变角度空间块体滑落模型试验及其稳定性分析

工程岩体被不同产状类型的结构面切割,在空间上形成嵌固的块体。在边坡和隧道开挖过程中,由于受到工程扰动,某些块体将失去原有的静力平衡状态,成为关键块体,并沿着结构面滑移,导致局部塌落,进而产生连锁反应,造成一定范围内岩体的局部失稳。针对关键块体在不同角度的滑落及稳定性问题,本试验利用东北大学自行研制的变角度空间块体滑落试验平台,通过制备楔体实物模型,分别选取大理岩和水泥砂浆块体,模拟块体与结构面的相互关系,并研究滑落规律和范围,通过极限平衡法计算块体的稳定性。试验结果表明,块体滑落的倾斜角与试验模型旋转角之间有一定的联系,块体滑落的角度和理论计算的安全系数基本相符。

Block Slide Model Test on Variable Angle Space and Block Stability Analysis

Engineering rock mass is cut by structure surfaces of different occurrence,so blocks embedded each other are formed in space.In the process of side slope and tunnel excavation,some blocks will lose the static equilibrium state and become key blocks because of the engineering disturbance,then slide along the structure surface and lead to local collapse.As a result of a chain reaction,it causes a certain range of rock mass instability.Aiming at the slide and stability problem of key block in different angle,this paper uses the angle change space block slide test platform developed by northeastern university and chooses blocks of marble and cement plaster by making physical models and models the relationship between blocks and structure surfaces,its slide rule and scope is studied as well.Stability of the block is calculated through the limit equilibrium method.The result shows that the incline angle of sliding blocks has a certain relation with the rotation angle of the experimental model,and it conforms to the result of safety factor calculated according to theoretical calculation basically.