Li Pengfei is a Professor and Doctoral Supervisor at the College of Architecture and Civil Engineering, Beijing University of Technology. His research mainly focuses on the stability of surrounding rocks and the mechanical properties of support structures for tunnels in saturated ground. He has presided over 3 NSFC projects and 3 BJNSF projects. His research has investigated the space–time effect of ground displacement, proposed failure modes of tunneling faces, and presented analytical solutions for obtaining ultimate pressure. His work discovered ground reaction curves, analytical solutions for seepage fields using deep tunnels in saturated ground, and the effect of ground reinforcements. He also studied pore-water pressure distribution conditions in composite linings, the quantitative relation between water pressure and seepage discharge, and has provided a design method for acquiring a reasonable grouting circle. He has invented a maintainable proof-drainage system and a bottom water pressure reduction drainage system and developed corresponding model testing installations. His work has also illuminated acting modes and calculation models for surrounding rock pressure for parallel tunnels with a small clear distance and devised a physical testing appliance for twin tunnels. He has published over 70 papers and an academic monograph, obtained over 30 authorized invention patents, and won 7 provincial-level scientific and technological progress awards.