Numerical Simulation of Rock Failure Process under Coupling Effect of Thermal Stress and Inner Pressure

黄鑫; 唐世斌; 包春燕; 唐春安

doi:10.13409/j.cnki.jdpme.2017.04.016

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Numerical Simulation of Rock Failure Process under Coupling Effect of Thermal Stress and Inner Pressure

更新时间：2025-12-11

- Numerical Simulation of Rock Failure Process under Coupling Effect of Thermal Stress and Inner Pressure
- Vol. 37, Issue 4, Pages: 611-620(2017)
- 作者机构：
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- DOI：10.13409/j.cnki.jdpme.2017.04.016
  CLC： 34
- Published：2017
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[1]黄鑫,唐世斌,包春燕,唐春安.热应力与膨胀力耦合作用下岩石破裂机理的数值模拟研究[J].防灾减灾工程学报,2017,37(04):611-620.

黄鑫, 唐世斌, 包春燕, et al. Numerical Simulation of Rock Failure Process under Coupling Effect of Thermal Stress and Inner Pressure[J]. 2017, 37(4): 611-620.
[1]黄鑫,唐世斌,包春燕,唐春安.热应力与膨胀力耦合作用下岩石破裂机理的数值模拟研究[J].防灾减灾工程学报,2017,37(04):611-620. DOI： 10.13409/j.cnki.jdpme.2017.04.016.

黄鑫, 唐世斌, 包春燕, et al. Numerical Simulation of Rock Failure Process under Coupling Effect of Thermal Stress and Inner Pressure[J]. 2017, 37(4): 611-620. DOI： 10.13409/j.cnki.jdpme.2017.04.016.

摘要

基于静态破碎剂破岩机理

运用数值模拟方法研究了内部含圆孔的方形岩样在热应力与膨胀力耦合作用下的破坏过程

重点分析了热应力对材料破坏机理的影响

并与物理实验进行了比较。结果表明:在内部热应力与膨胀力耦合作用下

模型中的两条裂纹萌生于垂直于模型边缘的孔径方向上的某个位置

而不是圆孔周围或者模型边缘

并同时向内和向外扩展至模型的内壁和外壁。随着模型热传导系数的增大

起裂位置向模型边缘移动;随着静态破碎剂膨胀系数的增大

起裂位置向圆孔周围移动。同时也研究了相同模型在只有热应力与只有膨胀力作用时的应力场

发现在此模型中热应力对起裂位置和减少裂纹数量有重要影响

耦合作用下的模型破坏是只有热应力作用和只有膨胀力作用的一种综合作用结果。

Abstract

Based on the mechanism of rock failure induced by static cracking agent（SCA）

a numerical simulation test was carried out to study the failure process of a square rock sample containing an internal round hole under the coupling effect of thermal stress and inner pressure

with a focus on the effect of thermal stress on the material’s failure mechanism. The failure process of the model was then compared with that observed in a physical experiment. The results indicate that under coupling effect of thermal stress and inner pressure

two cracks started at positions between the surface of the hole and the edge of the model

rather than around the two boundaries

and then propagated radially in two directions: inward to the hole’s surface and outward to the edge of the model. The initial locations of the cracks got closer to the edge of the model as the thermal conductivity of the model increased. As the expansive coefficient of static cracking agent increased

the initial locations gradually approached the hole. Moreover

the stress field of the model subjected to only thermal stress or inner pressure respectively was investigated. The results suggest that the thermal stress has an important impact on the initial locations and number of cracks. And the failure of the model under coupling effect was the result of the combined effect of individual thermal stress and inner pressure.

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references

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