Liu Liu – författare

This book focuses on research into near-field microseismic monitoring technology for deep-buried engineering. It proposes a series of innovative methods for microseismic data analysis, including signal identification, P/S arrival picking, coda wave-based event cluster localization, localization of heterogeneous microseismic events, surrounding rock stability analysis of cross tunnel, and double-difference dynamic tomography. The book serves as a reference for researchers in the field of microseismic monitoring and provides technical support for rockburst early warning in deep-buried engineering. Its main features and benefits include:(1) The proposed methods exhibit stronger adaptability to complex environments.(2) The series of analytical methods consider the interconnections between microseismic events, better reflecting the collective characteristics of microseismic activity.(3) The series of methods proposed in this book fully account for the heterogeneity of the surrounding rock.

Karst voids at pile locations can have a significant negative impact on the bearing capacity and overall safety of cast-in-place pile foundations. This book introduces a state-of-the-art detection system, comprising of specialized equipment, algorithms, and software, designed to identify karst voids during deep cast-in-place pile foundation construction. The system includes a unique multifrequency borehole sonic probe, a single borehole radar, two pile hole sonar probes, and a corresponding signal analysis method. Several field and synthetic tests have been conducted to detect karst voids during cast-in-place pile foundation construction, and the results demonstrate that this technology can offer detailed geological information for pile design and ensure the safety of foundation construction. The work presented in this book has received the First Prize for Technological Invention in Shanghai, China in 2022.