基于静力触探曲线的土体量化分层方法

A quantified soil stratifying method based on cone penetration test curve

利用静力触探曲线进行土层划分是工程勘察的重要手段,然而,目前缺乏一种运用静力触探曲线规范地、定量地划分土层的方法,导致了实际操作中的随意性,影响了工程勘察的准确性,也不利于工程勘察及静力触探技术的发展。对此,本文提出了一种根据弹塑性力学中圆形均布载荷下的Mindlin解,定量确定超前深度并以此进行土层划分的方法,将该方法应用到武汉青山区某乙烯提取装置的工程项目中,并将划分出的土层与实际揭露土层进行了对比分析。结果表明,该方法能够比较准确地划分出力学性质差异较大的土层。

It is an important and useful method to stratify soil layers according to the curve of cone penetration test.However,nowadays there is a lack of normative quantified stratifying methods,which will lead to the arbitrariness in actual operation.This arbitrariness will reduce the accuracy in engineering investigation and is also to the disadvantage of development of engineering investigation and cone penetration test.Therefore,a quantified stratifying method is put forward based on Mindlin formula in plastoelasticity under circular uniform load.To verify this method,it is used in an ethylene extraction device project in Qingshan district of Wuhan city.The result shows that this quantified stratifying method can relatively stratify those soil layers,which exhibit obvious lead-lag reflection and difference in mechanical properties.