A case study on control technology of surrounding rock of a large section chamber under a 1200-m deep goaf in Xingdong coal mine, China. (October 2019)

• Record Type: Journal Article
• Authors: Xie, Shengrong; Pan, Hao; Zeng, Junchao; Wang, En; Chen, Dongdong; Zhang, Tao; Peng, Xuejiao; Yang, Junhui; Chen, Feng; Qiao, Shunxing
• Is Part Of: Engineering failure analysis. Volume 104(2019)
• Page Start: 112
• Page End: 125
• Publication Date: 2019-10
• Subjects: Under the goaf -- Large section -- Plastic zone -- Thick reinforced concrete wall; 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.2019.05.039
• Languages: English
• ISSNs: 1350-6307

Abstract

Abstract: The drainage system chamber with a net section of 68.3 m2 requires excavation under a 1200-m deep goaf, which is determined by geological conditions of production containing the mining layout and excavation system, hydrogeology, and actual water gushing at −980 mining level dip area of Xingdong coal mine. The chamber and its surrounding rock influence area are arranged in the large-range stress-released zone of the floor of 2127 goaf to effectively improve the basic stress environment of the chamber's surrounding rock and to eliminate or weaken the influence of deep high stress and rock mass rheological properties on the continuous large deformation of the surrounding rock. However, the surrounding rock of the chamber is completely in the plastic zone. Thus, it will remain subject to more severe support problems. In view of the control problem of the surrounding rock of the large section chamber under the 1200-m deep goaf, this paper proposes a comprehensive control technology using the strong anchor bolt (cable) support, pouring of thick reinforced concrete wall, and full section pressure-regulating grouting behind the wall. It also clarifies the supporting mechanism on the basis of the pressure relief of the chamber's surrounding rock. Engineering practice shows that the large section chamber has not been renovated, and the maximum deformation of the surrounding rock is only 50 mm in over four years since the completion of construction. Thus, this technology has achieved a long-term effective control with no refurbishment after supporting the large section chamber under the 1200-m deep goaf. Furthermore, it enriches the control theory and technology for the surrounding rock of deep roadways. Highlights: Reasonable location of pump house is determined in the 1200-m deep mine. Support problems of the large section chamber under the 1200-m deep goaf are analyzed. A special comprehensive surrounding rock control technology is presented.