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对现阶段煤巷支护现状,尤其是对让压支护理论及技术进行了总结分析。对“先控后让再抗”支护理念的必要性和工程意义进行了研究。以该理念为指导,针对深部高地应力煤巷支护需要,研制了高强让压型锚索箱梁支护系统,分析了系统的高强让压性能,研究了箱型支护梁及锚索让压环等组成构件的功能和力学特性。通过与槽钢、工字钢的对比分析结果可知箱型支护梁强度高、刚度大、护表效果好、传力性能佳、经济性高;单轴压缩试验结果表明该锚索让压环具有独特的二阶式让压性能,且让压点较高、让压距离大、让压稳定性好。该支护系统组合方式多样、适用范围广。根据赵楼煤矿3320运输平巷地质情况设计了高强让压型锚索箱梁支护系统相应方案,并与原支护方案进行了数值模拟对比,结果显示该方案明显优于原支护方案。新型支护方案用在平巷的试验段中,达到了良好的支护效果。
The current situation of coal roadway support, especially for the pressure support theory and technology were analyzed. The necessity and engineering significance of the idea of “supporting and protecting” after “controlling first” are studied. Under the guidance of this concept, in view of the need of deep high ground stress coal roadway support, a high-strength support system for pressure-type anchor box girder was developed, the high-pressure let-down performance of the system was analyzed, Pressure ring and other components of the functional and mechanical properties. Through the comparison with channel steel and I-beam, it can be seen that the box beam has the advantages of high strength, large rigidity, good curse effect, good transmission force performance and high economic efficiency. The uniaxial compression test results show that the anchor cable makes the ring With a unique second-order let pressure performance, and let the pressure point higher, so that pressure distance from the large, so that the pressure stability. The support system combination of diverse ways, a wide range of applications. According to the geological conditions of 3320 transportation laneway in Zhaolou Coal Mine, the corresponding scheme of high strength cable box girder support system is designed and compared with the original support scheme. The results show that the scheme is obviously better than the original support scheme. The new support scheme is used in the test section of the laneway to achieve a good support effect.