基于DDARF的节理岩体破坏和锚固效应  

Failure and Anchoring Mechanism of Jointed Rock Mass Using DDARF

作　　者：郑春梅[1] 王明斌[1] 雍敏[2] 蔚立元[3] 张磊[2] 

机构地区：[1]鲁东大学土木工程学院,山东烟台264025 [2]山东大学岩土与结构工程研究中心,山东济南250061 [3]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《土木工程与管理学报》2016年第4期35-40,共6页Journal of Civil Engineering and Management

基　　金：国家自然科学基金(51478213;51579239);山东省自然科学基金(ZR2011EL049;ZR2012EEM010);山东省高校科技计划项目(J15LG01);鲁东大学人才引进科研基金资助项目(LY2011012)

摘　　要：采用DDARF方法模拟双裂隙试件在单轴和双轴压缩条件下的裂纹扩展过程,研究裂隙间距、裂隙角度、裂隙错距和侧向应力对岩块特性的影响,研究表明,试块的峰值强度随着裂隙间距和裂隙错距增加均呈现"W"型变化,随着角度增加呈现"V"型变化,并且随侧向压力的增加,峰值强度和起裂应力均比单轴压缩时提高。对单节理锚固试件进行单轴压缩模拟试验,得到了4种不同锚固角度试块的裂隙扩展规律,研究发现,锚固角度并不是越大越好,存在一个最优锚固角度。对某水电站坝址高边坡进行稳定性分析,加锚后坡脚虽然萌生新裂隙,但是加锚后裂隙扩展的规模和范围受到限制,裂隙并没有扩展到坡体内,无法与深部裂缝贯通,也就不能形成滑动面,从而提高边坡的稳定性并减小边坡的变形。数值模拟结果与相似材料模型试验结果吻合,表明DDARF方法能有效地模拟岩体裂隙扩展过程以及锚杆锚固作用。Using DDARF method, the crack propagation process of double-fractured rock mass was simulated under uniaxial and biaxial compression. The influences of fracture space, fracture angle, fracture relative distance and lateral pressure on rock properties were studied. The peak strength of rock mass shows ＂W＂ type change with the increase of fracture space and relative distance, it presents ＂V＂ type change with the increase of fracture angle. And with the increase of lateral pressure, the peak strength and initiation stress of rock mass improve than uniaxial compression. By the uniaxial compression simulation test of single joint anchored specimen, the crack propagation for four kinds of specimens with different anchor angles are obtained. It~ essential to choose an optimal anchor angles. The high slope＇ s stability of a hydropower station was analyzed. After reinforcement, while new cracks initiate at the foot of slope, the crack propagation is limited in size and scope. It can not form the sliding surface, because crack does not extend to intersect with the deep fractures of the slope. It can enhance the stability of the slope. Numerical simulation is consistent with similar material model test. It is indicated that DDARF can simulate crack propagation process as well as anchor role effectively.

关 键 词：DDARF 节理岩体 裂纹扩展 锚固效应 水电站边坡 

分 类 号：TU452[建筑科学—岩土工程]