摘要
水平-竖向(H-V)加筋是在传统水平加筋基础上布置不同形状的竖筋所形成的空间加筋体系之一。针对包含(非满布)环状竖筋的典型H-V加筋方式,结合已进行的H-V加筋黏性土三轴试验,分析H-V加筋黏性土的工作机理,即H-V加筋的作用不仅体现在水平加筋的摩擦效应,而且还表现在竖向加筋的侧向约束作用,在H-V加筋中被竖筋包围的土体会形成挤密区,当荷载达到极限值时,竖筋将发生倾覆。分析中将竖筋的侧阻作用简化为侧向土压力,按极限平衡状态计算竖筋两侧的主动土压力与被动土压力,并将其转换为筋条上的水平径向拉力。在水平加筋强度理论基础上,推导H-V加筋黏性土摩擦型破坏条件下的强度公式,并与试验值进行对比验证,结果表明二者较为接近。
On the basis of conventional reinforcement with horizontal inclusions,the horizontal-vertical（H-V） inclusions lay the vertical inclusions with different shapes to form a three-dimensional reinforcing system.For the vertical inclusions laid as circles（not fully distributed） in the soil under axisymmetric condition,the mechanism of the cohesive soil reinforced with horizontal-vertical（H-V） inclusions is analyzed based on the triaxial tests,which indicates that the effectiveness of the system is not only due to the friction effect but also the additional lateral resistance of the vertical inclusions.In the H-V reinforcement,the soil surrounded by vertical inclusions forms a dense area,the vertical inclusions become inclined when the load reaches the ultimate value.Strength analysis of frictional failure is conducted by means of the strength theory of conventional reinforced soils,and the results of analytical prediction are compared with those from the triaxial tests.
出处
《土木工程学报》
EI
CSCD
北大核心
2010年第8期115-120,共6页
China Civil Engineering Journal
基金
国家自然科学基金(50678100
40972192)
关键词
H-V加筋
黏性土
摩擦型破坏
作用机理
强度分析
horizontal-vertical（H-V） inclusions
cohesive soil
frictional failure
mechanism
strength analysis
