浅析邯郸市东部第四系地层抗浮水文地质条件——以鑫都汇商业地块项目为例

An analysis of the hydro geological conditions of anti-floating in the Quaternary strata in eastern Handan city——Take the Xinduhui commercial site project as an example

随着我国社会经济发展水平的不断提高以及现代化城市进程的加速,地下空间不断得到开发利用,大量地下车库、下沉式广场等地下建筑的兴起,尤其是无上部建筑的地下车库、商场、下沉式广场等建筑物,查明场地水文地质条件就成了亟待解决的问题。在邯郸市建筑物基础抗浮工程中,尚未有建筑项目针对抗浮工程开展过专门的水文地质勘察工作。致使由于对建设场地及周边水文地质条件认识的局限和不足,造成抗浮工程造价过高、工程周期延长。以邯郸市东部鑫都汇商业地块项目所在地为典型研究区,通过周边调查及现场钻孔抽水试验等方式进行水文地质勘察,对邯郸市东部第四系地层抗浮水文地质条件进行评价分析。结果表明:邯郸市区处于山前冲洪积平原区,除上部包气带水之外,含水组大致分为0~30 m、30~80 m、80 m以下三段,上部较下部富水,机井单位出水量1.5 m^(3)/h·m,各含水段之间水力联系较为密切;从水文地质勘察成果看,实测场地周边地下水水位标高在+40.111 m~+43.244 m之间;对场地地基可能产生影响的地下水为包气带水和浅层水,可划分为②层粉土弱透水含水段、③-⑥层粉质粘土及粉土极微-中等透水含水段、⑦层细砂及粉砂中等透水含水段三个含水段。分析结论为地下空间开发利用提供可靠技术支撑。

With the continuous improvement of China’s socioeconomic development level and the acceleration of the modern urban process,underground space is constantly being developed and utilised,and a large number of underground buildings such as underground garages and sunken squares are emerging,especially underground garages,shopping malls,sunken squares and other buildings without superstructures,identifying the hydro-geological conditions of the site has become an urgent problem.No construction project in Handan has yet carried out a special hydro-geological investigation for anti-floatation engineering on building foundations.This has resulted in high costs and prolonged construction periods due to limitations and inadequate knowledge of the construction site and surrounding hydro-geological conditions.The site of the Xinduhui commercial plot project in the eastern part of Handan City was taken as a typical study area,and hydro-geological investigations were carried out by means of perimeter surveys and on-site borehole pumping tests to evaluate and analyse the float-resistant hydro-geological conditions of the Quaternary strata in the eastern part of Handan City.The results show that:the urban area of Handan is in the pre-hill alluvial plain area,except for the upper part of the packaged gas belt water,the water-bearing group is roughly divided into three sections from 0 to 30 m,30 to 80m and below 80m,the upper part is more water-rich than the lower part,the water output of the machine well unit is 1.5 m^(3)/h·m,and the water-bearing sections are more closely connected with each other hydraulically;From the results of the hydro-geological survey,the measured groundwater level elevation around the site ranges from+40.111 m to+43.244 m;The groundwater that may have an impact on the foundation of the site is water in the air pocket and shallow water,which can be divided into three water-bearing sections,②Vol.45 NO.4 layer of powdered soil with weak permeability,③-⑥layer of powdered clay and powdered soil with very slight-medium permeability,and⑦layer of fine sand and powdered sand with medium permeability.The conclusions of the analysis provide reliable technical support for the development and use of underground space.