深圳大学学报理工版

构建一种数值与试验相结合的计算湿度应力场的方法,根据湿度应力场与温度应力场的相似性,采用FLAC软件温度应力场模拟原位竖向膨胀力试验,由此确定湿度场线膨胀系数. 利用室内模型试验对该模拟结果的准确性进行验证,室内模型试验和数值模拟得到的竖向膨胀力大小接近,规律基本一致,表明此种近似的膨胀土湿度应力场计算方法有效可行.研究可为膨胀土膨胀特性的数值模拟提供借鉴.

An approximate approach to calculate moisture stress field of expansive soil is put forth based on numerical calculation and experiments. According to the similarity between the temperature stress field and humidity stress field, in-situ test of vertical expansion force is simulated by a FLAC simulated temperature stress field, aiming at determining expansive factors of a moisture stress field. Indoor model tests are used to verify the correctness of numerical analysis results. The vertical expensive forces determined by numerical simulation are close to the indoor model test results. The results show that the proposed calculation method of expansive soil moisture stress field is feasible and effective. Research results could serve for numerical analysis on the swelling characteristic of expansive soil.

引言
1 温度场模拟湿度场理论基础
2 原位竖向膨胀力试验
3 湿度场线膨胀系数计算
4 湿度场线膨胀系数验算
5 结论

图1 现场竖向膨胀力试验试验点<br/>Fig.1 (Color online)The field for vertical expansion force test

图1 现场竖向膨胀力试验试验点
Fig.1 (Color online)The field for vertical expansion force test

图2 现场竖向膨胀力试验<br/>Fig.2 (Color online)The field test of vertical expansion force

图2 现场竖向膨胀力试验
Fig.2 (Color online)The field test of vertical expansion force

图3 中-强膨胀土试验曲线<br/>Fig.3 The test curve in middle-strong expansive soil

图3 中-强膨胀土试验曲线
Fig.3 The test curve in middle-strong expansive soil

图4 中-弱膨胀土试验曲线<br/>Fig.4 The test curve in weak-middle expansive soil

图4 中-弱膨胀土试验曲线
Fig.4 The test curve in weak-middle expansive soil

表1 试验工点膨胀土基本物理力学参数<br/>Table 1 Basic physical and mechanical parameters of expansive soil in the test point

表1 试验工点膨胀土基本物理力学参数
Table 1 Basic physical and mechanical parameters of expansive soil in the test point

图5 竖向膨胀力试验有限差分模型<br/>Fig.5 The finite difference model of vertical expansive force test

图5 竖向膨胀力试验有限差分模型
Fig.5 The finite difference model of vertical expansive force test

图6 中-强膨胀土温度场分布图<br/>Fig.6 (Color online)Temperature field in middle-strong expansive soil

图6 中-强膨胀土温度场分布图
Fig.6 (Color online)Temperature field in middle-strong expansive soil

图7 中-强膨胀土单元体竖向应力<br/>Fig.7 (Color online)Vertical stress in middle-strong expansive soil

图7 中-强膨胀土单元体竖向应力
Fig.7 (Color online)Vertical stress in middle-strong expansive soil

图8 浸水后膨胀土密度沿深度的变化<br/>Fig.8 Variation of expansive density with depth after immersing

图8 浸水后膨胀土密度沿深度的变化
Fig.8 Variation of expansive density with depth after immersing

图9 浸水后膨胀土弹性模量沿深度的变化<br/>Fig.9 Variation of expansive elasticity modulus with depth after immersing

图9 浸水后膨胀土弹性模量沿深度的变化
Fig.9 Variation of expansive elasticity modulus with depth after immersing

图10 温度沿深度变化<br/>Fig.10 Variation of temperature with depth

图10 温度沿深度变化
Fig.10 Variation of temperature with depth

图11 线膨胀系数沿深度的变化<br/>Fig.11 Variation of coefficient of linear expansion with depth

图11 线膨胀系数沿深度的变化
Fig.11 Variation of coefficient of linear expansion with depth

图12 有减胀层的膨胀力模型试验<br/>Fig.12 The model test of expansive deformation with a swelling relief layer

图12 有减胀层的膨胀力模型试验
Fig.12 The model test of expansive deformation with a swelling relief layer

图13 无减胀层的膨胀力模型试验<br/>Fig.13 The model test of expansive deformation without a swelling relief layer

图13 无减胀层的膨胀力模型试验
Fig.13 The model test of expansive deformation without a swelling relief layer

表2 室内减胀层试验填料参数<br/>Table 2 Parameters of test packing in swelling relief layer

表2 室内减胀层试验填料参数
Table 2 Parameters of test packing in swelling relief layer

图14 无减胀层结果对比<br/>Fig.14 The calculated value of vertical expansion force

图14 无减胀层结果对比
Fig.14 The calculated value of vertical expansion force

图15 有减胀层结果对比<br/>Fig.15 The test value of vertical expansion force

图15 有减胀层结果对比
Fig.15 The test value of vertical expansion force

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引言

1 温度场模拟湿度场理论基础

2 原位竖向膨胀力试验

3 湿度场线膨胀系数计算

4 湿度场线膨胀系数验算

5 结论

期刊信息

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