加锚岩体流变特性及锚固控制机制分析  

Analysis of rheological properties and control mechanism of anchored rock

作　　者：赵同彬[1,2] 谭云亮[1] 刘姗姗[1] 肖亚勋[3] 

机构地区：[1]山东科技大学资源与环境工程学院,山东青岛266510 [2]煤炭资源与安全开采国家重点实验室(中国矿业大学),北京100083 [3]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《岩土力学》2012年第6期1730-1734,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.51004068);山东省优秀中青年科学家科研奖励基金(No.BS2011NJ014);煤炭资源与安全开采国家重点实验室开放基金项目(No.SKLCRSM10KFB03)

摘　　要：通过室内蠕变试验和理论分析,对加锚改善岩石流变力学特性进行了研究,并探讨了锚固控制岩石流变的力学机制。采用RLJW-2000型流变试验机,对红砂岩及其加锚试件进行分级加载(100 h以上)单轴压缩试验,结果表明,加锚后岩石的流变应力阀值提高了20%～30%c,且不同应力水平流变量均能得到一定控制,加锚使试件的长期强度增加了5%～10%c。此外,基于整体协调变形原理,建立了加锚体流变本构方程,推导出了一维B-K模型解答,算例分析表明,锚杆密度越大,对岩石流变控制效果越好,得出锚杆等效刚度是约束岩石流变的主导因素,但从技术经济角度考虑,锚杆支护密度与岩石流变参数之间存在一个合理的匹配区间。研究结果对长期使用的岩体工程锚固支护设计提供了理论依据。By laboratory test and theoretical analysis,the rheological properties of anchored rock and controlling mechanism by anchor are studied.The results show that,non-anchored and anchored specimens’ indoor long-time（above 100 h） creep test is done by RLJW-2000 rheology tester;creep stress threshold of anchored rock is increased by about 30% c;creep deformations at different stress level stages are significantly controlled;and anchored specimen’s long-term intensity is increased by 5% to 10% c.In addition,according to the equivalent co-deformation principle,one-dimensional creep constitutive equation of anchored rock is established;the answer of anchored generalized Kelvin（B-K） model is derived.The example shows that rock rheology’s control effect gets better with increasing of bolt consistency,which can be obtained that the anchor’s equivalent stiffness is a dominant factor restraining rock rheology.But from the view of economic technology,bolt consistency and rock rheological parameters have a rational matching interval.The result provides a theoretical basis for the anchorage support design of rock engineering after long-term service.

关 键 词：加锚岩石 流变特性 本构模型 锚固机制 

分 类 号：TU45[建筑科学—岩土工程]