一种应用于射流破岩的孔隙形状近似法  

A pore shape approximation method applied in jet breaking rock

作　　者：马小晶[1] 周新超 肖新朋 程璨 MA Xiaojing;ZHOU Xinchao;XIAO Xinpeng;CHENG Can(School of Electrical Engineering,Xinjiang University,Urumqi 830017,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830017

出　　处：《振动与冲击》2023年第17期245-252,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(12002296,11762021);新疆维吾尔自治区自然科学基金(2022D01C47);新疆维吾尔自治区青年科技拔尖人才专项(2022TSYCCX0054)。

摘　　要：为了精准模拟油气资源开采领域中射流破碎孔隙岩体的动态过程,构建准确且有效的孔隙岩体是十分关键的。基于光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)方法,提体的孔隙形状近似法(pore shape approximation,PSA)。通过模拟孔隙岩体的单轴压缩试验,验证了PSA方法所构建的孔隙岩体模型与试验结果具有较好的相似性,通过引入描述水射流和岩体力学特性的本构方程,建立了射流冲击孔隙岩体的数值模型,并与数字岩心技术进行了对比,本模型具有较好的计算效率和稳定性。随后,分析了孔隙形状、尺寸和不同形状孔隙占比对岩体破损的影响。研究表明:不同形状的孔隙均存在一个使岩体破损效果最佳的尺寸;含薄片体、正三棱柱或正三角锥的孔隙岩体更容易破损,这三种孔隙的占比越高,岩体破损效果越明显。Here,to accurately simulate dynamic processes of jet crushing porous rock bodies in field of oil and gas resource extraction,it was crucial to construct the accurate and effective porous rock body.Based on the smoothed particle hydrodynamics(SPH)method,the pore shape approximation(PSA)method was proposed to approximate pore shape of extract body.Through simulating uniaxial compression tests of porous rock body,the porous rock body model constructed with PSA method was verified to have better similarity with the simulated test results.By introducing constitutive equations to describe mechanical properties of water jet and rock body,the numerical model of jet impacting porous rock body was established,and compared with the digital core technology.The results showed that a model to construct porous rock body has better computational efficiency and stability.Then,effects of pore shape,size and proportions of pores with different shapes on rock body damage were analyzed.The study showed that pores with different shapes all have a size to make the rock body damage effect reach the optimal;porous rock bodies containing thin slices,regular triangular prisms or regular triangular pyramids are easier to be damaged;the higher the proportion of these 3 types of pores,the more obvious the rock body damage effect.

关 键 词：孔隙形状近似 光滑粒子流体动力学(SPH)方法 孔隙尺寸 孔隙结构 射流破岩 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3