Treatment And Optimum Design Of Anti-slide Pile Of Tongkeng Landslide In Yongkang, Zhejiang Province

Tongkeng landlide in Yongkang,Zhejiang province locate on the Yongkeng Hou hill where is in the north-east of Yong Kang city about 19.3km. Because of flood season strong precipitation and human project activity, the landslide since April, 1993, has had many times the varying degree slipping. This is very dangerous. Especially, the activity of the landslide makes the public dismay, and affects the society stability. Therefore, research and prevention of the landslide has important practical and theoretical significance.By the way of surveying geological environment,evaluating the stability and calculating the residual slip force of Tong Ken landslide , this paper presents three comprehensive treatment projects on the ground of analyzing the cause and contrasts them through three several aspects of construction,treatment effect and engineering cost. The comprehensive treatment project of Tong Ken landslide consists of whittling slope,anti-landslide pile with anchoring cable,retaining wall,building ground drainages leveling off and calking slope,vegetation protection etc. After managing, under the action of earthquake load and watery the stability coefficient of landslide is up to 1.10.Then, this text researches the structural optimization design of anti-slide pile with anchoring cable. On the condition that the width of section is invariable, the height of section is confirmed by structural optimization method. This will change traditional method to optimize the height of section so that design is simplified and cost is lower.This paper presents one optimization design method. The objective function is the cost of anti-slide pile' s per meter; The constraint conditions are the strength of anti-slide pile' s normal section and inclined section, the ratio of reinforcing design and the size of section in the design code; The design variables are the height of section, the area of reinforcement and the amount of hoop. And the optimization model is solved by 0.618 method. In the course of optimization design of anti-slide pile' s structure, when the height of section changes, the internal force of anti-slide pile will change. To solve this problem, in this paper, the internal force in the constraint conditions are modified when the height of section changes.