考虑围压影响的非均质岩石剪胀扩容模型  

Dilation Model of Heterogeneous Rock Affected by Confined Pressure

作　　者：张春会[1] 赵全胜[1] 于永江[2] 

机构地区：[1]河北科技大学建筑工程学院,河北石家庄050018 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《采矿与安全工程学报》2011年第3期436-440,共5页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金重点项目(50434020);河北省自然科学基金项目(E2010000872;E2011208036)

摘　　要：为了描述围压对非均质岩石剪胀扩容行为的影响,通过扩容指数建立了剪胀角和围压之间的关系式.利用Weibull分布考虑岩石力学参数的非均质性,假设岩石为理想弹塑性材料,建立了考虑围压影响的非均质岩石剪胀扩容模型,并在FLAC软件下利用Fish函数法予以实现.数值算例按3种方案研究了不同侧限下平面应变煤样的破坏行为,结果表明:1)剪胀角对岩石力学承载能力的发挥有一定影响.在其他条件一定的情况下,剪胀角增加会使得岩石的强度略有提高.2)随着剪胀角增加,岩石破坏单元的体积膨胀变大,剪切带面积也增大.3)本文模型能反映围压对岩石剪胀扩容行为的影响.To reflect the effect of confined pressureon the dilation of rocks,we study the relationship between dilation angle and confined pressure and simulate the heterogeneity of rock using Weibull distribution.In the simulation,the rock is supposed to be an ideal elastic-plastic material.Then the dilation model of heterogeneous rock with confined pressure is established and realized in FLAC.In the case study,three sets of schemes in a uniaxial plane strain compression and varied lateral restraint are discussed.The main conclusions are that 1） the dilation angle has a certain effect on the bearing capacity of rock and the strength of rock increases with the increase of dilation angle;2） with the increase of dilation angle,the post-strength element of rock dilates much great and the area of the shear bands also increases;3） the model can reflect the effect of confined pressure on the dilation of rock.

关 键 词：围压 剪胀 WEIBULL分布 

分 类 号：TD315[矿业工程—矿井建设]