压力分散型抗浮锚杆承载特性分析

随着城市地下空间的开发,地下建筑物的抗浮问题越来越突出,采用抗浮锚杆是一种有效的技术手段。压力分散型锚杆是一种单孔复合的新型锚固体系,本文分析了压力分散型抗浮锚杆粘接应力、轴力和承载力特性,建立了轴对称有限元模型并进行了模拟分析,得到了轴力与粘结应力的分布规律。结果表明:压力分散型抗浮锚杆轴向应力以及锚固段砂浆体与土体间的剪应力均比压力型锚杆得到了改善,其受力与载荷传递机制更具合理性。

Characteristic analysis on compression-dispersive anti-float anchor

With exploiting and utilizing urban underground space,the problem of anti-float of underground structures has become increasingly serious.Therefore,anti-float anchor is an effective technical means.Pressure-dispersive anti-float anchor is a new style of anchor system which is a single-bore multiple-anchorage.It is more reasonable in load transfer,more uniform in bond stress dispersal.The stress dispersal characteristic,axis-force and the loading mechanism of the pressure-dispersive anti-float anchor are analyzed.The axis-symmetric fem models are created by using the ANSYS fem software and simulated.Moreover,distribution of axis force and the bond stress is obtained through the analysis.Compared with pressure anti-float anchor,pressure-dispersive anti-float is more reasonable in load transfer,more uniform in cohesion stress dispersal.