Analysis Of Permeable Rain-water Pipe Bearing Capacity

The traditional rain water pipes only discharge and do not store,which leads to the hardening of the underlayer of the ground.The pervious rain water pipe is a new water pipe technology which promotes the infiltration of rain water and forms the water circulation path.In this paper,based on the analysis of the annular and longitudinal bearing capacity of the pipe body after the opening of the rain water pipe,the specific influencing rules are obtained,so as to further guide the production and popularization of the water-permeable rain water pipe.In this paper,the destructive test and ABAQUS finite element numerical simulation are carried out on the annular and longitudinal bearing capacity of the rain-water pipe after opening.Main research contents and results are as follows:(1)the permeability storm sewer ring to the bearing capacity of contrast test with ordinary storm sewer,water permeability storm sewer due to opening form weak side early cracks in around and around to form stress concentration after stress redistribution,the permeability of storm sewer deflection deformation is bigger,the stress concentration development,finally to concrete crushed terminated,reinforced no damage.The increase of hole diameter makes the stress concentration effect more obvious,the increase of hole number makes the weak surface of pipe body greatly increase,and the density of hole spacing makes the stress between the spacing cannot dissipate and the earliest failure.(2)establish the ABAQUS finite element model for the corresponding test to conduct the whole process analysis and demonstrate the reliability of the test.By extending the reference group of the test,it is concluded that under a single influence factor,the annular bearing capacity decreases with the increase of the opening rate,and the decreasing range gradually flattens out.(3)the full-size longitudinal bearing capacity test was carried out for the two types of rain water pipes,and the ultimate failure index was crack width over 1.5mm.Due to the dispersion of stress caused by the existence of holes,the cracks in the water-permeable rain water pipes were more rather than wider than that of ordinary rain water pipes,so the cracks of the water-permeable rain water pipes were earlier,but the damage was later.The deflections of the water-permeable rain water pipes are larger,and the stress neutral axis moves up after cracking.Finally,the concrete and steel bars do not yield,and only the crackwidth reaches the target.(4)according to the finite element simulation conducted by the test,the stress of concrete and steel bars was large when the final failure occurred,but the concrete was not crushed,so the overall stress was Shared by both of them.Through the finite element modeling,the expansion analysis was carried out,and the longitudinal bearing capacity first increased slightly and then decreased rapidly with the increase of the opening rate.(5)combined with the research conclusions of the two,the longitudinal bearing capacity can be satisfied only by considering the opening ratio that meets the annular bearing capacity in practical application.