CHANTHAVONGXAY THANONGDETH Study on pipe line behavior and Earth Pressure acting on pipe during construction by site measurement. Pipe jacking method is a technique for installing underground pipelines. Powerful hydraulic jacks are used to push pipes into the ground behind a TBM, at the same time excavation is taking place ahead of the TBM. The main factor influencing on jack force is the friction resistance between pipes and ground, then the excavation radius by TBM is larger than the outer radius of pipes. The over-cutting area between pipes and the ground is a significant factor giving influence to jack force. So far, most of the models estimating jack force do not consider the over-cutting area, and then the pipe behavior is not still clarified well. To overcome the above problems, the new analysis model has been developed by using the full ground spring model that can take over-cutting into consideration. This study aims to validate this analysis model by site measurement. As a result of the site measurement, it was confirmed that the compression stress is concentrated on crow and invert part of pipe that is generated by the cushion material in 90 degree range at upper and lower parts of the pipes. However, along the center of the curve, the increment of compression stress is confirmed at the inward of the curve, and the decrement of compression stress appears at the outward curve. Comparing the pipe position and the trace of the TBM, it was found that the pipe passed the inward of the curve at beginning of curve and end of curve and the outward of the curve at the center of the curve.