Model test on creep deformation and failure characteristics of soft rock roadways. (November 2022)

• Record Type: Journal Article
• Authors: Zhu, Qingwen; Li, Tingchun; Ran, Jinlin; Du, Yiteng; Zhang, Hao; Jiang, Hua
• Is Part Of: Engineering failure analysis. Volume 141(2022)
• Publication Date: 2022-11
• Subjects: Creep deformation -- Failure characteristics -- Soft rock roadway -- Combined support -- Model test; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2022.106670
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: A study of the time similarity features of IBSCM materials of the surrounding rock. Research on the creep deformation features of a combined support structure. A study of the continuous failure and nonconvergence law of the surrounding rock. Analysis of floor heave features and the supply path of surrounding rock movement. Investigation of the evolution law of the contact force between the lining and arch. Abstract: This paper studies the creep deformation and failure characteristics of a soft rock roadway under the condition of combined support through a model test that lasted for 30 days. Under the action of high stress, the soft rock roadways present a tendency of continuous failure and nonconvergence, and the cross-sectional area shrinks to 52.3 % of the original roadway. The failure of the anchorage zone causes the bolt to lose its supporting function, and the continuous extrusion leads to the cracking of the lining and the shrinkage of the arch. Floor heave is the superposition of geometric deformation and loose deformation. The floor is continuously replenished by the movement of the surrounding rock below and to the two sides and moves upward under the combined action of high-level stress and vertical stress. Finally, the model test conclusion is verified by field tests, and deformation control schemes are proposed.