摘要
基于主动支护方式的思想,从提高弱面本身抗剪性能的观点出发,对顺层岩质边坡采用了弱面注浆加固的治理方法。通过对比试验,分析了岩块试样在注浆前后抗剪性能的变化,结果表明注浆后,弱面峰值前平均剪切刚度Kss和粘结力c有较大的提高,而摩擦角的提高幅度较小。针对边坡坡角α大于弱面倾角β的情况,在假设不稳定岩体沿弱面滑动的基础上,推导了滑坡的临界长度,从而确定有效注浆范围。最后,由FLAC3D数值模拟,分析注浆前后整个边坡应力场的变化,说明注浆加固能够使应力在边坡岩体中得到均化,避免应力集中现象的发生。
Based on the idea of initiative reinforcement, and from the viewpoint of improving weak surface＇s selfshearing resistance properties, the treatment of weak surface grouting reinforcement for rock-bedded slope is adopted. Through the contrast tests, the changes of the shearing resistance properties of rock mass before and after grouting are analyzed, the testing results show that after grouting the average shear stiffness Kss^- of weak surface in pre-peak stage of shear resistance strength curves and the cohesion value c of the weak surface are highly increased, and the value of friction angle Ф is slightly increased. Based on the hypothesis of slipping along weak surface for unstable rock mass, the critical length of the slip stratum is theoretically analyzed when the circumstance of slope angle α is greater than the weak surface angle β in rock-bedded slope, and the effective grouting range for the slope is obtained. Through the numerical simulation by FLAC3D, the changes of stress distribution in the whole slope before and after grouting are analyzed, which shows that grouting in the effective grouting area can properly make the stress distribution in slope rock mass more homogenized, and the phenomenon of stress concentration can be avoided.
出处
《工程勘察》
CSCD
北大核心
2007年第6期27-30,37,共5页
Geotechnical Investigation & Surveying
