地下工程施工对房屋影响的损害评价

随着城市地铁、公路隧道等地下工程数量越来越多,浅埋隧道近距离穿越建筑物的现象明显增多。如何评价地表房屋的受影响程度是隧道安全穿过房屋的首要前提之一。首先根据房屋的实际情况,确定房屋在隧道施工前的损坏情况;然后参考房屋损坏评价标准,确定房屋的控制损坏等级和极限变形值,将房屋的极限变形值与房屋损坏等级所对应的变形值之差即得房屋的容许变形值;最后采用三阶段分析法对隧道施工诱发房屋的损害进行评价。如果该分析评价法的各阶段计算结果均超出房屋的容许变形值,则需对房屋采取相应的加固措施,从而保证隧道顺利通过房屋。同时,该评价方法对同类工程具有参考价值。

Assessment Method of Buildings Damage Induced by Underground Construction

With increased urban highway tunnel construction in P.R. China,there are more shallow cover tunnels passing under buildings.Finding a means to appraise buildings' degree of damage is one of the most important preconditions so that tunnels can safely pass under buildings.First,the instance of damage should be confirmed according to the buildings' actual settlement.Then, referring to the buildings damage evaluation criteria,the buildings' control damage rank and critical distortion value can be determined.The permissible distortion value can be drawn from the difference of buildings' critical distortion value and distortion value corresponding to its damage ranking.Finally,a three-stage appraisement is carried out to assess the degree of buildings' damage induced by tunnel construction.If every stage's calculated result of this appraisement exceeds buildings' permissible distortion value,the buildings should be reinforced to assure that the tunnels could pass through safely.At the same time, the calculation method has important reference value for the similar projects.