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某实验楼高3层(局部4层),砖混结构,条形基础,基底埋深1m;地基持力层为泥岩(承载力400kN/m~2)。基地内有一防空洞穿过,防空洞毛洞尺寸为2×2.7m,采用300mm厚条石直墙圆弧拱顶,条石300号,砂浆50号;拱顶与基岩间有约200mm厚的一层松散填充物。该建筑场地按总平面布置降坡1.5m,设计的基础底面距防空洞顶只有1.5m。一、处理方案的确定基础工程遇防空洞时,首先应根据防空洞的实际情况,验算其被覆结构的承载能力。当防空洞的被覆结构承载力能够承受基础传来的荷载时,防空洞不需加固处理。这
A laboratory building has 3 floors (local 4 floors), brick-concrete structure, strip foundation, and basement depth of 1m; foundation bearing layer is mudstone (bearing capacity 400kN/m~2). There is an air-raid shelter in the base. The size of the air-hole in the air-raid shelter is 2 x 2.7m. 300mm-thick stone-wall straight arches, 300-stone, and 50-mortar are used. There is a 200mm-thickness between the dome and bedrock. Layer loose filler. The building site is downgraded by 1.5m according to the general layout, and the design base floor is only 1.5m away from the roof of the air defense tunnel. First, the determination of the treatment plan When the basic project is in the case of air-raid shelter, the bearing capacity of the covered structure should be checked first according to the actual situation of the air-raid shelter. When the bearing capacity of the shield structure of the air-raid shelter can withstand the load transmitted by the foundation, the air-raid shelter does not need reinforcement. This