Research And Application Of Anti-floating Anchor In The Underground Engineering

With the developing of economy,the use of underground space is extensive,leading to the anti-floating problem of underground building(structure)more and more prominent,if not handled it properly,it will lead to the whole building instability,which is a serious risk for security.All of these mean solving the problem of anti-underground building becomes extremely important.The main anti-floating measures have lower cut-off and drainage method,counterweight method,anti-floating pile,anti-floating anchor and other methods.Because the spacing of the anti-floating anchor is small,basement floor needed to balance the bend distance and shear also very small,leading the floor can be made very thin,which can significantly reduce the cost of the project.And the layout of anti-floating also very flexible and the anchoring efficiency advantages making it widely used.In this paper,the main research results are as follows:(1)This paper first expounds the anti floating anchor in the domestic and foreign research status of the application of anti floating engineering and anti floating anchor,and the influence of stress mechanism,factors,anti floating anchor pullout force of anti floating anchor destruction form and the deformation of the anti floating anchor rod is studied.(2)Research shows that the anti floating anchor pullout resistance is not increased with the increase of anti floating anchor length and infinite increase indefinitely,but there is a "critical length".More than the "critical length",gradually decrease with the increase of the length of the anti floating anchor pullout force of anti floating anchor increase.(3)Groundwater is the main source of buoyancy of groundwater,this paper for underground construction(structure)to build the buoyancy effect principle and the size of buoyancy of groundwater are analyzed.And the present different specification given by the anti floating anchor design methods are compared and analyzed.(4)Gives a method of field of anti floating anchor test and test data.(5)In this paper,for the existing underground engineering reinforcement floating instability are studied,analyzed the reasons of the engineering stability floating loss,proposed to use the anti floating anchor anti floating reinforcement.(6)Given the existing design methods,reinforcement engineering of anti floating anchor construction technology...