岩体结构面锚固剪切特性的数值分析  

Numerical analysis for the shear characteristic of structure plane reinforced by rock bolt in rock mass

作　　者：王中文[1,2] 方建勤[2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]广东省长大公路工程有限公司,广东广州510620

出　　处：《煤炭学报》2010年第5期729-733,共5页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50579088)

摘　　要：为了探讨锚杆加固情况下,岩体结构面的力学和变形特征,利用数值分析方法建立结构面直剪三维计算模型,分别改变结构面的表面形态和锚杆倾角,分析其对于结构面强度和变形特征的影响,结果表明:结构面加锚后,剪切强度得到提高,并且等效黏结力的提高幅度较大;结构面起伏角为0时,锚杆倾角为15°对应的剪切强度最大;随着锚杆倾角的增大,试样的剪切强度逐渐减小;结构面起伏角为17°时,剪切强度最大值均出现在锚杆倾角为30～50°的范围内。In order to study the mechanical and deformation characteristic of structure plane in rock mass,under the situation of reinforcing by bolt,the numerical analysis method was adopted. The three dimensional calculation model was founded for simulation the direct shear test of structure plane. The structure plane surface situation and bolt inclination were changed to study their effect to the strength and deformation characteristic of structure plane. The analysis results show that after reinforced by bolt,the shear strength of structure plane is improved,and the equivalent cohesion has the larger degree of improvement,and when the undulating angle of structure plane is 0,it will get its maximum shear strength when bolt angle is 15°,and then with the increase of bolt angle,the shear strength of structure plane reduces gradually,and when the undulating angle of structure plane is 17°,the shear strength of structure plane exist for the bolt angle in the range of 30 ～50°.

关 键 词：岩体 结构面 剪切强度 锚杆 

分 类 号：TU457[建筑科学—岩土工程]