滇中引水工程香炉山隧道软弱夹层锚固效应试验分析

为研究滇中引水工程香炉山隧道复杂岩体软弱夹层的锚固力学效应,利用水泥砂浆试件作为类岩石相似材料,以石膏作为夹层材料,考虑锚杆倾角、直径、长度等因素进行不同夹层倾角情况下的单轴压缩试验,研究了含软弱夹层的复杂岩体的锚固力学效应。结果表明,不同倾角夹层的试件在单轴抗压强度试验中有着不同的破坏形式和锚固强化效果,最优锚固角为与夹层面法线倾角0°~30°,最优锚固长度为6mm和直径为2.8mm,当达到最佳支护范围时试料将出现极为规则的龟裂现象可作为锚固最优的判定方式。

Test Analysis of Anchoring Effect of Weak Interlayer in Xianglushan Tunnel

In order to study the anchoring mechanical effect of the weak interlayer with complex rock mass in Xianglushan Tunnel of Dianzhong water diversion project, the cement mortar specimen is used as the rock-like similar material, and the gypsum is used as the interlayer material. Considering the dip angle, diameter and length of the bolt, the uniaxial compression test is used to study the anchoring mechanical effects of complex rock masses with weak interlayer. The results show that the specimens with different dip sandwiches have different failure modes and anchoring strengthening effects in the uniaxial compressive strength test. The optimal anchoring angle is in the range of 0° and 30° with the normal angle of the interlayer, and the optimal anchoring length and the diameter are 6 mm and 2.8 mm, respectively. When the optimal support range is reached, the test specimen will have extremely regular cracking phenomenon, which can be taken as the optimal way of anchoring.