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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。
The horizontal-vertical (H-V) stiffener is one of the space-stiffened systems formed by arranging different shapes of vertical bars on the basis of traditional horizontal stiffeners. In view of the typical HV stiffener method, which includes (irregularly filled) annular cantilever bars, the working mechanism of HV stiffened cohesive soils is analyzed in combination with the triaxial test of HV stiffened cohesive soil. Which is reflected in the frictional effect of horizontal reinforcement, but also in the lateral restraint effect of vertical reinforcement. In the HV reinforcement, the soil surrounded by vertical reinforcement will form a compaction zone. When the load reaches the limit value, Tipping occurred. In the analysis, the lateral resistance of the vertical bar is simplified as the lateral earth pressure, and the active earth pressure and the passive earth pressure on both sides of the vertical bar are calculated according to the limit equilibrium state and converted into the horizontal radial tensile force on the tendons. Based on the theory of horizontal reinforcement strength, the strength formula of H-V reinforced clay under frictional failure condition is deduced and compared with the experimental value. The results show that the two are close.