Analysis on the main structural factors controlling rockfalls in downtown of Ansai, Shaanxi Province

• Published in: Zhongguo dizhi zaihai yu fangzhi xuebao Vol. 33; no. 3; pp. 51 - 60
• Main Authors: Hu WANG, Huaijun GUO, Yimin WANG, Qiang XUE, Kai WANG, Xianfeng ZHA, Xiaoyong WANG, Pingping SUN, Xiujuan CHENG
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of The Chinese Journal of Geological Hazard and Control 01-06-2022
• Subjects: bedrock joints; geological disaster; loess plateau; rock collapse; structural control planes
• ISSN: 1003-8035
• DOI: 10.16031/j.cnki.issn.1003-8035.2022.03-06

An anticlinal structure with an axis plane along Yanhe river and a strike of about 330° is developed in the bedrock strata within the main urban area of AnSai County. In the bedrock strata, there are generally two groups of tensile joints parallel to the fold axis plane (320°-340°) and vertical (40°-60°), and two groups of conjugate shear joints diagonally intersecting the fold axis. The first group of conjugate shear joint planes struck direction near N-S (0°-10°) and near E-W (80°-90°), while the second group of conjugate shear joint planes strikes direction 100°-120° and 200°-210°. The multiple groups of joints with different strike directions developed in the bedrock have a strong control effect on the development of the collapse structure control plane with the same strike distribution in the study area. In the first group of conjugate shear joints, the near E-W (80°-90°) distributed joint planes control strongly the most developed collapse structure control planes in the study area, and it has the highe