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

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 、 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 、 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 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 、 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 依赖的问题。

An algorithm of obtaining shear strength of rock mass based on nonlinear relationship proposed by Hoek and its application to engineering

A principle of nonlinear relationship proposed by Hoek is elaborated, then based on that, a new algorithm of obtaining shear strength of rock mass is brought forward by considering the overall or average level when rock mass is broken. Through the new algorithm, the magnitudes of shear stress can be calculated at different given normal stresses, and a series of shear stress and normal stress are generated; then the values of cohesion and internal frictional angle are determined via linear regression analysis, which solves the determination of shear strength under certain normal stress that Hoek-Brown criterion fitting algorithm can not do. Then a research on shear strength of rock mass from China-Myanmar oil and gas pipelines (domestic section) Lancang River across domain engineering as an example and a further comparison study is taken. It is shown that the values of cohesion and internal frictional angle determined by the first method according to the new algorithm are little different to these gained through the Hoek-Brown criterion fitting algorithm. The reason is that the factors considered are not the same, while the normal stress is in considered by the two algorithms resulting in confining pressure and normal stress are varied practical engineering is low, the cohesion and internal friction angle proposed by the second method according to the new algorithm, the results obtained are close to the actural situation, which has overcome the problem that Hoek-Brown criterion fitting algorithm relies on the confining pressure.