This work studies the impact of estimating soil wave number in Underground Focused SAR imaging for tunnel detection applications. It is demonstrated that neglecting wave refraction at the ground surface results in poor underground imaging; however, by considering refraction with inexact, yet sufficiently high, estimates of soil dielectric constant, clear target images can be produced. In additi...

Due to the complexity of underground environmental conditions and operational incidents, advanced accurate monitoring metro shield tunnel structures is crucial for maintenance prevention mishaps. In past few decades, numerous deep learning-based damage identification studies have been conducted on aboveground civil infrastructure. However, a tunnels. This paper presents study Based previous exp...

In the process of urban rail transit construction, underground excavation method is often used in subway station construction. Based on a large number measured data Qingdao Metro Line 3, this paper analyzes and studies ground subsidence law long-span shallow buried station. The research results show that vertical surface settlement will be caused by both sides guide hole, but relatively small, ...

Synthetic Aperture Radar (SAR) interferometry is a formidable technique to monitor surface deformation with millimeter detection resolution. This study applies the Persistent Scatter-Interferometric (PSInSARTM) measure ground subsidence related twin-tunnel excavation in downtown Los Angeles, USA. The PSInSARTM suitable for urban settings because areas have strong reflectors. twin tunnels Angele...

Durability problem of reinforced concrete for underground structures is a hot issue in the field of structural engineering. For underground structures, the prediction of structural service life and methodology for durability design are needed to estimate structural durability. Taking the case of Xiamen Xiang’an subsea tunnel as background, which is designed to meet the requirement of 100-year s...

This paper proposes a novel personnel positioning scheme for a tunnel network with blind areas, which compared with most existing schemes offers both low-cost and high-precision. Based on the data models of tunnel networks, measurement networks and mobile miners, the global positioning method is divided into four steps: (1) calculate the real time personnel location in local areas using a locat...