摘要
武汉地区老黏性土大多呈硬塑—坚硬状态,工程性质较好,但同时具有遇水易软化、干湿循环条件下易崩解且一般具有不规则弱—中等膨胀潜势等特点。为了解武汉地区老黏性土用作路基填料的工程特性,该文以武汉市典型老黏性土作为研究对象,在搜集已有基础资料的基础上,开展基本物理特性、膨胀试验、击实特性、加州承载比(CBR)等系列室内试验,分析老黏性土作为路基材料的工程特性,验证其直接作为路基填料的可行性。根据试验结果,武汉典型老黏性土CBR2.5的测试值为1.8%~3.6%,平均值2.92%。CBR值呈现出随着最优含水率、塑性指数和自由膨胀率的升高而降低,呈负相关的趋势,难以直接满足主干路和快速路路基填料要求,需要进行必要的处置。
The old clay is mostly in the state of hard-plastic to hard,with good engineering properties in Wuhan area,but they are also easy to soften when exposed to water and disintegrate under dry-wet cycling conditions,and generally have irregular weak to medium expansion potential.In order to study the engineering characteristics of old clay used as roadbed filling in Wuhan City,taking typical old clay of Wuhan City as the research object,based on the existing basic data,a series of laboratory tests such as basic physical properties,swelling tests,compaction characteristics and California bearing capacity(CBR)are carried out to analyze the engineering characteristics of old clay and verify the feasibility of using as roadbed filling directly.According to the test results,the test value of CBR2.5 is 1.8%to 3.6%,and the average value is 2.92%.The CBR value shows a negative correlation trend of decreasing with the increase of the optimal water content,plastic index and free expansion rate.It is difficult to directly meet the requirements of the roadbed filling of the main road and the expressway,and necessary disposal is needed.
作者
邓青军
刘亚洲
田耿硕
代昂
Deng Qingjun;Liu Yazhou;Tian Gengshuo;Dai Ang(Wuhan Municipal Engineering Design and Research Institute Co.,Ltd.)
出处
《勘察科学技术》
2025年第6期1-6,共6页
Site Investigation Science and Technology
基金
武汉市政院科研课题(编号:Y10-2023013)
市政工程数字化勘察系统(Y10-2023033)。
关键词
老黏性土
路基填料
路用性能
加州承载比
old clay
roadbed filling
road engineering characteristic
CBR
