摘要
岩体力学参数的选取对岩土工程稳定性分析至关重要,但受地质因素的不确定性及人员的主观性,参数的选取较大程度影响到边坡稳定性评价的合理性。基于此,将区间理论引入到参数的取值及稳定性分析的过程中,使所求得的稳定性系数为一阈值,区间值可表示出岩体力学参数与边坡安全系数的可能变动范围,比选用定值计算分析合理一些。同时文中采用节理特征系数Jc与岩块体积数Vb的数学表达式共同量化地质强度指标GSI的取值,比选用Sonmez.H的表格量化GSI法更具有客观性。以湖南省永吉高速某节理型软岩边坡为工程实例,验证了采用基于广义Hoek-Brown准则的岩质边坡稳定区间分析的便捷性、可行性和稳健性。
The selection of rock mechanical parameters is crucial for geotechnical stability analysis. Nonlinear Hoek-Brown strength criteria based on could offer project practice a method for slope stability analysis. With the uncertainty of geological factors and subjectivity of the personnel,the rationality of slope stability analysis is affected by parameters selection. Based on it,the interval theory is introduced to the selection of the parameters and stability analysis in the process,to gain the stability factor as a threshold. Interval values could be expressed and rock mechanical parameters of slope safety factor may be the scope of the changes,it is more reasonable than with fixed value calculation analysis. And the mathematical expression of jointing characteristic coefficient Jcand volume number Vbwas used to quantify and which is more objectivity than using the Sonmez. H GSI quantitative table. A jointed soft rock slope of Yong-Ji expressway as example,verified that the convenience,availability and robustness using interval analysis of slope stability based on generalized Hoek-Brown criteria.
出处
《公路工程》
北大核心
2014年第5期21-24,30,共5页
Highway Engineering
基金
国家自然科学基金项目(51208063)
