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岩石破坏非连续变形分析弹脆性本构模型的二次开发 被引量:5
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作者 李术才 陈云娟 +3 位作者 朱维申 赵成龙 李利平 尹福强 《岩土力学》 EI CAS CSCD 北大核心 2014年第8期2144-2149,共6页
岩石非连续变形分析方法DDARF成功实现了模拟岩体裂纹萌生、扩展、贯通、破碎的全过程,但算法只考虑了岩体的线弹性本构模型,没有分析岩体的非线性应力-应变关系。为更符合真实岩体工程,同时扩展岩石非线性本构模型的应用范围,分别采用... 岩石非连续变形分析方法DDARF成功实现了模拟岩体裂纹萌生、扩展、贯通、破碎的全过程,但算法只考虑了岩体的线弹性本构模型,没有分析岩体的非线性应力-应变关系。为更符合真实岩体工程,同时扩展岩石非线性本构模型的应用范围,分别采用摩尔-库仑强度准则和最大拉应力强度准则对岩体进行剪切和拉伸破坏判断;对理想弹脆性本构模型进行算法分析,并在VC++平台下程序实现;对"自定义"的岩体非连续变形分析方法弹脆性本构模型与室内单轴压缩试验进行比较分析;将岩体非连续变形分析方法弹脆性本构模型应用于大型地下洞室开挖,并与线弹性本构模型进行对比。结果表明,非连续变形分析方法中自定义岩体弹脆性本构模型是可行的,它能够反映岩体变形的非线性特征,与室内试验吻合度较好;非连续变形分析方法弹脆性本构模型应用于大型地下工程,能更安全且真实地分析洞室围岩的稳定性,进而更好地指导地下洞室的防护措施。 展开更多
关键词 岩石非连续变形分析 弹脆性本构 强度准则 程序编制 室内试验
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非连续变形岩石断裂分析中的一种全长剪切锚杆 被引量:6
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作者 陈云娟 李术才 +2 位作者 朱维申 王文 王旌 《岩土力学》 EI CAS CSCD 北大核心 2014年第1期293-297,共5页
锚杆从锚固方式上可划分两种:端部锚固方式和全长锚固方式。全长锚固锚杆作为工程支护中的一种重要锚杆类型,具有广泛的应用前景。非连续变形分析(DDA)以及在此基础上发展的非连续变形的岩石断裂分析(DDARF)方法中锚杆为端锚形式,且只... 锚杆从锚固方式上可划分两种:端部锚固方式和全长锚固方式。全长锚固锚杆作为工程支护中的一种重要锚杆类型,具有广泛的应用前景。非连续变形分析(DDA)以及在此基础上发展的非连续变形的岩石断裂分析(DDARF)方法中锚杆为端锚形式,且只考虑了锚杆的轴向作用,而忽略了锚杆作用力对锚固岩体的侧向限制。为了更好地理解锚杆的支护机制,考虑锚杆的剪切作用,提出了DDARF中一种新的锚固形式——全长剪切锚杆支护形式。用改进的全长剪切锚杆支护方法对一公路隧道稳定性进行了分析,并与端锚支护形式进行了对比,结果表明,提出的全长剪切锚杆支护方法是有效的,锚固效果比端锚支护更好。 展开更多
关键词 锚杆 连续变形岩石断裂分析(DDARF) 全长锚固 剪切作用 公路隧道
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An improved three-dimensional spherical DDA model for simulating rock failure 被引量:13
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作者 JIAO YuYong HUANG GangHai +2 位作者 ZHAO ZhiYe ZHENG Fei WANG Long 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第9期1533-1541,共9页
In this paper, a discontinuous numerical model, namely SDDARF3D(three-dimensional spherical discontinuous deformation analysis for rock failure), is proposed for simulating the whole process of rock failure. Firstly, ... In this paper, a discontinuous numerical model, namely SDDARF3D(three-dimensional spherical discontinuous deformation analysis for rock failure), is proposed for simulating the whole process of rock failure. Firstly, within the framework of the classical discontinuous deformation analysis(DDA) method, the formulation of three-dimensional spherical DDA(3D SDDA) is deduced; secondly, a bonding and cracking algorithm is constructed and the SDDARF3 D model is proposed; thirdly, corresponding VC++ calculation code is developed and some verification examples are calculated. The simulated results can intuitively reproduce the failure phenomena of rock mass, indicating that the proposed SDDARF3 D numerical model is correct and effective. 展开更多
关键词 rock failure three-dimensional spherical discontinuous deformation analysis crack propagation bonding and cracking algorithm
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Discontinuous deformation and displacement analysis: From continuous to discontinuous 被引量:6
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作者 TANG ChunAn TANG ShiBin +1 位作者 GONG Bin BAI HongMei 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2015年第9期1567-1574,共8页
A discontinuous deformation and displacement(DDD) analysis method is proposed for modelling the rock failure process. This method combines the rock failure process analysis(RFPA) method(based on finite element method)... A discontinuous deformation and displacement(DDD) analysis method is proposed for modelling the rock failure process. This method combines the rock failure process analysis(RFPA) method(based on finite element method) and discontinuous deformation analysis(DDA) method. RFPA is used to simulate crack initiation, propagation and coalescence processes of rock during the small deformation state. The DDA method is used to simulate the movement of blocks created by the multiple cracks modelled by the RFPA. The newly developed DDD method is particularly suitable for modelling both crack propagation and block movement during the rock failure process because of the natural and convenient coupling of continuous and discontinuous deformation analyses. The proposed method has been used to simulate crack initiation, propagation and coalescence within a slope as well as the block movement during the landslide process. Numerical modelling results indicate that the proposed DDD method can automatically simulate crack propagation and block movement during the rock failure process without degrading accuracy. 展开更多
关键词 rock failure process finite element method discontinuous deformation analysis (DDA) crack propagation slope stability
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