Gob-side entry retained with roadside filling (GER-RF) plays a key role in achieving coal mining without pillar and improving the coal resource recovery rate. Since there are few reports on the cyclic filling length of GER-RF, a method based on the stress difference method is proposed to determine the cyclic filling length of GER-RF. Firstly, a stability analysis mechanics model of the immediate roof above the roadside filling area was established, and then, the relationship between the roof stress distribution and the unsupported roof length was obtained by the stress difference method. According to the roof stability above the roadside filling area based on the relationship between the roof stress and its tensile strength, the maximum unsupported roof length and rational cyclic filling length were determined. Combined with the geological conditions of the 1103 thin coal seam working face of Heilong Coal Mine and the 1301 thick coal seam working face of Licun Coal Mine, the suggested method was applied to determine that the rational cyclic filling lengths were 2.4 m and 3.2 m, respectively. Field trial tests show that the suggested method can effectively control the surrounding rock deformation along with rational road-in support and roadside support and improve the filling and construction speed.

中文翻译：

---

路边填土留沿沿空巷道循环填土长度的确定及其应用

留沿沿空留巷（GER-RF）对实现无柱采煤、提高煤炭资源回收率具有关键作用。针对GER-RF循环填充长度的报道较少，提出一种基于应力差法确定GER-RF循环填充长度的方法。首先建立了路边填土区上方直接屋盖的稳定性分析力学模型，然后通过应力差法得到屋盖应力分布与无支撑屋盖长度的关系。根据路侧填土区上方顶板的稳定性，根据顶板应力与其抗拉强度的关系，确定最大无支撑顶板长度和合理循环充填长度。结合黑龙煤矿1103薄煤层工作面和李村煤矿1301厚煤层工作面地质条件，采用建议方法确定合理的循环充填长度为2.4 m和3.2 m，分别。现场试验表明，该方法能有效控制围岩变形，合理的入路支护和路边支护，提高填筑和施工速度。