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兰州风化砂岩是一种极软质岩,多为泥质胶结,具有成岩性差、易风化、遇水崩解等特点,是兰州地区广泛分布的基岩。采用现行规范对其工程特性进行的评价与工程测试成果有较大的差异,按现行规范与试验方法对兰州风化砂岩地基的工程参数进行定量评价也是不适宜的,兰州地区风化砂岩的工程特性评价未有准确的定量分析方法和标准。本文通过不同方法载荷试验、旁压试验对比分析以及兰州超高层建筑工程实践,探讨了兰州风化砂岩的工程特性及影响因素,提出了兰州地区风化砂岩地基工程参数的分析评价方法。
Lanzhou weathered sandstone is a very soft rock, mostly muddy cemented, with poor diagenesis, weathering, water disintegration and other characteristics of Lanzhou is widely distributed bedrock. There is a big difference between the evaluation of engineering characteristics and the engineering test results using the current codes. It is also not appropriate to quantitatively evaluate the engineering parameters of Lanzhou weathered sandstone foundation according to the current norms and test methods. The engineering characteristics of weathered sandstone in Lanzhou There is no accurate quantitative analysis methods and standards. This paper discusses the engineering characteristics and influencing factors of Lanzhou weathered sandstone through different methods of load test, comparative analysis of pressure test and the practice of Lanzhou super high-rise building, and puts forward the analytical method of engineering parameters of weathered sandstone foundation in Lanzhou.