输电线路大型铁塔膨胀土基础原型抗拔试验土体破坏机理分析

以邯郸至石家庄500 kV输电线路铁塔基础设计与施工为例,通过现场抗拔模型和现场抗拔原型 试验中出现的膨胀土破裂面和地表裂缝,深入分析了膨胀土裂缝的产生机理,并结合有限元计算方法,准确揭示了 膨胀土中大型抗拔基础的抗拔机理、填土及基础中的抗拔应力状态及破坏形态,对目前的一些流行观点和现行规 范“计算直线杆塔基础上拔稳定时,对塑性指数大于10的亚粘土和粘土可取天然容重”提出了修订意见。

A breakage mechanism analysis of soil body in antetype resisting draw tests of large-scale iron tower groundwork for transmitting electricity line

With the design and construction of 500 kV transmit electricity iron tower foundation from Handan to Shijiazhuang as a case,by analyzing the expansive soil cracking surface and surface crack shape in model and live antetype resisting draw tests,the paper reviewed the theory of expansive soil crack thor oughly. Combining the finite element computing method,the paper also revealed the resisting theory,filling soil and resisting draw stress state & destroying form of expansive soil in large-scale resisting draw foundation,and put forward revised ideas against actual prevail views and present criterion,that is,when calculating stabilization of straight line bacilliform tower foundation being drawn,the natural unit weight of dauk and clay of plasticity index over 10 can he adopted.