LU Ting-hao.Analysis of initial cracking behavior of expansive soil due to moisture change stress[J].Rock and Soil Mechanics,2011,32(6):1631-1636. |
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| Authors: | WU Jun-hua YUAN Jun-ping LU Ting-hao |
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| Institution: | 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China; 2. Geotechnical Research Institute, Hohai University, Nanjing 210098, China |
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| Abstract: | Water swelling and drying shrinkage due to moisture change is the expansive soil's characteristic which is similar to the thermal effect of material.Stress is generated by the swell-shrinking deformation constraints and the concept of moisture change stress is put forward.The moisture change stress is adopted to calculate swell-shrinking deformation based on the thermal stress and elasticity theory.A theoretical model which could calculate the moisture change stress resulted from moisture change is establis... |
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| Keywords: | expansive soil swell-shrinking deformation moisture change stress crack |
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