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CALCULATION METHOD FOR SWELLING DEFORMATION OF EXPANSIVE SOIL FOUNDATION
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摘要: 含水率增加会引起膨胀土地基膨胀变形。室内试验和现场测试结果表明,膨胀率和膨胀力随含水率的增加呈线性增大,大气影响深度范围内膨胀土地基含水率变化随深度呈线性减小,膨胀率与上覆压力可用椭圆形曲线表示。在推导膨胀率计算公式的基础上,建议采用分层总和法计算膨胀土地基膨胀变形。计算表明,计算结果与模型试验结果较吻合,而规范方法计算结果偏大。Abstract: The increase of water content will cause swelling deformation of expansive soil foundation.The swelling rate and pressure are raised linearly with water content.The change of water content of expansive soil foundation decreases linearly with depth within the atmosphere effect depth.The expansive rate is elliptic with overburden pressure.A formula of expansive rate is obtained.A calculation method for swelling deformation of expansive soil foundation is proposed with layer-wise summation method.The results of proposed method are identical with that of the model test,and the results of the code are on the large side.
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Key words:
- expansive soil /
- swelling deformation /
- calculation method /
- water content /
- expansive rate
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