PARAMETER-M IDENTIFICATION BASED ON HORIZONTAL DISPLACEMENT OF PILE AND AXIAL FORCE OF BRACING STRUT IN SUBWAY STATION PIT
Parameter-M is the proportion factor of horizontal soil reaction when the soil is compressed horizontally,and the corresponding method of pit retaining structure analysis is named as M-method. Mmethod is widely used to determine the working state of pit retaining structures in China,however,parameter-M varies significantly when deduced by different approaches. An analysis unit is chosen in the subway station pit in Zhengzhou,center of China,on the bank of Yellow River. The retaining structure consists of reinforced concrete piles,internal bracing struts made of steel pipes. The horizontal displacements of retaining piles and the axial forces in pipe bracing struts are monitored in-situ. Then,calculation assumption is taken as that during the elastic deformation stage,parameter-M for each soil keeps constant. Then a series of equilibrium equations of forces acting on retaining structure are set up to determine the values of M for each soil corresponding to deferent stages of excavation. When the identified values of M are applied in the later projects,it shows the validity and accuracy of the method. Precise values of M are applied in the similar geological sites to optimize the retaining structure design.
Horizontal soil reaction proportion factor M Subway station pit Retaining structure In-situ monitoring Displacement Axial force in bracing strut
Jian-Xue Song Xiang-Yu Bai Yong-Liang Zhai
Civil Engineering School,Zhengzhou University,Zhengzhou,Henan,450001,P.R. China Civil Engineering School,Xinxiang College,Xinxiang,Henan,453000,P.R. China
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
1006-1011
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）