强度储备安全系数不同定义对稳定系数的影响

Effect on Safety Factors in Different Definitions Based on Strength Margin

在极限平衡的双安全系数分析中,安全系数有ct、anφ的安全储备(定义1)和岩土参数α、k的安全储备(定义2)2种定义,分析了在应用有限元强度双折减系数法计算边(滑)坡安全系数时,强度储备的不同定义对计算结果的影响。2种安全系数定义得到的安全系数是不一样的,但是,强度参数c,tanφ按一定比例折减的同时,岩土参数α,k同时也在按相同的比例进行折减。Drucker-Prager准则与参数α和k的选取直接相关,若采用外接D-P准则,对于各种土体定义1和定义2得到的边(滑)坡的安全系数比较接近;若采用平面应变匹配D-P准则及等面积圆D-P准则,对于结构性黏土,定义2得到的安全系数略小于定义1,但对于滑体和滑带土为很粗的碎石土时,定义2得到的安全系数与定义1得到的安全系数要小得多。

There are two kinds of definitio ns for safety factors based on （Definition 1） and geotechnical parameters of a, k （Definition 2） in safety factors. The influence of different definitions on the calculatior with strength dual reduction finite element method（FEM）. It is shown in two kinds of definitions while the reduction rates of strength pa parameters（a, k） are in same proportion. The different D-P yield criteria and k. If circumcircle D-P yield criterion is adapted, the safety factors the ones with Definition 2 on all kinds of soil slope. And if D-P yield and criteria of homalographic circle are adapted, the safety factors are , those with Definition 1 for clay slope and much lower for landslide zon strength parameters of c equili lope brium analysis with safety factors is safety factors are （c tanφ） and geo lated to the in ition 1 are the plane ana diff tanφ dual lyzed erent technical parameters of a approximate to strain matching lower with Definition 2 than p with rough broken stone.