试论连云港海相软土路堤沉降规律  

Settlement features of embankment of Lianyungang marine clay

作　　者：章定文[1] 刘松玉[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《岩土力学》2006年第2期304-308,共5页Rock and Soil Mechanics

基　　金：教育部博士点基金资助项目(No.2001028618)

摘　　要：根据连云港至徐州高速公路连云港段60多个断面的现场实测沉降资料,分析了在路堤荷载作用下连云港海相软土的沉降和固结规律。实测数据表明,在路堤荷载作用下连云港海相软土地基的沉降曲线符合双曲线形式,故可采用双曲线法预测最终沉降。由此可以分析在不同施工期的地基沉降和固结特性,得到不同地基处理条件下路堤填筑期和预压期地基平均固结度与施工时间的关系。分析亦表明,粉喷桩加固能加速地基的固结速率。最后,针对沉降和固结理论计算中计算参数的难以合理确定的局限性,对现场实测沉降数据采用数理统计方法,提出了适用于连云港地区海相软土路堤沉降和固结估算经验公式。Time-settlement data of more than 60 different sections of the 31.2 km long Lianyungang-Xuzhou expressway in Lianyungang segment are analyzed. The results indicate that the time-settlement behavior could reasonably be represented by the hyperbolic relationship. According to the estimated long-term settlements, the consolidation characteristics of soft ground improved by using sand mat or dry jet mixed columns are analyzed. The relationships between average degree of consolidation and time in the filling-term and the preloading-term are studied respectively. Results indicate that the presence of dry jet mixed columns could accelerate the consolidation rates of soft ground; although soil-cement columns are considered to be impermeable. In addition, an empirical estimating formula for the magnitude and rate of consolidation settlement of Lianyungang marine clay are proposed by the method of statistics.

关 键 词：路堤 海相软土 沉降规律 砂垫层 粉喷桩 同结特性 

分 类 号：TU443[建筑科学—岩土工程]