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残积土在我国南方分布十分广泛,是工程建设及地质灾害评估中主要遇到的土体之一。非饱和状态下,残积土边坡土体的工程性质不仅取决于土的组成、结构和应力状态,还与土中的吸力密切相关;土-水特征曲线表达了土体中含水量与吸力的关系,是非饱和土研究的重要内容之一。选取福建省有典型代表的凝灰质砂砾岩残积土、凝灰岩残积土以及花岗斑岩残积土3种类型土作为试验土样,测定土样完整的脱湿、吸湿循环过程的土-水特征曲线。鉴于基质吸力测量困难,在Barden非饱和土分类方法的基础上,通过分析具有实际工程意义的含水量情况(饱和度介于50%~90%),总结出的利用饱和度预测基质吸力的简易方法具有针对性和实用性。
Residual soil is widely distributed in southern China, is one of the main soil encountered in engineering construction and geological disaster assessment. Under unsaturated condition, the engineering properties of the residual soil slope soil not only depend on the composition, structure and stress state of the soil, but also closely related to the soil suction; soil-water characteristic curve expresses the soil water content and suction Relationship, is one of the important content of unsaturated soil research. Three typical types of soil, tuffaceous conglomerate residual soil, tuff residual soil and granite porphyry residual soil, were selected as the test soil samples from typical representative Fujian Province, and the soil-water characteristic curves of complete desiccation and hygroscopic circulation processes were determined . In view of the difficulty of matrix suction measurement, based on the classification method of Barden unsaturated soil, the actual engineering significance of water content (saturation ranged from 50% to 90%) was analyzed, and the summary of the use of saturation to predict the matric suction The method is pertinent and practical.