基于Hoek建议的非线性关系求取岩体抗剪强度的算法及工程应用

发布时间：2018-01-30 22:21

本文关键词： 岩石力学抗剪强度非线性关系剪应力正应力工程应用　出处：《岩土力学》2014年06期 　论文类型：期刊论文

【摘要】：阐述了Hoek建议的非线性关系原理,以此提出了求取岩体抗剪强度的算法:考虑了岩体抗剪破坏时总体或平均水平,通过计算出不同正应力?下对应的剪应力?,线性回归确定一定应力范围内线性化后的c、?值,解决了Hoek-Brown准则拟合算法不能求解一定正应力?条件下岩土的抗剪强度的问题。在对中缅油气管道(国内段)澜沧江跨域工程边坡岩体应用以及进一步对比研究,结果表明:采用文中算法给出的第1种确定正应力?的方法所得的c、?值与Hoek-Brown准则拟合算法所得的结果相差不大,究其原因是两种算法考虑的因素不太一样,导致围压3?或正应力?大小有所差别;在实际工程正应力?较低的情况下,应采用文中算法给出的第2种确定正应力?的方法来获取的c、?值,这样所得的结果才与实际情况比较接近,克服了Hoek-Brown准则拟合算法对围压3?依赖的问题。
[Abstract]:This paper expounds the principle of nonlinear relation suggested by Hoek, and puts forward an algorithm for calculating the shear strength of rock mass. Considering the overall or average level of shear failure of rock mass, the different normal stresses are calculated. Below the corresponding shear stress? Linear regression is used to determine the linearized cu in a certain stress range. Which solves the problem that the Hoek-Brown criterion fitting algorithm can not solve a certain normal stress? Application and further comparative study on rock mass of Lancang River cross region engineering of Sino-Myanmar oil and gas pipeline (domestic section). The results show that the first kind of normal stress is determined by the proposed algorithm. The method obtained by the cu? The reason is that the factors considered by the two algorithms are not the same, resulting in the confining pressure of 3? Or normal stress? There is a difference in size; in actual engineering normal stress? In the lower case, the second type of normal stress given by the algorithm in the paper should be used to determine the normal stress. To get the cu? In this way, the result is close to the actual situation, which overcomes the Hoek-Brown criterion fitting algorithm for confining pressure 3? The question of dependence
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【分类号】：TU452
【正文快照】： 1引言岩体抗剪强度是十分重要的力学参数。常通过原位试验法、经验类比法、反演分析法等获取。目前,大型岩体工程中,抗剪强度指标的确定大多依据少量试验结果和经验判断综合确定,这一过程带有较大的主观成分[1]。如何根据试验得到的、仅仅适合于试点的岩体力学参数,获得能代表

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