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兰州市区第三系风化砂岩胶结弱,成岩性差,是一种极软质岩石。目前对于砂岩地基承载力的评价尤其是深度与宽度修正模式研究尚少,本文通过现场静载荷试验对比研究,得出了风化砂岩地基受荷后的变形特征与破坏模式,从理论上分析了其承载力特征值可以进行深度修正;并进一步通过模拟边载条件下的载荷试验进行验证,其结果表明,在边载作用下,砂岩地基承载力特征值会大幅度提高,按密实砂土修正系数进行承载力修正结果偏于安全。本文通过现场试验研究结合理论分析,为评价风化砂岩地基承载力提供了一个可靠实例与解决类似问题的研究思路。
Tertiary weathering sandstone in Lanzhou City has weak cementation and poor diagenesis. It is a very soft rock. At present, the research on the evaluation of bearing capacity of sandstone foundation, especially the depth and width correction mode, is still little. In this paper, the deformation characteristics and failure modes of weathered sandstone foundation after loading are obtained through comparative study of on-site static load test. The results show that the characteristic value of bearing capacity of sandstone foundation will be greatly increased under the action of side load and the correction value of the correction coefficient Carrying capacity correction results partial safety. Through field test and theoretical analysis, this paper provides a reliable example and a research idea to solve the similar problems in evaluating the bearing capacity of weathered sandstone foundation.