露天煤矿软岩边坡泥岩非线性蠕变损伤模型研究

doi:10.16265/j.cnki.issn1003-3033.2024.S1.0027

摘要/Abstract

摘要：

为解决露天煤矿边坡工程因软岩强度低、蠕变特性显著导致的稳定性问题,开展软岩蠕变变形特征及本构模型研究。以蒙东地区某露天煤矿泥岩为研究对象,基于三轴蠕变试验结果,在分析传统Burgers蠕变模型的基础上,引入带应变触发的非线性黏壶,建立新型非线性5元件蠕变损伤模型,并根据最小二乘原理,辨别改进的蠕变损伤模型参数。结果表明:改进的Burgers蠕变损伤模型,与试验数据的拟合系数较高;所建模型可充分描述泥岩全阶段蠕变变形特征,尤其是加速蠕变损伤阶段;改进的蠕变损伤模型的拟合程度明显优于传统Burgers蠕变模型。

关键词: 软岩, 非线性, 蠕变模型, 损伤, 黏壶

Abstract:

In order to solve the stability problem caused by low strength and significant creep characteristics of soft rock in slope engineering of open-pit coal mines, the creep deformation characteristics and constitutive model of soft rock were studied. By taking the mudstone of an open-pit coal mine in eastern Inner Mongolia as the research object, based on the results of the triaxial creep test and the analysis of the traditional Burgers creep model, a new non-linear five-element creep damage model was established by introducing a strain-triggered non-linear dashpot. According to the principle of least squares, the parameters of the improved creep damage model were identified. The results show that the improved Burgers creep damage model has a fitting coefficient with the experimental data, which can fully describe the creep deformation characteristics of mudstone in the whole stage, especially in the accelerated creep damage stage. The fitting degree of the improved creep damage model is obviously better than that of the traditional Burgers creep model.

Key words: soft rock, non-linear, creep model, damage, dashpot

中图分类号:

X936

门树臣. 露天煤矿软岩边坡泥岩非线性蠕变损伤模型研究[J]. 中国安全科学学报, 2024, 34(S1): 59-64.

MEN Shuchen. Non-linear creep damage model of mudstone at soft rock slopes in open-pit coal mines[J]. China Safety Science Journal, 2024, 34(S1): 59-64.

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参数	G/MPa	G₁/MPa	K/MPa	η₁/(MPa·h)
值	1.021 0	1.109 0	1.522 0	150.434 8
参数	η₂/(MPa·h)	η_n₁/(MPa·h)	b	—
值	0.278 8	37.409 3	0.075 8	—