| The suspension bridge has lots of characteristics, such as simple structure, clear Stress mechanism and it also has an advantage of more span less cost. Therefore, most domestic and foreign large span bridges which have been built or under construction are all suspension bridges. Gravity anchorage as a foundation of suspension bridge has a very important effect to suspension bridge’s stable and normal operation. Gravity anchorage will generate horizontal displacement and vertical settlement under its weight and main cable tension, meanwhile, the foundation has a huge additional stress because of its gravity. As we all know, these displacements will affect the stable of gravity anchorage, many field tests have been operated in the area of HuTiaoXia bridge. This paper analyzes the stable of gravity anchorage in the methods of static analysis and finite element software. Lots of researches have done in this paper as follow:(1)Based on test procedures of plate loading test and direct shear test, these tests are operated in the area of which gravity anchorage locates. At the same time, rock samples are collected in the same place to do some laboratory test. By combining field test with laboratory test, the basic physical parameters of rocks and bearing capacity of foundation can be detected finally.(2)By combining test results and design resources of the gravity anchorage, anti-skid stability coefficient, overturning stability coefficient and foundation additional stress of the gravity anchorage under main cable tension can be calculated through static analysis. The stability of gravity anchorage can be detected by comparing the standard.(3)On the basis of tested data, finite element software is used to build 3D model of gravity anchorage. This software can calculate horizontal displacement and vertical settlement as well as foundation additional stress to check whether the results satisfy the standard.(4)Through analyzing rock parameters including elastic modulus, cohesion, angle of internal friction, poisson’s ratio and density as well as main cable tension and cohesion between rock and gravity anchorage by using finite element software. Then the results can be used to compare these factors’ sensitivity to the stability of gravity anchorage. The conclusion can provide suggestions to select area which gravity anchorage to build, on the other side, it can supply reference to design and testify the main cable tension. |
