裂隙单元修正等效渗透率模型及其验证

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (1191 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要采用裂隙单元表征裂隙网络，引入裂隙单元等效渗透率的概念，按照流量等效的原则计算其大小，然而阶梯状裂隙单元造成渗流流程的增加，同时压差不变导致流量的减少，为解决这一问题，用裂隙在网格中的实际流程长度与裂隙迹长之比来修正裂隙单元等效渗透率，并且针对复杂裂隙网络，对其进行预处理——删除孤立裂隙、死端裂隙、孤立裂隙簇等非连通裂隙。用此修正模型对单裂隙、相交裂隙、复杂裂隙网络进行渗流数值模拟，并与理论解及离散裂隙网络模型方法渗流结果进行比较，结果显示：研究区域下游出口总流量及出口处流量分布均取得较好一致性；同时，此裂隙单元修正等效渗透率模型也能反映出裂隙岩体渗流的非均质和各向异性。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：岩石力学, 裂隙单元等效渗透率, 等效多孔介质模型, 离散裂隙网络模型, 裂隙岩体

Abstract：A conceptual model of fracture element is presented that characterizes the discrete fracture network with fracture elements. We calculate the equivalent permeability of fracture element based on the principle of equivalence of flux between a single fracture and a square element. But the“stair-case”fracture elements increase the length of flow path，and result in a decrease of flux with an unaltered hydraulic pressure difference. To solve this problem，we modify the fracture elementary permeability through considering the ratio of length of flow path to fracture length；and for the complex fracture network，the isolated fractures，dead-end parts of fractures and the isolated fracture clusters are deleted to build up a connected fracture configuration. To verify the modified equivalent permeability model we perform fluid flow simulations on a series of single fracture，intersecting fractures and complex fracture network. The calculated total flow rate and flux distribution along the downstream outlet are consistent with the analytical results and discrete fracture network model results. The modified equivalent permeability model can also characterize the heterogeneity and anisotropy of fluid flow in fractured rock mass.

Key words： rock mechanics equivalent fracture elementary permeability equivalent porous media model discrete fracture network(DFN) model fractured rock mass

收稿日期: 2012-10-30

引用本文:

王臻1，2，RUTQVIST Jonny2，左建平2，3，戴瑛1 . 裂隙单元修正等效渗透率模型及其验证[J]. 岩石力学与工程学报, 2013, 32(4): 728-733.
WANG Zhen1，2，RUTQVIST Jonny2，ZUO Jianping2，3，DAI Ying1. A MODIFIED EQUIVALENT PERMEABILITY MODEL OF FRACTURE ELEMENT AND ITS VERIFICATION. , 2013, 32(4): 728-733.

链接本文:

http://www.rockmech.org/CN/Y2013/V32/I4/728

[1]	宋晓晨，徐卫亚. 裂隙岩体渗流概念模型研究[J]. 岩土力学，2004，25(2)：226-232.(SONG Xiaochen，XU Weiya. A study on conceptual models of fluid flow in fractured rock[J]. Rock and Soil Mechanics，2004，25(2)：226-232.(in Chinese))
[4]	LONG J C S，REMER J S，WILSON C R，et al. Porous media equivalents for networks of discontinuous fractures[J]. Water Resources Research，1982，18(3)：645-658. " target="_blank">
[7]	SVENSSON U. A continuum representation of fracture networks. Part I：Method and basic test cases[J]. Journal of Hydrology，2001，250(1/4)：170-186. " target="_blank">
[8]	DOUGHTY C，SALVE R，WANG J S Y. Liquid-release tests in unsaturated fractured welded tuffs：II. Numerical modeling[J]. Journal of Hydrology，2002，256(1/2)：80-105. " target="_blank">
[10]	MCKENNA S A，REEVES P C. Fractured continuum approach to stochastic permeability modeling[C]// COBURN T C，YARUS J M，CHAMBERS R L，ed. Stochastic Modeling and Geostatistics：Principles，Methods，and Case Studies. [S. l.]：[s. n.]，2006：173-186. " target="_blank">
[2]	王恩志，王洪涛. 三维裂隙网络渗流数值模型研究[J]. 工程力学，1997，(增2)：520-525.(WANG Enzhi，WANG Hongtao. Study on numerical model of three-dimensional fluid flow in fracture network[J]. Engineerign Mechanics，1997，(Supp.2)：520-525.(in Chinese)) " target="_blank">
[6]	PAN P Z，FENG X T，HUANG X H，et al. Coupled THM processes in EDZ of crystalline rocks using an elastoplastic cellular automaton[J]. Environmental Geology，2009，57(6)：1 299-1 311. " target="_blank">
[12]	LI J H，ZHANG L M，WANG Y，et al. Permeability tensor and representative elementary volume of saturated cracked soil[J]. Canadian Geotechnical Journal，2009，46(8)：928-942. " target="_blank">
[14]	ZHAO Z，RUTQVIST J，LEUNG C，et al. Impact of stress on solute transport in a fracture network：A comparison study[J]. Journal of Rock Mechanics and Geotechnical Engineering，2013，to be pressed. " target="_blank">
[5]	MIN K B，JING L，STEPHANSSON O. Determining the equivalent permeability tensor for fractured rock masses using a stochastic REV approach：method and application to the field data from Sellafield， UK[J]. Hydrogeology Journal，2004，12(5)：497-510. " target="_blank">
[11]	赵红亮，陈剑平. 裂隙岩体三维网络流的渗透路径搜索[J]. 岩石力学与工程学报，2005，24(4)：622-627.(ZHAO Hongliang，CHEN Jianping. Searching for seepage path of 3D network in fractured rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(4)：622-627.(in Chinese))
[13]	PRUESS K，OLDENBURG C M，MORIDIS G J. TOUGH2 User?s guide version 2[R]. [S. l.]：Lawrence Berkeley National Laboratory，1999. " target="_blank">
[3]	宋晓晨，徐卫亚. 裂隙岩体渗流模拟的三维离散裂隙网络数值模型(I)：裂隙网络的随机生成[J]. 岩石力学与工程学报，2004，23(12)：2 015-2 020.(SONG Xiaochen，XU Weiya. Numerical model of three-dimensional discrete fracture network for seepage in fractured rocks(I)：generation of fracture network[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(12)：2 015-2 020.(in Chinese)) " target="_blank">
[9]	ITO K，SEOL Y A. Three-dimensional discrete fracture network generator to examine fracture-matrix interaction using TOUGH2[C]// Proceedings of the TOUGH2 symposium 2003 Lawrence Berkeley National Laboratory. Berkeley：[s. n.]，2003：12-14. " target="_blank">
[15]	RUTQVIST J，LEUNG C，HOCH A，et al. Linked multicontinuum and crack tensor approach for modeling of coupled geomechanics，fluid flow and transport in fractured rock[J]. Journal of Rock Mechanics and Geotechnical Engineering，2013，5(1)：18-31. " target="_blank">