摘要
利用拉格朗日差分计算方法建立节理岩体边坡的数值分析模型,分析节理面充填厚度以及锚杆支护参数对边坡稳定性的影响,得到:(1)节理充填物厚度对于边坡稳定性的影响不大。边坡上部岩土体主要发生拉伸破坏,而在节理面上主要发生剪切滑移破坏。(2)边坡的安全系数随锚杆长度的增加而非线性增大。当锚杆长度达到一定值后,边坡的安全系数将不发生变化。当锚杆长度增大时,边坡的塑性破坏区域不断增大,并且塑性区从坡脚处往坡顶发展。(3)边坡安全系数F随锚杆倾角θ的增大呈现先增大后减小的形式。边坡的安全系数F随锚杆间距S的增大而非线性减小。
The Lagrange differential calculation method is used to establish jointed rock mass slope numerical analysis model.The influence of thickness of filling material,reinforcement parameters of anchor bolt to the stability of slope is analyzed.The results show that,(1) the influence of thickness of filling material in joint is very small.There mainly occurs tensile failure at the top part of rock mass of slope,and shear slip failure at the joint plane.(2) the factor of safety increases in the nonlinear form with the increase of bolt length,if the bolt length reaches a certain value,the safety factor of slope will not change.With the increase of bolt length,the plastic failure area of slope will become larger gradually,and the plastic zones expand from the slope toe to the slope top.(3) the safety factor of slope will first increase,then decrease with the increase of bolt inclination.And with the increase of bolt spacing S,the safety factor of slope will decrease nonlinearly.
出处
《建筑科学》
北大核心
2013年第7期11-15,共5页
Building Science
基金
江西省交通科技项目基金资助(2011C0057)
关键词
节理岩体
边坡
安全系数
锚杆加固
jointed rock mass
slope
safety factor
bolt reinforcement
