陡坡寺中微风化料的大型三轴试验研究

随着西部山区的基础设施建设进入迅速发展的阶段，越来越多的高填方工程正在或将要兴建，而对填料力学性质的认识也就成为决定这些高填方工程安全性的重要因素。通过一系列大型三轴试验，对分布于云南等地的陡坡寺中微风化料的剪切力学特性进行了研究。结果表明，陡坡寺中微风化料与典型堆石料的力学特性有很大不同，其强度较低，并且应力-应变关系、强度和刚度等特征都比较接近于细粒土。另外，水对陡坡寺中微风化料的力学特性有着显著的影响，其遇水后强度大为降低，因此,在设计和施工中必须予以充分考虑。对试验数据的拟合表明，邓肯-张模型能较好地模拟陡坡寺中微风化料在不同围压下的应力-应变关系。

Large scale triaxial testing of Douposi moderately-to-slightly weathered fill materials

The rapid development of infrastructure in the western area of China leads to the construction of more and more high fills. Accurate information on the shear behavior of the fill materials becomes a key issue for a safe design and construction. A series of large scale triaxial tests have been conducted on Douposi moderately-to-slightly weathered fill materials, which is a weak rockfill mainly found in Yunnan province. The test results show that the shear behavior of Douposi moderately-to-slightly weathered fill materials is very different from other typical rockfills, with a low shearing strength, while the stress-strain relationship, stiffness and strength characteristics are more similar to those of fine grain soils. Furthermore, water can reduce the strength of Douposi moderately-to-slightly weathered fill materials significantly, which must be taken into account during design and construction. Finally, it is demonstrated that the Duncan-Chang model is capable of simulating the shear behavior of Douposi moderately-to-slightly weathered fill materials.