隧道横向贯通测量误差调整方法浅议

Elementary discussion of adjusting method of lateral breakthrough survey error of tunnel

隧道贯通误差对隧道的顺利贯通有重要影响。《工程测量规范》对不同长度隧道的横向贯通误差有相应的规定。若误差在允许范围内,则采用常规方法处理;若超出,则要采用合理的方法予以调整。本文以某隧道施工为例,测定了贯通误差的大小,并针对该误差的大小设计了两种误差调整方法,即折线法和对称圆曲线法。通过比较得出:横向贯通误差较大时,适合采用对称圆曲线法予以调整;误差较小时,适合采用折线法予以调整。本隧道采用对称圆曲线法取得了良好的效果。

Tunnel breakthrough error mainly depends on the size of lateral breakthrough error,which is the guarantee of tunnel construction quality.＂Specification for the engineering survey＂ has made the corresponding limit for tunnel lateral breakthrough error with different lengths,which stipulates that the conventional methods are applied when the error is in the allowable range,while the reasonable adjustment methods are employed when the allowable range is exceeded.Taking the lateral breakthrough tunnel as an example,this paper measured the breakthrough error,and designed two kinds of error adjustment methods according to the size of the error,which are polygon method and symmetrical circular curve method.The two methods comparison concluded that the symmetric circular curve method is better when lateral breakthrough error is larger,while the polygon method is used when the error is small.In this paper,symmetric circular curve method was adopted and achieved good results,which will provide a reference for the similar tunnels project.