Case analysis of sudden cracking in buildings near landfill pit

Abstract

The causes of cracks in 6-storey building are studied. Based on analyses of crack morphology, settlement observation and geological survey, it is determined that the landfill pit and uneven settlement is the main cause of cracks. The July 20th Zhengzhou Rainstorm caused a sharp rise of groundwater level, so that the uneven settlement of the office building near the landfill pit intensified, and then the wall cracking is followed. The interaction between buildings and landfill pits under different water levels is studied by three-dimensional numerical simulation. As the water level rise, the horizontal displacement of soil in the landfill pit increase, and the lateral constraint of landfill soil to foundation soil decrease, the result is that the settlement of column foundation near the landfill pits increases and the differential settlement intensifies. According to the analysis results, the further development of differential settlement and cracks are evaluated and the treatment suggestions are given.