论文部分内容阅读
压实填土一般为典型的非饱和土,广泛存在于各类工程中,其物理力学性质受填土含水状态的影响。因基质吸力测量困难,非饱和土强度理论难以在压实填土工程中应用。研究含水状态变化对压实土抗剪强度影响的大小,寻找一种简化实用的非饱和压实土抗剪强度确定方法。从非饱和土理论出发,对含水状态影响压实土抗剪强度的机制进行了分析,重新整理并分析了5种压实土的非饱和三轴试验结果,对一些压实土工程资料中的直剪试验强度指标进行了收集和整理。分析表明,基质吸力对压实填土抗剪强度的贡献占有相当大的比例;含水率变化对压实填土抗剪强度的影响是非常显著和不容忽视的。工程资料中压实土饱和度对数值与黏聚力指标有良好的线性相关关系,提出了一个考虑饱和度影响的压实填土抗剪强度简易计算方法。
Compacted fill is generally typical unsaturated soil, widely exists in various types of engineering, its physical and mechanical properties affected by the state of filling water. Due to the difficulty of measuring matrix suction, the theory of unsaturated soil strength is difficult to apply in compaction and filling engineering. The influence of water content on the shear strength of compacted soil was studied, and a simple and practical method to determine the shear strength of unsaturated compacted soil was proposed. Based on the theory of unsaturated soil, the mechanism that the influence of water content on the shear strength of compacted soil is analyzed, and the results of unsaturated triaxial test of five kinds of compacted soil are rearranged and analyzed. For some compacted soil engineering data Direct shear test strength indicators were collected and collated. The analysis shows that the contribution of substrate suction to the compaction fill plays a significant role in the shear strength. The influence of water content on the shear strength of compacted fill is very significant and can not be neglected. There is a good linear relationship between logarithm of compaction soil saturation and cohesion index in engineering data. A simple calculation method of shear strength of compacted fill is proposed considering the effect of saturation.