利用CPT确定安徽省沿江丘陵平原黏性土层地基承载力的方法研究  

Determination of bearing capacity of cohesive soils in hills and plains along the Yangtze River in Anhui Province based on CPT

作　　者：赵华宏[1,2] 吴道祥 叶磊[3] 郭佳诚 孟祥龙 吴磊磊 ZHAO Huahong;WU Daoxiang;YE Lei;GUO Jiacheng;MENG Xianglong;WU Leilei(Anhui Transport Consulting and Design Institute Co., Ltd., Hefei 230088, China;Research and Development Center on Technology and Equipment for Energy Conservation and Environmental Protection of Highway Transport, Hefei 230088, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)

机构地区：[1]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088 [2]公路交通节能与环保技术及装备交通运输行业研发中心,安徽合肥230088 [3]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2020年第10期1362-1369,共8页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(41002117);合肥工业大学产学研校企合作资助项目(W2019JSFW0733)。

摘　　要：采用静力触探(cone penetration test,CPT)方法确定地基承载力时需要与地区经验相结合。文章搜集了安徽省沿江丘陵平原地区百余份工程勘察资料,计算了主要土层黏性土的比贯入阻力ps值的算术平均值、厚度加权平均值和最小平均值,分析了它们的统计学特征及其与承载力特征值的相关性,并逐一进行拟合与分析。结果表明:3种平均值与承载力特征值均呈高度线性正相关;其中最小平均值与承载力特征值的相关性更为显著,它们的线性拟合回归方程效果最好,可作为利用CPT确定研究区黏性土层地基承载力特征值的经验公式。最后对某场地黏土层采用多种方法确定其承载力,对比分析结果表明,采用文中所提出的线性拟合经验公式确定的地基承载力安全可靠,该公式可用于工程实践。Cone penetration test(CPT)is a common method to determine the bearing capacity of foundation,but it should be combined with regional experience.In this paper,more than 100 engineering investigation data of the hills and plains along the Yangtze River in Anhui Province are collected,the arithmetic means,thickness weighted means and minimum means of the specific penetration resistance ps of cohesive soils(the main soil layers in the area)are calculated,their statistical characteristics and their correlation with the bearing capacity characteristic values are analyzed,and they are fitted and analyzed one by one.The results show that the three average values are highly linearly and positively correlated with the bearing capacity characteristic value,among which the minimum mean is more significantly correlated with the bearing capacity characteristic value,and their linear fitting regression equation is the best,which can be used as an empirical formula to determine the bearing capacity characteristic value of cohesive soils in the study area by using CPT.Finally,the bearing capacity of clay layer in a site is determined by many methods.The analysis shows that the bearing capacity of the clay layer determined by the empirical formula is safe and reliable,and the formula can be used in engineering practice.

关 键 词：静力触探(CPT) 比贯入阻力 地基承载力特征值 安徽沿江丘陵平原 回归方程 

分 类 号：TU413.9[建筑科学—岩土工程] TU470.3[建筑科学—土工工程]