确定斜坡地基比例系数m值的模型试验研究  

Model Test Study on Identification of Foundation Proportional Coefficient min Slope Ground

作　　者：尹平保[1,2,3] 赵明华 贺炜[2,3] 赵衡[4] 张建仁 

机构地区：[1]长沙理工大学道路灾变防治及交通安全教育部工程研究中心,湖南长沙410114 [2]长沙理工大学土木与建筑学院,湖南长沙410114 [3]现代公路交通基础设施先进建养技术湖南省协同创新中心,湖南长沙410114 [4]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2017年第9期158-164,共7页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51408066;51478051;51608540);湖南省教育厅优秀青年项目(16B013);长沙理工大学道路灾变防治及交通安全教育部工程研究中心开放基金项目(kfj140405);长沙理工大学土木工程优势特色重点学科创新性项目(16ZDXK02)~~

摘　　要：为研究斜坡坡度及水平荷载作用角度对斜坡地基比例系数m值的影响,设计并完成了一系列斜坡地基刚性桩水平承载室内模型试验,测得了不同斜坡坡度及水平荷载作用角度下地基比例系数m值.试验发现:斜坡地基比例系数m值随地面处桩身水平位移x、斜坡坡度α及水平荷载作用角度β增加呈非线性减小,当x>10mm时,m值几乎保持为一定值,并据此建立了斜坡地基比例系数m值与坡度α及荷载作用角度β之间的拟合关系式.理论与试验对比分析表明:根据考虑斜坡空间效应影响确定的斜坡地基比例系数m值,计算得到的桩身内力、位移与实测结果最接近,最大计算误差小于10%;斜坡桩基设计时,建议取地面处桩身水平位移x=10mm对应的m值.To examine the influence of slope angles and horizontal loading angles on the foundation proportional coefficient m in slope grounds, model tests of in-slope steel piles were designed and implemented, and the m-values under different slope angles and horizontal loading angles were then obtained.Model tests revealed that the m-value decreased nonlinearly with the increase of the slope angle a, horizontal loading angle β and lateral displacement x of piles at the ground surface.The m-value almost kept the same when the value of x was more than 10 mm.Moreover, the relationship among m-value and slope angle a and horizontal loading angle β was established. The contrastive analysis showed that the theoretical calculation result under the consideration of the slope space effect when determining the m-value was close tothe test result, and the maximum error was no more than 10%.It is suggested to adopt the m-value when the value of x is 10 mm for the design of in-slope piles.

关 键 词：地基比例系数 模型试验 斜坡桩 斜坡空间效应 水平荷载 

分 类 号：TU473[建筑科学—结构工程]