盾构影响下的路基土气态水迁移研究

Study of Gaseous Water Migration in Roadbed Soil under the Influence of Shield

为了探讨盾构影响下路基土的抗冻胀性及其气态水迁移规律,本文通过创新发明的试验装置,开展了不同含水率和不同压实度的路基土在不同温度下的气态水迁移试验。试验结果揭示出:同一压实度的路基土在相同温度情况下气态水迁移质量随含水率的增大而增大;当含水率较低时,路基土的气态水迁移质量随着压实度的增大呈先减小后增加的趋势,当含水率较高时,路基土的气态水迁移质量随着压实度的增大而增加;同一含水率的路基土在相同压实度情况下气态水迁移质量随着温度的升高而增大。本研究成果对于探索路基土在盾构影响下的气态水迁移规律具有一定的现实意义,同时为非饱和土的水汽迁移机理深入研究提供借鉴。

In order to investigate the frost swelling resistance of the roadbed soil and its gaseous water migration law under the influence of shield structure, this paper carried out the gaseous water migration test of roadbed soil with different water content and different compaction degree at different temperatures by means of an innovative invented test device. The test results reveal that: the gaseous water migration mass of the same compaction degree of roadbed soil at the same temperature increases with the increase of water content. When the water content is low, the gaseous water migration mass of roadbed soil decreases with the increase of compaction degree and then increases with the increase of compaction degree. When the water content is high, the gaseous water migration mass of roadbed soil increases with the increase of compaction degree. The gaseous water migration mass increases with the increase of temperature for the same moisture content of the roadbed soil at the same compaction level. The research results are of practical significance for exploring the gaseous water migration law of roadbed soil under the influence of shield structure, and also provide reference for the in-depth study of water vapor migration mechanism of unsaturated soil.