【作者】 封志军；

【导师】 周德培；

【作者基本信息】 西南交通大学 ， 岩土工程， 2005， 硕士

【摘要】 本论文提出了更适合于红层软岩特殊性质和地质特征的岩体力学参数的分析和选用方法,取得了如下研究成果和结论。 (1) 研究了影响边坡稳定性的各种岩土参数,分析了各参数对边坡稳定的敏感性,给出了相应的计算公式和曲线图,以及各参数敏感性的排序。同时给出了这些参数的取值范围。 (2) 根据岩土参数随机性和模糊性提出了按随机-模糊理论处理试验数据的方法,与传统数理统计方法相比有计算结果变异性小、对红层软岩适用性更好的优点。 (3) 利用数值计算分析红层软岩坡体稳定性时,建议采用Hoek-Brown准则确定关键岩体力学参数。总结出了利用BQ指标估算Hoek-Brown准则中的GSI指标和岩体弹性模量的经验公式,结合红层软岩的特殊性质和地质特征,总结出了按此准则确定岩体力学参数的成套方法。此外,还提出了考虑红层软岩质量分级和坡体结构选取岩体力学参数的综合方法。通过依托工程的数值计算分析,验证了这种方法选取岩体力学参数的合理性。 (4) 利用极限平衡法分析红层软岩坡体稳定性时,提出了采用极限平衡软件自动搜索滑移面的位置和利用Barton公式确定节理面的抗剪强度。引入了一个反映结构面起伏度的参数,将Barton给出的标准曲线量化,从而减小了确定结构面起伏度的不确定性。通过依托工程的实例分析,验证了以上方法选取岩体力学参数的合理性。更多还原

【Abstract】 Based on the research findings, a new way to confirm the rock mass mechanical parameters is presented. This way is more adapted for weak rocks of red layer. The main results and conclusions can be expressed as follows:1 The key mechanical parameters of rock mass and their range needed for slope stability analysis are summarized. The sensitivity of thesel parameters to slope stability is obtained. The formulas, influence graphs and sensitivity sequence of mechanical parameters are presented.2. Because of the random and fuzzy characteristics of rock parameters, The random-fuzzy method is intrduced in the paper to analyze the rock mechanical parameters. The results show that the random-fuzzy method is more realistic and reliable than conventional methods.3. In the numerical analysis of slope stability, Hoek-Brown method is suggested to confirm rock mass mechanical parameters. The experience formulas to compute GSI and the Young’s modulus of rock mass with BQ are established. The auther also put forth a way which consider the rock mass classification and the makeup of slope to confirm the rock mass’s mechanical parameters.4. During the process of limit equilibrium analysis, we use the software to search the position of slide surfaces. The Barton formula is introduced to confirm the shear strengths of interfaces. A new parameter is putted forward to express the wave of interface which make the confirmation of JRC more accurate. Some examples are offered to explain and verify these methods.更多还原