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Gob-side entry retaining in fully mechanized caving is a crucial technology for resolving gas accumulation and overstressing issues on working faces in high-yield and highefficiency fully mechanized caving by the Yshaped ventilation method. This method is advantageous because it eliminates panel coal pillars, improves the resource recovery ratio, reduces roadway development work, alleviates alternation problems during excavation, and eliminates isolated working faces (Zhang and Lin, 2014; Wang, Zhang, and Wang, 2015; Wang, Zhang, and Gao, 2015; Zhang et al., 2015). In recent years, numerous researchers have conducted extensive studies on gob-side entry retaining technology for fully mechanized caving faces from various aspects, including theoretical investigations (Ma et al., 2007; Wang et al., 2001), simulations (Zhang et al., 2016a), and field operations (Ma and Zhang, 2004; Li., 2005). Deng and Wang, (2014) analysed the feasibility of gob-side entry retaining in steep coal seam mining using numerical modelling. Zhang et al. (2014) explored the deformation and failure characteristics as well as control mechanisms of the roof in gob-side entry retaining of a steep thin coal seam. Tan et al. (2015) analysed the roadside support body of gobside entry retaining under the condition of hard roof. Zhang et al. (2015) analysed the application of high-water packing materials in gob-side entry retaining in a high-gas mine using numerical analysis. Yang et al. (2016) studied the soft roof failure mechanism and supporting method for a gateway in gob-side entry retaining. Yang et al. (2015) evaluated the effect of six geological factors on the design of a gob-side entry retaining structure. Han et al. (2015) combined theoretical and numerical methods to explore the stress relief and structure stability mechanism of a gobside entry retaining structure under the condition of hard roof. Li et al. (2016) investigated the fracture position of the key rock block and crack evolution processes using a gob-side filling wall by numerical modelling. These studies provided a solid theoretical foundation and technical guidance for the implementation and promotion of gob-side entry retaining technology for fully mechanized caving faces. However, due to constraints such as the testing equipment, design, and cost, only limited studies on gobside entry retaining technology for fully mechanized caving faces using similar material test methods have been conducted (Xu and Wang., 2015). Experimental study on the stability of surrounding soft rocks of gob-side entry retaining in fully mechanized caving