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矿井巷道在贯通过程中会遇到各种情况的变化。如地质条件的改变,测量的误差,施工中线的位移,巷道塌冒的发生以及巷道用途的变更等,都可能在原有设计巷道的基础上,进行局部巷道的修改。修改时按新的测量数据,并要符合几何条件,则必须以特殊的公式进行处理计算,才能达到工程的质量要求与设计规范的规定。一、曲线巷道遇地质变化改变半径的计算曲线巷道中线ACB(见图1),其半径等于R_1。VA、VB为切线。假设曲线巷道刚施工就发现地质有变化,若按原有设计进行,到达B点时可能会透水,必须把VB切线向内平行移动一个P距离,依新的切线V′B′位置就能避免发生水患。
Mine tunnel in the process of penetration will encounter a variety of circumstances change. Such as the changes in geological conditions, measurement errors, the displacement of the construction center line, the occurrence of roadway collapse and the use of roadway changes, etc., may be based on the original design of the roadway, the local alley modifications. Modify the new measurement data, and to meet the geometric conditions, it must be calculated with a special formula to achieve the project’s quality requirements and design specifications. First, the curved laneways meet the geological changes in the radius of the calculation curve Lane center line ACB (see Figure 1), the radius is equal to R_1. VA, VB for the tangent. It is assumed that the geology of the curve tunnel has just been found to change. If the design is carried out according to the original design, it may be permeable when reaching point B. The VB tangent must be moved parallel to the inside by a distance of P, and the new tangent V’B ’can be avoided Flooding occurs.