The Numerical Simulation Of The Steel Slag Which Is As A Large Volume Of Foundation Filler In Panzhihua Iron And Steel Company

The expansion which caused by temperature is an important issue that the steel slag foundation are facing. The external heat and steel slag reacts with water when release a lot of heat, the heat accumulation can result the temperature increase of steel slag foundation. The expansion which are caused by the temperature increase will cause the deformation or even destruction of the upper part of the building. In order to study the impact of buildings which is built on the surface of the steel slag foundation which are used as materials of foundation backfill in PISC(Panzhihua Iron and Steel Company) under the action of an external heat source, this paper study from the following aspects:1,Summarizes the research and application status of domestic and international steel slag, introduces the research and application status of the steel slag which are used as materials of foundation backfill in PISC,the development status of steel slag project, and the numerical simulation status of steel slag foundation.2,Measuring the temperature of slag field through the geological exploration drill; According to the temperature transfer law and the temperature which are measured in slag field, we can supplement the temperature in the horzontal and depth direction of the steel slag foundation, and get the temperature distribution of the whole steel slag foundation in the temperature measuring moment, the temperature distribution as the initial conditions in follow-up to calculate.3,The area which are furnished the production line in the upper surface of steel slag foundation model, are imposed a constant heat source which are 60℃and 120℃simulation the heating effect for the steel slag foundation by the high temperature production line; Calculate and get the temperature field after imposed the heat source two, five and ten years; Compare and analyse the temperature distributions at the different heating time by the same heat source, and compare and analyze the temperature distributions at same heating time by the different heat source, and obtain the effect of the temperature distribution by heat source.4,The temperature distributions in different years are used as the temperature load in the displacement field calculation, and get the amount of displacement among the different years. The displacement in the surface of each drill are the main parameters considerd, it reflects the displacement of foundation surface, the upper part of building lift with the explansion of foundation.5,According to the calculation results of the temperature field and the displacement field, make some suggestions that can reduce differential settlement for the construction is built on the steel slag foundation, minimize the impact which are brought by the expansion of the steel slag foundation to the construction.The results show that:comparison of the results of the temperature fields can know, under the heat of 60 and 120 degrees, warming depth of pure slag layer in the first ten years will attain 30m and 40m, the region which the rock layer is thicker increase the depth of warming, in particular the warming depth of the case of 120 degrees heat sourse achieve 45m, the warming of rock layer is obvious. We will know by comparison and analysis of the structural field, the displacement in the model surface caused by the temperature, it is uniform in the area which the depth of slag layer is above 35m and little change in the thickness. The displacement is uneven in the area which the depth of slag layer is less than 20m, the displacement difference of each point more than 10cm, even greater in certain regions. However, the area which is without heat source on the model surface and far away from the heat source, the influence of temperature can be ignored.We get the conclusion by analyzing the computer results:For the heat source area, we should strengthen the heat dissipation and insluation measures, to reduce the heat transfer to the underlying foundation, especially the area which slag is thin. Because the foundation may occur uneven settlement, the impact which caused by the differential settlement should be considered in the region that the rock layer is thicker.