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岩石应变软化及渗透率演化模型和试验验证
引用本文:张春会,郑晓明. 岩石应变软化及渗透率演化模型和试验验证[J]. 岩土工程学报, 2016, 38(6): 1125-1132. DOI: 10.11779/CJGE201606020
作者姓名:张春会  郑晓明
作者单位: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
基金项目:河北省自然科学基金项目(E2013208148,E2015208089)
摘    要:为预测承载岩石的应变软化和渗透率演化,基于Gebdykes白云岩的三轴试验结果,分析了围压对岩石弹性模量、破坏应变、峰值强度、强度退化过程、残余强度和剪胀扩容的影响规律。将岩石变形全过程简化为3阶段,使用强度退化指数、脆性模量系数和扩容指数改进FLAC中的SS模型,建立了考虑围压影响的岩石应变软化模型。基于淮南潘一矿煤、凝灰岩、巴里坤砂岩、山西安家岭泥岩的渗透率与体积应变实验数据,建立了基于体积应变增透率的岩石渗透率演化模型,与改进SS模型结合,建立了考虑围压影响的岩石应变软化和渗透率演化模型。利用本文模型分别模拟了安家岭泥岩和Gebdykes白云岩的三轴压缩、渗透率演化和体积扩容过程,结果表明:1体积应变渗透率演化模型能较好地描述体积应变与渗透率的关系;2本文模型能较好地模拟围压对岩石残余强度、峰后强度退化过程和剪胀扩容的影响,能较准确预测承载岩石的渗透率演化。

关 键 词:应变软化  改进SS模型  体积应变增透率  渗透率演化  
收稿时间:2015-04-17

Strain softening and permeability evolution model of loaded rock and experimental verification
ZHANG Chun-hui,ZHENG Xiao-ming. Strain softening and permeability evolution model of loaded rock and experimental verification[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(6): 1125-1132. DOI: 10.11779/CJGE201606020
Authors:ZHANG Chun-hui  ZHENG Xiao-ming
Affiliation:1. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;2. Department of Mechanics and Science Engineering, Liaoning Technical University, Fuxin 23000, China
Abstract:To predict the strain softening behaviors and permeability evolution of the loaded rock, according to the tri-axial compression experimental results of Gebdykes dolomite, the effects of the confining pressure on the elastic modulus, failure strain, peak strength, strength degradation process, residual strength and dilatancy are analyzed. The whole deformation process of loaded rock is divided into three stages. The strength degradation index, brittle modulus coefficient and dilatant index are employed to improve the SS model (strain softening model) in FLAC, and a new strain softening model with the effects of confining pressure is proposed. According to the test data analysis of the permeability VS volumetric strain obtained including the coal of Huainan Panyi mine, tuff, sandstone of Balikun mine, mudstone of Anjialing, a permeability evolution model based on the enhanced permeability of volumetric strain is established. Based on the improved SS model, the strain softening and permeability evolution model of loaded rock is set up. The processes of the tri-axial compression, permeability evolution and dilatancy of Anjialing mudstones and Gebdykes dolomite are numerically modeled using the proposed model. The results show that (1) The permeability evolution model of the enhanced permeability of volumetric strain can better describe the relationship between the permeability and the volumetric strain. (2) The proposed model can better numerically model the effects of confining pressure on the residual strength, strength degradation process, dilatancy and permeability evolution of loaded rock.
Keywords:strain softening  improved SS model  enhanced-permeability of volumetric strain  permeability evolution  
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