| Soft subsoil can be drained and consolidated with the action of plastic drainage board, which can shorten concretion time of soft subsoil and ensure the time limit for a project. The function and designing method are the same of plastic drainage board and bagged sand well, but the plastic drainage board is cheaper, faster and more convenient.Taking FU sun-rongxian segment rebuilding engineering of province road S305 as the background, the method which soft subsoil is disposed by plastic drainage board was studied. Engineering geology conditions of investigation section, including landform and hydrogeology characteristic, field character and basic physical and mechanical property of soft subsoil, were obtained through field investigation, in situ test and laboratory test. Ultimate bearing capacity of soil subsoil of road foundation center and critical build height of subsoil were analyzed and calculated while concretion degree is different. Using the soil mechanics theory, final settlement content of road foundation was calculated and the changing of settlement and concretion with time was analyzed before setting plastic drainage board and after setting those. At the same time, influence of soft soil thickness on settlement and concretion was disused. Which settlement content of road foundation was analyzed through finite element software before setting plastic drainage board based on equivalent theory. Farther, the effect of setting distance and length of plastic drainage board on content degree was analyzed. |
