Stress and strain analysis of interlayer slip from fractures and minor folds by Terrestrial Laser Scanning data

摘要

Fracture geometry in folded strata is fundamental to stress and strain analysis and outcrop reservoir analogues. The well-exposed Tian'mu anticline, which consists of interlayered micrite limestone and cherty limestone, was studied in order to reveal interlayer slip mechanisms, and stress and strain impacts of derived fractures and minor folds by using Terrestrial Laser Scanning LiDAR data. The minor folds, occurring predominantly within flexible micrite limestone layers, are closely related to interlayer slip and are largely affected by the lithology. The secondary structures were probably formed at different times during past folding processes. It is necessary to separate different joint sets and secondary folds, and to then judge their ages separately. This results in implications for joint research. More importantly, it is necessary to consider the overall strain of the primary fold, or a larger area when researching the strain variations.