Techniques including pre‐grouting, long pipe roof, and parameter optimization were
employed to ensure the safety of loess metro tunnelling under an existing glass building …

The objective of this study is to detect and estimate the size of a cavity beneath a concrete
plate using ground penetrating radar (GPR) and microphone surveys in laboratory tests. A …

Most back analysis methods for geotechnical engineering are based on the measured
displacement. However, before the monitoring sections are assembled, the displacement …

Hollow grouted rock bolts are widely used to reinforce the surrounding rock mass in
underground engineering, such as deep roadway of coal mines, deep tunneling. The …

Abstract Design of an advanced instrument for inspecting rock bolt integrity by means of
ultrasonic guided waves is presented. Issues related to features of multimodal and …

The axial loading in rockbolts changes due to stress redistribution and rheology in the
country rock mass. Such a change may lead to debonding at rockbolt to grout interface or …

Rock quality is a critical design parameter of rock bolts. However, rock weathering
deteriorates rock quality and adversely affects the performance of rock bolts. The objective of …

Soft sandstones are known to deteriorate with increasing water saturation. This study
explores the effects of different immersion heights on the failure characteristics of soft …

The nondestructive testing technique used to evaluate the quality of bolt support by
detecting the axial force is suitable for the bolt with a short construction time. For the bolt in …

Poor anchorage quality of rock bolts is easily caused by inappropriate control of the grouting
process, leakage of grouting due to broken rock, and insufficient length of bolts. Wave …