Application Study On The Application Of Foam Concrete And Filling Of The Back Of Platform

Along with the rapid development of highway and bridge construction in our country. The number of highway structures such as bridges, tunnels and other structures are also increasing in the course of the construction of bridges. After the construction of this kind of structure is put into operation. The abutment and the backfilling sections are significantly different settlement. Lead to the occurrence of the wrong station, “jump the car”and other engineering diseases. Affect the economic benefits of highway engineering construction seriously. Based on the actual engineering data. Comprehensive using laboratory test, numerical simulation, theoretical analysis of research methods, from the foam concrete laboratory test parameters, abutment backfilled sections difference change regularity of settlement, abutment stability state change research. The results obtained are as follows:(1) the configuration of different ratio of foam concrete experiments are carried out analysis of the changes of the physical and mechanical properties of comparison of different water cement ratio, different bubble content and different water content rate of foam concrete, concludes that the variation of various parameters on the properties of foam concrete influence law. That the compressive strength and elastic modulus of foam concrete in water cement ratio is gradually increasing, showed the trend of first increased and then decreased, the rate of water cement ratio is 0.55 reached the peak. Under the effect of bubble content and water content, strength and elastic modulus decreased, and with the increase of the bubble content, the bubble content changes on the properties of foam concrete effect more obvious.(2) based on the data obtained from the laboratory tests, combined with geotechnical engineering analysis software, back of bridges and culverts and backfilling sections of the settlement deformation, the variation rule of the numerical simulation analysis. Use of lightweight foam concrete as abutment backfill material, compared with the conventional gravel packing, put into operation in the backfill section of the settlement deformation was decreased; with the increase of the water cement ratio, foam concrete backfill section of the settlement decreases,the foam concrete and gravel soil back fill differential settlement increases gradually, is notconducive to different filler at the junction of the differential settlements at the smooth transition; When the bubble content and water content increased, the foam concrete backfill section settlement increases, the foam concrete and gravel backfill differential settlement decreases, to different filler at the junction of the differential settlements at the smooth transition.(3) The use of geotechnical engineering stability analysis software of the numerical simulation and analysis of single factors, variation of embankment stability. Using lightweight foam concrete to carry on the back filling, and in the case of no cone slope, the stability of the traditional gravel soil platform is obviously improved. The influence of foam content on the stability of bridge abutment is obvious, and the safety factor of the bench is decreased with the increase of the foam content, and the speed is decreased gradually; The water absorption of foamed concrete is poor, the moisture content is 3.03% that is saturated, although with the increase of moisture, Taiwan back safety coefficient decrease, but the change is not obvious.