静力触探在广西花岗岩地区沟谷相软土的试验研究与应用

Experimental Research and Application of Static Sounding in Ditch-Valley Phase Soft Soil of Guangxi Granite Region

文章以广西贵港至合浦高速公路项目为依托,开展了花岗岩沟谷相软土的静力触探试验工作,重点研究了静力触探在划分土层类别、估算地基承载力、不排水抗剪强度、土层变形指标、天然重度和判定塑性状态等方面的应用,总结和筛选了适用于该高速公路软基的触探经验公式,并基于现场试验数据,得出花岗岩地区典型沟谷相软土地层和水泥搅拌桩复合地基的承载力特征值,与现场荷载试验结果较为一致,同时通过对试验数据的线性回归分析,归纳了该地区的静力触探经验公式,可为类似工程提供参考。

Based on Guangxi Guigang-Hepu Expressway project,this article carried out the static cone penetration test work for granite ditch-valley phase soft soils,focusing on the application of static sounding in soil type dividing,foundation bearing capacity estimate,undrained anti-shear strength,soil layer deformation index,natural density,plastic state determination and other aspects,it summarized and screened the empirical sounding formula applicable to the soft foundation of this expressway,and based on field test data,it obtained the bearing capacity eigenvalue of typical ditch-valley phase soft soil layer and cement mixing pile composite foundation in granite region,which are almost consistent with the field load test results,moreover,through linear regression analysis of test data,it summed up the static sounding empirical formula of this area,which can provide a reference for similar projects.