Abstract: With the continuous increase of mining depth in a copper mine，high ground stress induc‐ es large deformation of surrounding rock of soft rock roadway，which seriously threatens the safe produc‐ tion of the mine. In order to reveal the deformation mechanism of soft rock roadway and determine the opti‐ mal support time，the monitoring system of roadway ground pressure is constructed，and the long-term monitoring test of stress and deformation of underground surrounding rock is carried out. The results show that the horizontal stress variation of the roadway is significantly greater than the vertical stress，and the maximum stress variation of the surrounding rock of the left side is 20.16 MPa. The displacement of the two sides and the roof of the roadway is mainly concentrated in the first 21 days of monitoring，and the maxi‐ mum deformation is 62.2 mm. The horizontal displacement changes rapidly and then tends to be stable. Based on the analysis of the causes of roadway failure and prevention and control measures，FLAC finite difference software is used to carry out numerical simulation of support. The results showed that when the support was implemented on the 10 th day of monitoring，the maximum horizontal stress of the roadway is 47.5 MPa and the maximum vertical stress is 32 MPa. The maximum deformation of surrounding rock is 19% and 28.67% lower than that of the 5 th day and the 15 th day respectively. The field application veri‐ fies that the deformation of roadway roof and two sides under the optimized support scheme is reduced by 20.8% and 17.3% respectively compared with the original scheme，and the stability of roadway is effective‐ ly controlled. The research results can provide theoretical basis and technical guidance for deep soft rock roadway support design and ground pressure disaster prevention and control.

Key words: deep mining, soft rock roadway, ground pressure monitoring, numerical simulation