›› 2009, Vol. 30 ›› Issue (7): 2031-2036.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mechanical characteristics of straight brace considering displacement of foundation pit and direction of earth pressure

SONG Ming-jian1, 2, TANG Lian-sheng3, HU Hui4, WANG Da-zhi3, XU Tong3   

  1. 1. School of Engineering, Sun Yat-sen University, Guangzhou 510275, China; 2. ZHONGCHENG Group, Chengdu 610072; 3.Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China; 4. College of Civil Engineering, Jinan University, Guangzhou 510632, China
  • Received:2008-09-16 Online:2009-07-10 Published:2011-03-10

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Abstract:

It is generally realized that earth pressure will change with the deformation and displacement of foundation pit. But at present the design of straight brace does not almost consider earth pressure changing with displacement of foundation pit. Firstly, the researches and achievements on the nonlinear relation of earth pressure and the displacement of foundation pit are summarized. Secondly, the rules on earth pressure changing with the displacement and movement of the side of foundation pit are discussed. On the basis of the present researches and the change rules on earth pressure changing with displacement of foundation pit, new formulas of axial force and deformation of straight brace considering the rotation or movement of the side of foundation pit are presented. At last, the curves of axial force and deformation of straight brace changing with some factors are obtained. Those factors include different initial displacement of foundation pit, supporting location of straight brace, friction angle of soil and retaining structure, resultant force action point of earth pressure. Conclusions can be drawn as follows from these curves: axial force and deformation of straight brace will diminish with the increase of displacement of foundation pit, supporting location height of straight brace and friction angle of soil and retaining structure. The height enhancement of resultant force action point of earth pressure will improve axial force and deformation of straight brace. But the initial displacement of the side of foundation pit has no influence on axial force and deformation of straight brace.

Key words: brace, straight brace, foundation pit, earth pressure, displacement

CLC Number: 

  • TU 443
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