土工格栅增强填石路堤稳定性的作用机理及其应用  

Mechanism of Geogrid in Reinforcing the Stability of Rock-filled Embankment and Its Application

作　　者：杨成忠[1] 杨平[1] 张开顺 余斌 

机构地区：[1]南京林业大学,南京210037 [2]中铁十一局集团第五工程有限公司

出　　处：《东北林业大学学报》2008年第6期65-67,共3页Journal of Northeast Forestry University

基　　金：江西省科技厅科研基金项目(0636001000475)

摘　　要：干沟填石路堤最大中心填筑高度为64.375m,最大边坡填筑高度达72.144m,在水压力存在条件下其整体稳定性不足,工程中采取了排水与土工格栅加固的处理措施提高稳定性。基于摩尔库仑强度准则,分析认为布置在填石材料中的土工格栅通过侧向约束提高填石材料的抗剪强度,从而使填石路堤的整体稳定性提高。基于极限平衡理论和Ordinary方法,考虑该处填石路堤在高水位条件下布置土工格栅和不布置土工格栅2种工况,应用Geo-slope软件计算了该高填石路堤稳定性安全系数。计算结果表明:填石路堤在高水位时布设了土工格栅后稳定安全系数为由0.921上升到1.344,比不布设土工格栅时提高45.92%,此时安全系数满足有关规范的要求。因此,土工格栅是增强高填石路堤稳定性的一项有效措施。The highest filling high at mid of Gangou rock-filled embankment is 64.375 m with a highest filling high 72.14 m at side slope. The stability cannot meet the standard under water pressure exists. Therefore, drainage and geogrid are applied at the same time to ensure the stability. Based on Mohr-Coulomb strength criterion, it is thought that the paved geogrid strengthens the shearing strength of rockfill material by side restricting to increase the stability of rock-filled embankment. Based on limiting equilibrium theory and Ordinary method, considering two working conditions （paved geogrid and unpaved geogrid ）, the stability safety factor of rock-filled embankment was calculated with Geo-slope software. Result showed that the safety factor raised from 0.921 to 1. 344, displaying an increase by 45.92% under high water level after geogrid was paved in rockfill material compared with unpaved geogrid. The safety factor can meet the standard.

关 键 词：高填石路堤 稳定性 土工格栅 摩尔库仑强度准则 Ordinary法 极限平衡理论 安全系数 

分 类 号：TU502.3[建筑科学—建筑技术科学]