大倾角松软厚煤层综放工作面运输巷围岩应力环境复杂，顶板易冒落，支护困难，影响矿井安全生产。研究大倾角松软厚煤层综放工作面运输巷支护技术，对丰富复杂条件下回采巷道支护技术具有重要意义。 本文针对长山子煤矿1123综放工作面运输巷，通过现场调研、模拟研究、理论分析和现场监测相结合的研究方法，对大倾角松软厚煤层综放工作面运输巷围岩进行了较为系统地研究，结果表明： （1）支护体受载和围岩变形破坏呈非对称性特征。巷道以顶板失稳为特点，失稳形式分为两种，一种为从下帮侧拱角处诱发的围岩失稳，围岩首先从下帮侧拱角处发生破坏，破坏方式为：产生裂隙—弯曲—断裂—回转—垮落，顶板垮落过程分为回转垮落和下沉垮落，另一种为顶板离层诱发的顶板失稳，该失稳方式以下沉垮落为特点。 （2）直墙圆弧拱形巷道下帮侧拱角处是“围岩-支护”结构体失稳诱发点，较矩形巷道，其围岩结构最大剪力平均降低46.5%，最大弯矩平均降低56.5%。 （3）巷道顶板浅基点和深基点的离层预警值可由上覆岩层载荷、巷道宽度、围岩弹性模量、锚杆控制范围及锚索特性确定，长山子煤矿1123综放工作面运输巷顶板离层仪浅基点预警值为60mm，深基点预警值为140mm。 （4）采用综掘工艺和以“大、小结构理论”为基础的锚网索+钢筋梯协调支护技术确定支护参数为锚杆间排距800×800mm，锚索间距1200mm，排距为1600mm。。 现场监测表明，锚索受载>锚杆受载，顶板锚杆受载>下帮锚杆受载>上帮锚杆受载，巷道支护参数适合于1123综放工作面运输巷，取得了良好的经济效益。

The surrounding rock of fully-mechanized caving headentry in the steeply dipping soft thick seam has complex stress environment, collapsible top, support difficulties, which affect the mine safety production. It is signifcant that the study of support technology of fully-mechanized caving headentry in the steeply dipping soft thick seam is for enriching support technology of mining entry under complicated conditions. This paper is aimed at the 1123 fully-mechanized caving headentry in Chang Shanzi mine. Through field investigation, simulation study, theoretical analysis and field monitoring methods, the surrounding rock of the fully-mechanized coal headentry in the steeply dipping soft thick seam has been systematically studied. The results showed that: (1) Support loading and surrounding rock deformation and failure show asymmetric features. Entry instability is mainly characterized by roof instability. the form of entry instability have two kinds of types. One kind of instability is that induced rock instability comes from the lower side of the arch corner. Surrounding rock damage occurs from the lower side of the arch corner firstly. Failure mode is: producing fissures - bent - fracture - rotary – collapse. The final collapse process is divided into two phases that turning collapse and sinking collapse. Another instability is roof separation-induced instability, the instability mode is characterized by the following collapse. (2) It is instability induced point of surrounding rock structure at arch corner under the arc arch straight wall entry. Compared with the rectangular entry, the arc arch straight wall entry maximum shear decreases 46.5% on average and maximum bending moment decreases 56.5% on average at asymmetric loading conditions. (3) Separation warning value of shallow basis points in roof is determined by the relationship between it and overburden load, entry width, elastic modulus of surrounding rock, controlling range of the bolts. Separation warning value of deep basis points in roof is determined by the relationship between it and characteristic of anchor. According formulas and engineering background of steeply dipping soft thick seam of 1123 fully-mechanized caving face in Chang Shanzi mine, it is determined that entry roof separation warning value of shallow basis points is 60mm and warning value of deep basis points is 140mm. (4) Using the steeply dipping soft thick seam entry and "big, small structure theory" as the basis for steel ladder reinforced coordination support technology.Supporting parameters are: bolt row spacing 800 × 800mm, anchor spacing 1200mm, anchor row spacing 1600mm. Site monitoring results show that: anchor force is greater than the bolt, bolt stress characteristics for roof is greater than lower side of wall larger than upper side of wall, the entry support parameters is suited to the 1123 fully-mechanized caving headentry, which has achieved good economic results.