## 1 Introduction  
The gob-side roadway in an isolated island working face is a typical representative of a strong mining roadway [1], whose surrounding rock control problem is one of the major technical challenges that restricts underground coal mines. As the mine service cycle extends and mining conditions deteriorate, these kind of roadways are faced with a more complex and difficult supporting surrounding [2, 3]. As a result, the roadway suffers severe shrinkage and deformation, along with increased maintenance costs and frequent repair work, which exerts a serious impact on the normal production of the mine. Many scholars have conducted a host of studies on supporting problems of isolated island working faces or gob-side roadways. Research on isolated island working faces mainly focuses on the roof movement structure, as well as the stress evolution and distribution characteristics of surrounding rock. [PERSON] et al. [4] divided the overlying strata spatial structure into three types, which are \"OX\" type, \"F\" type, and \"T\" type, according to the different boundary states of overlying strata on working surfaces. They also studied the evolution characteristics of \"OX-F-T\" type, that is, the \"OX\" type structure formed by roof \"O-X\" type fracture is the basic form of overlying strata. At this time, in the boundary condition of adjacent working faces, the \"OX\" type structure on one side forms the \"F\" type overlying strata structure, and the \"OX\" type structure on both sides forms the \"T\" type overlying strata structure [4]. [PERSON] et al. put forward the calculation formula of abutment pressure and an instability analysis method of coal body in the isolated island working face. It was concluded that the stress reaches the maximum when the lateral goal of the isolated island working face changes from suspended roof to semi-suspended roof structure, while the stress decreases when the goal width becomes large enough (entering the full mining stage) [5]. [PERSON] et al. reported that the working face was an asymmetric \"T\" type isolated island overburden structure on the vertical section, whose long arm side was prone to large-scale breaking movement of key strata, making it more likely to induce strong mine earthquakes and rock bursts. On the horizontal level, the inferior key strata broke to form an \"O\" type fracture structure, while the thick main critical strata broke in a large scale \"OX\" mode. The gradual breaking and movement of key strata at all levels were main power source of mine earthquake activities [6]. [PERSON] et al. studied the maximum peak value of advanced abutment pressure of gob-side roadway driving in isolated island working face, finding that it was significantly higher than that in conventional working face, and the stress concentration coefficient was 1.84 times that in conventional working face [7]. With a determined width of coal pillar, research on the supporting problem of gob-side roadways has mainly focused on the time-space relationship of mining, the determination of support parameters, and pressure relief technologies. In terms of mining time and space, [PERSON] et al. reported that the middle part of the roof was the key point of support in gob-side roadway driving with small coal pillar facing mining, and put forward three key technologies to improve supporting efficiency, as follows: setting a reasonable coal pillar width; stopping driving in dynamic pressure-affected areas under face mining and restart driving at the end of influence; providing dynamic support in stages [8]. [PERSON] et al. studied the reasonable space-time relationship between gob-side roadway driving and mining face, finding the following: when driving is conducted, the reasonable delay distance of roadway is 136 m and the delay days should not be less than 36 days; when driving and mining are in opposite directions, the distance between the roadway and the stop line should be less than 50 m [9]. In terms of the determination of support parameters, [PERSON] et al.