破裂岩石加固后力学性质试验研究

EXPERIMENTAL INVESTIGATION ON MECHANICAL PROPERTY OF REINFORCED FRACTURED ROCK

地下工程开挖过程中,经常会遇到破裂结构岩石,而且完整岩石在高应力或其他因素作用下也会发生破裂。破裂岩石往往具有岩块强度较高、岩体强度较低的特点,但破裂岩石经过有效加固后能够保持较高承载能力。应用室内模拟方法,对完整岩块以及采取注浆胶结、锚杆–注浆胶结联合加固2种方法加固后的破裂岩石力学性能进行试验研究,获得破裂岩石加固后的强度恢复信息。试验结果表明,注浆胶结加固后的破裂岩石试样抗压强度可以恢复到完整岩石试样的40%～50%,无残余强度;锚杆–注浆胶结联合加固的破裂岩石试样抗压强度恢复率略大于胶结岩石试样,残余强度明显提高。

Fractured rock is often encountered in the process of underground construction,and intact rock can also be broken under the condition of high stress or other factors.The fractured rock has the properties of high rock strength but low rock mass strength,and it can keep high bearing capacity after being effectively reinforced.The mechanical characteristics of intact rock and fractured rock reinforced by grouting and bolt-grouting,respectively,were studied in laboratory.And the information about strength recovery of reinforced fractured rock was gained.The experimental results show that the compressive strength of the grouting reinforced fractured rock sample can recover to 40%–50% of the intact rock,and has no residual strength.The compressive strength recovery rate of bolt-grouting reinforced fractured rock sample is a little larger than that of the grouting reinforced fractured rock sample,and the residual strength is obviously improved.