静载荷下黄土地基矩形地下连续墙现场试验研究  

In-situ static vertical loading test on rectangular diaphragm wall in loess subgrade

作　　者：宋章[1] 程谦恭[1] 龚维明[2] 陈晓东[3] 

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]东南大学土木工程学院,南京210096 [3]中交公路规划设计院,北京100010

出　　处：《岩土力学》2008年第10期2713-2718,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.40172093);国家杰出青年基金(No.40025103);交通部西部交通科技建设项目(No.200331849457)资助

摘　　要：采用自平衡测试技术,在国内外首次进行了竖向静载荷作用下黄土地基中矩形地下连续墙现场试验研究,根据测试结果及黄土的物理力学性质,对黄土地基中矩形地下连续墙的荷载传递性状进行了详细分析。结果表明:黄土地基中矩形地下连续墙的承载特性具有端承摩擦桩的性质;墙的承载力由墙侧摩阻力和端阻力共同承担;墙侧摩阻力和端阻力的发挥与墙土的相对位移量及黄土的物理力学性质等因素有关;墙体达到极限荷载时,墙端阻力荷载分担比为40.3%;各土层墙侧摩阻力随着墙土相对位移的增加而增大,但其增长幅度不等;加载时墙身轴力在加载处最大,随着各土层墙侧摩阻力作用的发挥,墙身轴力随着离荷载箱距离的增加而减小。An in-situ static vertical loading test of rectangular diaphragm wall in loess subgrade, for which a self-balanced method was employed, was performed firstly at home and abroad. According to the testing results and based on the physico-mechanical properties of loess, load transfer characteristics of the rectangular diaphragm wall in loess subgrade were analysed in detail. The results indicated： beating characteristics of rectangular diaphragm wall in loess subgrade behaved the properties of end support friction piles; bearing capacity of rectangular diaphragm wall in loess subgrade consisted of lateral frictional resistance and end resistance; development of lateral frictional resistance and end resistance of diaphragm wall were related to the factors, such as the relative displacement of the diaphragm wall and loess, the physico-mechanical properties of loess and so on; the load sharing ratio of end resistance of diaphragm wall was 40,3 percent while reaching the ultimate load; the lateral resistance of diaphragm wall was increasing gradually with the augment of the relative displacement of diaphragm wall - loess, but with different increment in loess layers; the maximum axial force of diaphragm wall located the position of loading, with the development of the lateral resistance of diaphragm wall in loess layers, the axial force was decreaing while the distance of the load box is increasing.

关 键 词：黄土地基 地下连续墙 竖向承载力 侧摩阻力 现场试验 

分 类 号：TU413.4[建筑科学—岩土工程]