含内裂纹试件水-力耦合裂纹扩展研究

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英文篇名：Study on Crack Propagation of Water-Force Coupling in Specimen with Internal Crack 作者：胡必成 英文作者：HU Bi-cheng;Huizhou Hydropower Construction Co.Ltd.; 关键词：三维内裂纹 ; 双轴 ; 水-力耦合 ; 裂纹扩展 英文关键词：three-dimensional internal crack;;biaxial;;water-force coupling;;crack propagation 中文刊名：水利科技与经济 英文刊名：Water Conservancy Science and Technology and Economy 机构：惠州市水电建筑工程有限公司; 出版日期：2019-06-30 出版单位：水利科技与经济 年：2019 期：06 基金：国家自然科学基金项目(51569004) 语种：中文; 页：10-14 页数：5 CN：23-1397/TV ISSN：1006-7175 分类号：TU45

摘要

为研究三维内裂纹在水-力耦合下的裂纹扩展规律,利用著名断裂力学计算软件Franc3d对双轴条件下含内裂纹标准立方体试件水力压裂进行数值模拟,得到了裂纹的扩展过程以及裂纹尖端的应力强度因子的分布。计算结果表明:①利用三维断裂有限元计算软件Franc3d对水-力耦合下的裂纹扩展过程进行了数值模拟,可见Franc3d软件在模拟水-力耦合下的裂纹扩展问题上具有很大的优越性;②裂纹扩展沿着预制裂纹尖端进行萌生,沿着最大主应力方向进行扩展,最终裂纹与最大主应力方向呈现一定的夹角;③对裂纹尖端的应力强度因子进行了计算,可以发现水-力耦合下的内裂纹扩展为Ⅰ-Ⅱ-Ⅲ型复合。
        In order to study the crack propagation law of three-dimensional internal crack under water-force coupling,the hydraulic fracturing of standard cube specimen with internal crack under biaxial condition was numerically simulated by using the famous fracture mechanics calculation software Franc3 d. The crack propagation process and the distribution of stress intensity factor at the crack tip are obtained. The results show that: ①the crack propagation process under the coupling of water and force is numerically simulated by using the three-dimensional fracture finite element software Franc3 d. It can be seen that the Franc3 d software has great superiority in simulating the crack propagation problem under hydro-mechanical coupling. ②crack propagation along the The crack tip is initiated and propagated along the direction of the maximum principal stress,and the crack and the maximum principal stress direction show a certain angle. ③the stress intensity factor at the crack tip is calculated. It can be found that the internal crack propagates to Ⅰ-Ⅱ-Ⅲ type composite under the water-force coupling.

引文

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