The use of rod extensometers is one of the most commonly used monitoring methods for the prediction of yielding zones of underground openings. However, this method requires expensive and long-term measurements. In this study, comprehensive investigations were carried out to determine the performance of the pressuremeter test as for rapid in situ measurement methods to expeditiously estimate the boundary of the yielding zone. An unstable tunnel of the Cokal Dam in Gelibolu County of Canakkale was chosen for investigations. Laboratory tests, drilling, topographic measurements, pressuremeter tests, and rod extensometer measurements were performed in order to assess the instability and to determine the boundaries of the yielding zone. The in situ tests revealed that the boundaries of the weak zone, determined using the pressuremeter tests, was in good agreement with the failure depths determined by the rod extensometer measurements.

杆式引伸计的使用是预测地下洞口屈服区最常用的监测方法之一。但是，这种方法需要昂贵且长期的测量。在这项研究中，进行了全面的调查以确定压力计测试的性能，以作为快速现场测量方法以快速估算屈服区的边界。Canakkale的Gelibolu县的Cokal大坝的不稳定隧道被选作调查对象。为了评估不稳定性并确定屈服区的边界，进行了实验室测试，钻孔，地形测量，压力计测试和杆引伸计测量。原位测试表明，使用压力计测试确定的薄弱区域边界，