兰州地区风化砂岩地基工程特性及工程参数

Engineering characteristics and engineering parameters of weathered sandstone foundation in Lanzhou area

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。

The Lanzhou weathered sandstone is a kind of very soft rock which is mostly shale cementation and widely distributed in Lanzhou area as bedrock,and its characteristics are poor diagenetic grade,easy weathering and collapse under the influence of water. There are great differences in engineering characteristic evaluation using existing norms and engineering test results,and the quantitative engineering parameters evaluation of Lanzhou weathered sandstone by testing and existing norms is inappropriate.There are no accurate quantitative methods and norms in the engineering characteristic evaluation of Lanzhou weathered sandstone. By different load tests,lateral loading tests and super high-rise buildings engineering practice in Lanzhou,the engineering properties and influencing factors of Lanzhou weathered sandstone are discussed and an analysis and evaluation method for Lanzhou weathered sandstone 's foundation parameters is proposed.