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保护规程中对建筑物下开采的可行性有所规定。对被采动建筑物产生作用最大的是沿建筑物长度分布平均地表变形,即水准点间距等于建筑物长度之半时的曲率。曲率的变化率不仅随间距减小而变大,而且随采深增加而变大。在一般采深的情况下,尽管地表曲率的变化率大大超过了地表倾斜的变化率,但是还只处在限定的范围之内,不超过曲率值。同时,地表曲率的变化率与采深和建筑物长度比值的平方成正比。当采深很大时,曲率值的超载系数可以增大到使计算
Provisions of the regulations on the feasibility of mining under buildings are stipulated. The most significant contribution to the building being mined is the average surface deformation along the length of the building, ie the curvature of the horizontal point at a distance equal to half the length of the building. The rate of change of curvature not only increases with decreasing distance, but also increases with depth. In the case of normal mining, although the rate of change of surface curvature greatly exceeds the rate of change of surface inclination, it is only within the limited range and does not exceed the value of curvature. At the same time, the rate of change of surface curvature is proportional to the square of the ratio of mining depth to building length. When the mining depth is large, the curvature of the overload coefficient can be increased to make the calculation