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自20世纪70年代以来,强度折减法逐步被用于评价岩土工程稳定性。对于线性的Mohr-Coulomb准则,由于其抗剪参数的折减物理意义明确,得到了学术界的一致认可。Hoek提出的非线性半经验Hoek-Brown强度准则,也已被岩石工程所广泛应用,然而关于其强度参数的折减,国内外存在着较大的分歧。首先,介绍了非线性强度折减技术的基本理论;然后,在船梁子斜坡稳定性分析中,分别采用非线性强度折减法和极限平衡理论进行计算,并对两种方法得到的边坡安全系数及破坏滑移面进行比较,分析表明,非线性强度折减技术和极限平衡理论结果基本吻合;最后,通过与等效Mohr-Coulomb法的结果对比分析,验证了非线性强度折减法在岩质边坡稳定性分析中的合理性和适用性。
Since the 1970s, the strength reduction method has been gradually used to evaluate geotechnical stability. For the linear Mohr-Coulomb criterion, it has been unanimously approved by the academic community due to the clear physical meaning of the shear parameter reduction. Hoek’s nonlinear semi-empirical Hoek-Brown strength criterion has also been widely used in rock engineering, however, there are big differences at home and abroad regarding the reduction of its strength parameters. First of all, the basic theory of nonlinear strength reduction technology is introduced. Then, in the stability analysis of the ship’s girder slope, the nonlinear strength reduction method and the limit equilibrium theory are respectively used to calculate, and the slope safety factor And destroying the slip surface. The analysis shows that the nonlinear strength reduction technique basically agrees with the limit equilibrium theory. Finally, by comparing with the results of the equivalent Mohr-Coulomb method, the nonlinear strength reduction method is validated in the rock quality Slope Stability Analysis of the rationality and applicability.