砖混结构的民用建筑如：教学楼、宿舍楼、住宅楼等，一般按线荷载计算时，在纵横墙交结处，由于基础面积重叠，可能使总的基础面积小于建筑物总荷载所需的基础面积，基底压应力超过地基容许承载力，在软弱地基上尤为突出，对于一般住宅，当基底压力超过地基承载力２０－３０％ Civil-construction buildings of brick-concrete structure, such as teaching buildings, dormitory buildings, residential buildings, etc., are generally calculated according to the line load. At the intersection of the vertical and horizontal walls, due to the overlap of basic areas, the total base area may be less than the total building load required. Foundation area, base compressive stress exceeds allowable bearing capacity of foundation, especially prominent on soft foundation, for general residence, when base pressure exceeds the bearing capacity of foundation by 20-30%