Coupling model of disk splitting for expansive rock mass in deep storage considering water infiltration,Energy Science & Engineering

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Coupling model of disk splitting for expansive rock mass in deep storage considering water infiltration
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/ese3.729
Zenghui Zhao _{1,

2} , Xiaojie Gao _{1,

2} , Shaojie Chen _{1,

2} , Mingzhong Zhang _{1,

2} , Wei Sun _{1,

2}

Affiliation

Energy storage in deep underground and mineral mining has currently become a hot research topic. To investigate the tensile failure of expansive soft rocks, a disk splitting mechanical model was established under a coupled action of the humidity and mechanical fields. Then, based on the theory of humidity stress field and the solution to the stress of a semi‐infinite body under the action of a concentrated force, an analytical formula for the stress of the disk under the action of the two fields was derived. Using the analytical formula, the influence of the humidity field and disk physical parameters on the distribution of the stress field on the disk under the coupled humidity‐mechanical action was further analyzed. Finally, the formula for the splitting tensile strength of expansive soft rocks under the influence of humidity was modified. The analysis results showed that the stress evolution of the disk under the coupled humidity‐mechanical action was completely different from that under a single‐load action. The stress concentration was generated at the dry‐wet interface of the disk. In addition, the range and value of the stress concentration zone increased with the increase in the humidity of the external environment, elastic modulus of soft rock, and linear expansion coefficient. Under the action of a single load, the cracking position was at the center of the disk. In contrast, under the coupled humidity‐mechanical action, the cracking position was transferred to the intersection of the dry‐wet interface and the loading direction. The above results can provide preliminary theoretical guidance for understanding the tensile failure mechanism of expansive soft rocks.

中文翻译：

考虑水渗透的深层膨胀岩体圆盘分裂耦合模型

地下深部的能量存储和矿物开采目前已成为研究的热点。为了研究膨胀软岩的拉伸破坏，在湿度和机械场的耦合作用下建立了圆盘分裂力学模型。然后，根据湿度应力场理论和集中力作用下半无限大体的应力解，推导了两个场作用下圆盘应力的解析公式。使用解析公式，进一步分析了湿度场和磁盘物理参数对耦合的湿力作用下磁盘上应力场分布的影响。最后，修改了湿气作用下膨胀软岩劈裂抗拉强度的计算公式。分析结果表明，在湿-力耦合作用下，圆盘的应力演化与单载荷作用下的应力演化完全不同。应力集中在磁盘的干湿界面处产生。此外，应力集中区的范围和值随着外部环境湿度，软岩弹性模量和线性膨胀系数的增加而增加。在单个载荷的作用下，裂纹位置位于圆盘的中心。相反，在湿-力耦合作用下，开裂位置转移到干湿界面和加载方向的交点。以上结果可为理解膨胀软岩的拉伸破坏机理提供初步的理论指导。

更新日期：2020-05-25

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