乌鲁木齐机场戈壁砾石土填料的工程特性试验研究  

Experimental Study on Engineering Properties of Gobi Gravel Soil in Urumqi Airport Foundation

作　　者：张煌 邓松 万星 丁建文[1] ZHANG Huang;DENG Song;WAN Xing;DING Jianwen(School of Transportation,Southeast University,Nanjing 211100,China)

机构地区：[1]东南大学交通学院,江苏南京211100

出　　处：《防灾减灾工程学报》2021年第6期1301-1307,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省研究生科研与实践创新计划项目(No.SJCX18_0045)资助。

摘　　要：以新疆乌鲁木齐机场改扩建工程中道基填筑拟采用的戈壁砾石土填料为研究对象,开展了戈壁砾石土的颗粒分析、表面振动压实、点荷载强度等物理力学试验,对其颗粒特征、压实特性以及大粒径砾石强度展开了探讨。结果表明:该地区戈壁砾石土不均匀系数C_(u)为37.9,曲率系数C_(e)为2.12,属于级配良好的砾类土,且填料在1~2mm粒组处存在一定程度的缺失;不同粗颗粒含量戈壁土均存在明显的最优含水率与最大干密度,最大干密度随含水率变化呈现抛物线形式,且随着填料粗颗粒含量的增加而增加;天然级配的戈壁砾石土粗颗粒含量超过70%,最大干密度可达2.41 g/cm^(3);另外,戈壁砾石土中大块砾石的强度较高,自然风干状态下单轴抗压强度的平均值约为60 MPa。试验得出乌鲁木齐机场建设采用的天然级配的戈壁砾石土是一种非常好的道基填筑材料,研究结果亦可为类似工程提供参考。Gobi gravel soil was adopted as fillings in the expansion construction of Urumqi International Airport. A series of physical and mechanical tests including particle gradation,surface vibration compaction and point load strength tests were conducted to analyze particle features,compaction characteristics and particle strength of Gobi gravel soil. The results indicate that Gobi gravel soil is well graded with a non-uniform coefficient Cu of 37.9 and a curvature coefficient Cc of 2.12,and there exists an extent of missing in the grain group from 1 mm to 2 mm. The optimum moisture content and maximum dry density of Gobi gravel soil change with coarse particle content predominantly. The maximum dry density varies with moisture content in a parabolic form,and increases with coarse particle content constantly. The maximum dry density of natural Gobi gravel soil reaches 2.41 g/cm;with more than 70% of coarse particle content. The large particle of Gobi gravel soil is featured by high strength,and the average uniaxial compressive strength in natural air-dried state is about 60 MPa. The tests show that natural graded Gobi gravel soil is a kind of well-performed subgrade filling material for the construction of Urumqi Airport. The conclusions can also provide suggestions for similar projects.

关 键 词：戈壁砾石土 室内试验 颗粒分析 压实特性 点荷载强度 

分 类 号：TU443[建筑科学—岩土工程]