地下洞室岩体变形模量的尺寸效应研究

张占荣

地下洞室岩体变形模量的尺寸效应研究

张占荣

中铁第四勘察设计院集团有限公司武汉 430063

基金项目:

十一五国家科技支撑计划(2008BAB29B01-1)

详细信息

作者简介:
张占荣,工程地质专业.Email: zzrwh@126.com

中图分类号: TU452
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出版历程
- 收稿日期: 2009-10-02
- 修回日期: 2011-08-16
- 刊出日期: 2011-10-25

SIZE EFFECT TO ROCK MASS DEFORMATION MODULUS FOR UNDERGROUND HOUSE

ZHANG Zhanrong

China Railway Siyuan Survey and Design Group Co. ,Ltd.,Wuhan 430063

摘要

摘要: 变形参数是岩体工程变形计算、稳定性评价的前提,岩体变形参数的合理取值一直是岩土工程界关注的热点和难点之一。由于岩体力学参数存在随研究尺度不同而变化的特性,被称之为岩体力学参数的尺寸效应,因此由室内试验获取的岩石力学参数,甚至现场试验获取的岩体力学参数,均代表不了岩体工程尺度实际的力学特性,不能直接用于工程实际。为获取能够直接应用于工程实际的岩体力学参数,有必要对岩体力学参数随尺度的变化规律及产生机理展开系统研究。本文结合工程实例,通过多尺度方法研究了裂隙岩体变形参数的尺寸效应,采用室内试验、现场承压板试验、波速测试、数值模拟、位移反演分析等不同尺度的研究方法,获取了不同尺度的岩体力学参数。研究表明随着岩体尺寸的增加,岩体变形模量呈明显的降低趋势,由回归分析得到了岩体变形参数与尺度之间的拟合关系式,当岩体尺寸大于30m后,岩体变形模量减小的趋势逐渐趋于稳定,由此确定了该工程岩体宏观变形模量及REV尺度。在此基础上,对裂隙岩体变形模量尺寸效应的产生机理进行探讨,表明岩体变形参数尺寸效应的产生机理主要是由于不同尺度岩体所涵盖的裂隙尺度不同所造成,节理岩体的REV尺度约为典型结构面迹长的3倍左右。基于多种试验方法成果与数理统计方法相结合研究岩体变形参数的尺寸效应是一种新的尝试,为该工程岩体力学参数的合理取值提供了依据,并可为类似工程提供有益借鉴。
- 岩体 /
- 力学参数 /
- 变形模量 /
- 尺寸效应 /
- 多尺度方法 /
- 统计分析
Abstract: Deformation parameters of engineering rock mass are important necessary precondition for deformation calculation and stability analysis.So the reasonable selection on the deformation parameters is a focus and difficulty in geotechnical engineering.Because of size effect,the mechanical parameters would change with the research size of rock mass.Mechanical parameters from laboratory test,even from in-situ test can't exactly represent the characteristics of the engineering rock mass.In order to get mechanical parameters of the engineering rock mass that can be applied to practical engineering directly,the size effect of rock mass parameters and its mechanism of production need to be systemically studied.The size effect of rock mass deformation parameters is studied by multi-scale methods combined with specific engineering project.Deformation modulus with different sizes of rock mass are got from the experiments of laboratory test,in-situ plate load test,wave velocity test,numerical simulation and displacement back analysis.It is found that the rock mass deformation modulus decreases significantly as the rock mass size increases.When the tested rock mass size is larger than 30m,the deformation modulus of rock mass tends to be stable.Equations between deformation modulus and rock mass size are got with regression analysis.Then the macro-mechanical parameters and the REV scale are obtained.Finally,the mechanism of the size effect to rock mass deformation modulus is discussed.It shows the structural planes with different size within rock mass are the intrinsic cause for the mechanism.The REV scale of jointed rock mass is about 3 times of the length of the main structure.When the size is larger than the REV scale,the deformation modulus of rock mass would became a stable value.It is a new attempt to survey the macro parameters of rock mass by combination of multi-scale methods and statistics theory.The findings presented in this paper can provide a useful reference to the parameter determination of rock mass in geotechnique engineering and other similar projects.
- Rock mass /
- Mechanical parameters /
- Deformation modulus /
- Size effect /
- Multi-scale method /
- Statistical analysis

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参考文献(1)

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