当前位置: X-MOL 学术Bull. Eng. Geol. Environ. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Experimental investigation of pore-fracture relationship on failure behaviour of porous rock materials
Bulletin of Engineering Geology and the Environment ( IF 3.7 ) Pub Date : 2022-08-05 , DOI: 10.1007/s10064-022-02857-y
Enes Zengin , Zeynal Abiddin Erguler

Fracturing leading to the failure of rock material is related to the inherent properties of the rock, such as pores with different peculiarities. Most of the studies focusing on the effect of porosity and pore parameters on the failure behaviour of rock materials have significant limitations in assuming the porosity as a single value representing the whole. However, due to the complex structure, the scalar quantity of porosity can differ from the actual porosity. The three-staged method was applied to determine representative porosity, and the results were verified with a CT scan on the selected samples. This study investigated the effect of porosity and pore parameters on rock materials’ failure behaviour using experimental approaches involving unconfined and confined stress conditions. It was concluded that the samples involving regular-shaped pores show stepwise failure behaviour, which affects fracturing among the samples regardless of the pore diameter prior to the ultimate failure under unconfined stress conditions. Moreover, due to samples with a wide range of porosity values, 10%, a threshold value for the porosity, has emerged, separating a different relationship with peak strength and elasticity of modulus values. The primary parameter controlling failure in samples above this threshold value is the total porosity of the sample regardless of pore geometry. In addition, up to a 15-fold increase was obtained under the confined conditions compared to the unconfined peak strength values on the samples having regular-shaped pores. This difference is only up to two times on the sample having irregularly shaped pores.



中文翻译:

孔隙-断裂关系对多孔岩石材料破坏行为的试验研究

压裂导致岩石材料的破坏与岩石的固有特性有关,如孔隙具有不同的特性。大多数关注孔隙度和孔隙参数对岩石材料破坏行为的影响的研究在将孔隙度假设为代表整体的单个值方面存在很大的局限性。然而,由于结构复杂,孔隙度的标量可能与实际孔隙度不同。应用三阶段方法确定代表性孔隙度,并通过对所选样品进行 CT 扫描验证结果。本研究使用涉及无约束和约束应力条件的实验方法研究了孔隙度和孔隙参数对岩石材料破坏行为的影响。得出的结论是,包含规则形状孔隙的样品表现出逐步破坏行为,无论在无侧限应力条件下最终破坏之前的孔径如何,这都会影响样品之间的压裂。此外,由于样品的孔隙率值范围很广,出现了孔隙率阈值 10%,与峰值强度和弹性模量值的关系不同。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。无论在无侧限应力条件下最终破坏之前的孔径如何,这都会影响样品之间的压裂。此外,由于样品的孔隙率值范围很广,出现了孔隙率阈值 10%,与峰值强度和弹性模量值的关系不同。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。无论在无侧限应力条件下最终破坏之前的孔径如何,这都会影响样品之间的压裂。此外,由于样品的孔隙率值范围很广,出现了孔隙率阈值 10%,与峰值强度和弹性模量值的关系不同。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。此外,由于样品的孔隙率值范围很广,出现了孔隙率阈值 10%,与峰值强度和弹性模量值的关系不同。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。此外,由于样品的孔隙率值范围很广,出现了孔隙率阈值 10%,与峰值强度和弹性模量值的关系不同。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。超过该阈值的样品中控制失败的主要参数是样品的总孔隙率,而与孔隙几何形状无关。此外,与具有规则形状孔的样品的无限制峰值强度值相比,在限制条件下获得了高达 15 倍的增加。这种差异在具有不规则形状孔的样品上最多只有两倍。

更新日期:2022-08-05
down
wechat
bug