This book is a compilation of selected papers from the 2021 China-Europe International Conference on Pipelines and Trenchless Technology. The international academic conference is organized to • further promote the cause of trenchless works in China • ensure the quality of engineering construction • introduce advanced technology, equipment, and materials • promote the exchange and learning of trenchless technology • enhance the level of trenchless technology in China • improve the international influence of trenchless academics in China • promote the standardization and localization of trenchless technology in China • and lead the healthy development of the industry. .