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为提高层理地质条件下大变形巷道的稳定性,延长巷道使用寿命,采用具有较大变形承载能力的喷钢纤维混凝土与弹性锚杆耦合支护技术加固围岩。首先研究层理状地质条件下高应力软岩巷道的破坏特点及规律,确立支护结构和时效耦合的关系,并通过钢纤维混凝土试样的动静荷载试验,研究混凝土强度与钢纤维掺量的关系,得到喷钢纤维混凝土合理的钢纤维掺量。此外,针对大变形巷道开挖初期变形量大、破坏速度快的特点,设计具有让压吸能作用的新型弹性锚杆,并将此弹性锚杆结合喷钢纤维混凝土技术进行工业试验,试验的位移监测结果表明:该方案位移量比原方案减小约50%,且支护10个月后未出现裂缝。
In order to improve the stability of the large deformation roadway under the bedding geological conditions and prolong the service life of the roadway, the surrounding rock is reinforced by the steel-fiber reinforced concrete with large deformation load capacity and the elastic bolting support technology. Firstly, the failure characteristics and laws of high-stress soft rock roadway under stratified geological conditions are studied, and the relationship between supporting structure and time-dependent coupling is established. Through the static and dynamic load test of steel fiber reinforced concrete specimen, the relationship between concrete strength and steel fiber content Relationship, get steel fiber reinforced steel fiber reinforced concrete fiber content. In addition, aiming at the large amount of deformation and fast destroying speed in large deformation tunnel, a new type of elastic anchor rod with pressure-absorbing effect was designed and the industrial test was carried out with the combination of this elastic anchor bolt and steel fiber reinforced concrete technique Displacement monitoring results show that the displacement of the scheme is reduced by about 50% compared with the original scheme and no cracks occur after 10 months of support.