单向逐级加载劣化诱导三圆孔模型的力学响应
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湖南省自然科学株洲 联合基金资助项目(2022JJ50087)


Mechanical Response of a Mortar Plate Model with Three Circular Holes Under a Unidirectional Progressive Loading Degradation Induction
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    摘要:

    由于施工扰动会导致洞室群的围岩劣化,对洞室群失稳产生诱导效应。为模拟洞室拉破坏和剪破坏两种典型的破坏特征,分别设计了水平和对角倾斜间隔三圆孔平板水泥砂浆模型,分别为洞室间隔矩形空孔、石蜡填充空孔和石膏填充空孔,模拟围岩由强到弱损伤的诱导效应,并定义其劣化指标。利用数字散斑系统MatchID-2D研究单轴逐级加卸载循环下无填充、石蜡填充和石膏填充空孔条件下的变形破坏特征,发现诱导程度越强,模型破坏荷载越小;同样,诱导条件下对角倾斜间隔三圆孔较平孔的破坏荷载小,平孔模型以拉破坏为主,斜孔模型以剪破坏为主。利用FLAC3D数值模拟软件进行加卸载试验,对洞室周围进行变形监测与MatchID-2D的引伸计功能进行对比,分析诱导对通过平孔模型的圆孔中心和诱导平孔中部竖直方向收敛的影响规律,发现平孔诱导空孔填充材料能明显降低中间圆孔和诱导平孔收敛,斜孔模型中间圆孔收敛呈类似特征。

    Abstract:

    Due to the fact that the construction disturbance leads to the deterioration of the surrounding rock of the cavern group, which will produce an inductive effect on the instability of the cavern group, and in view of a simulation of the two typical failure characteristics of tension failure and shear failure of caverns, a horizontal and diagonal inclined flat cement mortar model has thus been designed with three circular holes, with the inductive effect simulated for surrounding rocks under strong to weak damages, thus defining its deterioration index for the rectangular hollow holes for cavern spacing, paraffin filled hollow holes and the gypsum filled hollow holes. By using the digital speckle system MatchID-2D, a study is conducted on the deformation and failure characteristics of the model under uniaxial stepwise loading and unloading cycles under the conditions of unfilled, paraffin filled, and gypsum filled voids. It is found that the stronger the degree of induction, the smaller the model failure load will be. Similarly, under induced conditions, the failure load of diagonally inclined spaced three circular holes is smaller than that of flat holes, with the flat hole model mainly focusing on tensile failure, while the oblique hole model mainly focusing on shear failure. Using FLAC3D numerical simulation software for loading and unloading tests, a comparison can be made of the deformation monitoring around the cavern with the extensometer function of MatchID-2D, followed by an analysis of the influence of induction on the vertical convergence of the center of the circular hole passing through the flat hole model and the middle of the induced flat hole. It is found that the flat hole induced empty hole filling material can significantly reduce the convergence of the middle circular holes and the induced flat holes, with a similarity of characteristics in the convergence of the circular holes in the middle of the oblique hole model.

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陈一帆,祝方才,周俊杰.单向逐级加载劣化诱导三圆孔模型的力学响应[J].湖南工业大学学报,2024,38(1):21-31.

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  • 收稿日期:2023-01-13
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  • 在线发布日期: 2024-01-07
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