考虑地下水位及复杂坡形的边坡有限元建模改进  

Improvement of Finite Element Modeling of Slope Considering Groundwater Level and Complex Slope Shape

作　　者：葛书磊 李萍[1,3] 鲁博[2] 曹博 秦二乐 Ge Shulei;Li Ping;Lu Bo;Cao Bo;Qin Erle(School of Geological Engineering and Surveying,Chang'an University,Xi'an 710054,China;Northwest Survey and Design Institute of China Power Construction Group,Xi'an 710065,China;Water Cycle and Geological Environment Observation and Research Station for the Chinese Loess Plateau,Ministry of Education,Zhengning 745339,China)

机构地区：[1]长安大学地质工程与测绘学院,陕西西安710054 [2]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [3]黄土高原水循环与地质坏境教育部野外科学观测研究站,甘肃正宁745339

出　　处：《甘肃科学学报》2021年第2期85-92,共8页Journal of Gansu Sciences

基　　金：国家自然科学基金资助项目(41877242);中央高校基本科研业务费专项资金(300102260507)。

摘　　要：边坡外水位变动导致坡内地下水位升降,可能诱发边坡失稳。地下水位变动使得有限元建模过程中网格划分复杂化,边坡坡面的复杂形状使边坡破坏机理复杂化。研究在已有有限元程序基础之上加入了复杂坡面和地下水位变动条件下网格重新划分的内容,使得改进的有限元程序可快速计算水位变动条件下的边坡稳定系数。以极限平衡法的计算结果作为参照,对改进的程序进行检验,发现极限平衡法的稳定系数计算结果和程序的计算结果相近,证明了程序的可靠性。以白鹿塬地区的报恩寺古滑坡为例,用改进的程序对其在水位变动条件下的稳定系数进行计算,发现报恩寺古滑坡在水位变动时整体稳定性高,仅可能发生局部坍塌,且塌方量小,对建筑影响很小。The fluctuation of the water level outside the slope causes the rise and fall of the groundwater level inside the slope,which may induce slope instability.The variation of groundwater level complicates the grid division in the finite element modeling process,and the complex shape of slope complicates the failure mechanism of slope.Based on the existing finite element program,the content of grid generation under the condition of complex slope and groundwater level change is added in this paper,which makes the improved finite element program can quickly calculate the stability coefficient under the conditions of water level fluctuation.Taking the calculation results of limit equilibrium method as reference,the improved program in the paper is checked.It is found that the calculation results of stability coefficient of limit equilibrium method are close to those of the program,which proves the reliability of the calculation results of the program.Taking the Bao'en Temple ancient landslide in Bailuyuan area as an example,the stability coefficient of Bao'en Temple ancient landslide under the condition of water level change is calculated by the improved program in the study.It is found that the overall stability of Bao'en Temple ancient landslide is high when the water level changes,only partial collapse may occur,and the amount of collapse is small,which has little impact on the Bao'en Temple.

关 键 词：复杂坡形 水位变动 有限元程序 稳定系数 

分 类 号：TU43[建筑科学—岩土工程]