南京下蜀土水敏性特征的试验研究

Experimental study on water sensitivity characteristics of Nanjing Xiashu Loess

对不同含水状态下南京下蜀土的物理性质、水理性质以及力学性质开展试验研究,探讨了下蜀土的主要水敏性特征。研究表明:在干、湿不同状态下,南京下蜀土物理性质、水理性质及抗剪强度差异明显,含水率较高的下蜀土表现出一定的塑性,脱湿条件下逐渐表现出脆性破坏特征。临界含水率及拐点含水率是研究南京下蜀土水敏性特征的重要参数。研究成果进一步丰富了对下蜀土水敏性的认识,对于评价不同含水状态下下蜀土的工程地质性质,尤其对下蜀土边坡稳定性的分析评价具有重要意义。

The physical, hydraulic and mechanical properties of Nanjing Xiashu loess during water content change were analyzed based on a series of lab tests.The test results showed that the physical, hydraulic and mechanical properties of Xiashu loess varied significantly in different moist state,the plasticity of the unsaturated Xiashu Loess rises with water content, and the prevailence of brittle failure characteristic generated in the desorption process.The critical moisture content and the inflection point moisture content were proposed as boundary parameters of water sensitivity characteristic. This study was be useful in further research on the water sensitivity characteristic of Xiashu Loess. It is important to evaluate the engineering geological characteristics and slope stability analysis of Xiashu Loess in different water contents.