深部厚顶煤巷道让压型锚索箱梁支护系统布置方式对比研究

针对深部厚顶煤巷道围岩变形特点，以“先控后让再抗”为支护理念，设计了让压型锚索箱梁支护系统横梁、纵向单梁、纵向双梁及纵横组合4种不同布置方式的支护方案。数值试验结果表明，纵横组合方案具有最好的围岩控制效果，横梁方案支护效果相对较差。对让压型锚索箱梁支护系统的4种方案进行了现场试验，监测结果显示，纵横组合方案作用下的围岩变形量最小，其两帮移近量和顶板沉降量仅为120 mm和90 mm，同时该方案支护反力最大；锚杆、锚索受力与巷道围岩控制效果相对应，且锚索让压环作用明显；设计制作的测力箱梁监测表明，箱型支护梁受力合理协调，材料性能发挥充分。对让压型锚索箱梁支护系统及其不同布置方案的作用机制进行了探讨。综合分析表明，深部厚顶煤巷道中，优先选用让压型锚索箱梁支护系统中的纵横组合与纵向单梁方案，可有效地控制巷道围岩变形，满足支护要求。

Comparative study of arrangement mode of pressure relief anchor cable box beam support system in deep thick top coal roadway

According to the deformation characteristic of surrounding rock in deep thick top coal roadway, guided by the support idea of controlling at first, pressure yielding behind and then resistance, four schemes of pressure relief anchor cable box beam support system are designed, of which beam arrangement mode are lateral beam, longitudinal single beam, longitudinal double beams and longitudinal-lateral combined beam respectively. The results of numerical test show that, among the four schemes, longitudinal-lateral combined beam scheme is best in surrounding rock controlling; lateral beam scheme is relatively worst. The four schemes are applied to field test. The monitoring results show that the surrounding rock deformation of test section with longitudinal-lateral combined beam scheme is least; the sides deformation is 120 mm and the roof deformation is 90 mm. Meanwhile, bolts and anchor cables have the largest supporting reaction in this scheme. The force measuring anchor cable box beams are designed and made. The monitoring results show that box beam stress conditions are reasonable and coordinate, material is used fully. In the four schemes, supporting and protecting components reaction corresponding with the effect of the roadway control, and the effect of anchor cable yielding ring is obvious. Mechanisms of support systems are analyzed. Under the geological conditions of deep thick top coal roadway, longitudinal-lateral combined beam and longitudinal single beam schemes of pressure relief anchor cable box beam support system are better for controlling surrouding rock deformation in a cost-effective way; and the supporting demand is satisfied.