花岗岩风化地层中“孤石含量百分比”的确定方法

Determination of Boulder Content Percentage in Weathered Granite Strata

本文分析了花岗岩风化地层中的"孤石"形成的内在机理;探讨了花岗岩"孤石"的水平与垂直方向的分布规律;提出了对含有"孤石"的花岗岩地层要采取工程地质调绘与物探、钻探相结合的综合方法进行地质勘察,着重提出了可根据"土石比专项勘察"或"利用场地已有勘察资料和施工单位在现场所开挖的断面"或"孤石方量的实际计量"来测定"孤石含量百分比"的3种方法,为解决土石方工程在开挖及计价方面的问题提供了一些建设性的意见和思路,对相应类似工程具有指导意义。

This paper analyzes the formation mechanism of boulder in weathered strata, and explores the boulder horizontal and vertical distribution regularity. We propose that in the boulder-bearing granite strata, comprehensive methods of engineering geological, geophysical and drilling surveys are effective. And 3 methods of determining boulder content percentage are presented, i. e. , special survey of soil-rock ratio, using previous investigation data and excavated cross sections in site and calculation of real amount of boulder. This study may provide new insights for addressing issues of excavation and evaluation in the earth and rock engineering, and has guidance significance for the similar projects.