节理岩质边坡长短相间锚杆支护系统分析

首先,分析了该公路边坡的地质情况,并对节理岩质边坡的失稳机制进行阐述;然后,通过数值方法,建立正交试验模型,确定了锚杆支护系统的优化方案为:锚杆相间布置,长度分别为6 m、2 m,倾角均为20°,并将得到的结果与普通等长锚杆进行对比。最后,通过数值软件计算边坡加固后的安全系数为1.29,处于稳定状态,岩体的位移场变得均匀和连续,节理面处的较大位移受到抑制,边坡的整体性得到提高,有利于边坡的稳定性。

Analysis for long-short bolt reinforcement system in rock jointed slope

Firstly,the geological situation of the road slope is analyzed.The instability mechanism of rock joint slope is introduced.Secondly,numerical calculation models are founded to do the orthogonal experiments. By the analysis for the orthogonal experiments,the optimum scheme of bolt parameters is conformed.The optimum scheme contains long and short bolt,with length of two meters and six meters separately,inclination angle of 20 degree.At last,the plasto-elastic analysis is done for the slope with reinforcement.The result indicates that safety factor of slope with reinforcement is 1.29,so the slope is in the safety state.At the same time,the displacement field becomes more uniform and continuous,the large displacement near the joint plane is restrained,the integrity of slope is enhanced,and the stability of slope is improved.