格宾网加筋煤矸石路堤稳定性及其强化措施  

Stability and Strengthening Measure of Coal Gangue Embankment Reinforced by Gabion

作　　者：沈华 张梓振 段君义 SHEN Hua;ZHANG Zi-zhen;DUAN Jun-yi(Yunnan Highway Construction Supervision Co.,Ltd.,Kunming 650041,China;School of Civil Engineering,Central South University,Changsha 410075,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]云南公路建设监理有限公司,昆明650041 [2]中南大学土木工程学院,长沙410075 [3]南昌大学工程建设学院,南昌330031

出　　处：《科学技术与工程》2022年第36期16196-16202,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51778641,52208348)。

摘　　要：煤矸石是煤炭开采加工等工业过程中形成的煤炭矿渣,由于其工业价值低而被作为废弃物。考虑到煤矸石矿区公路路基填料缺乏和遵循变废为宝的环保理念,某高速公路建设工程采用煤矸石填筑路基,并采用格宾网加筋土结构形式。为研究格宾网加筋煤矸石路基的工作性能,通过现场试验研究某高速公路格宾网加筋煤矸石路堤的力学与变形特性;建立相应的三维数值模型,分析格宾网加筋煤矸石路堤的稳定性及其加固强化措施。结果表明:在退台式格宾网箱墙面的卸荷作用和格宾网网兜效应共同作用下,墙面附近的竖向土压力较低;格宾网加筋挡墙是一种柔性结构,其墙后侧向土压力小于静止土压力;提出了在坡脚下方埋设格宾网箱的加固强化措施,该措施可通过改变坡脚下方土体的力学与变形状态以及潜在滑裂面的形状,来增大路堤的抗滑力,进而提高格宾网加筋路堤的稳定性。Coal gangue is the coal slag formed in the industrial process of coal mining and processing,which is regarded as waste because of its low industrial value.Considering the lack of roadbed fillers in the coal gangue mining area and following the environmental protection concept of turning waste into treasure,coal gangue was used to fill the roadbed in an expressway construction project,and the gabion reinforced soil structure was adopted.In order to study the working performance of gabion reinforced coal gangue embankment,the mechanical and deformation characteristics of an expressway gabion reinforced coal gangue embankment were studied through field tests.A corresponding three-dimensional numerical model was established to analyze the stability of the gabion reinforced coal gangue embankment and its reinforcement measures.The results show that the vertical earth pressure near the wall face is lower under the combined action of the unloading effect of the retreating gabion cage and the pocket effect of the gabion.Gabion reinforced retaining wall is a flexible structure.The lateral earth pressure behind the wall is less than the static earth pressure.The reinforcement measure of burying gabion cages under the slope toe was proposed.This measure can increase the anti-sliding force of the embankment by changing the mechanics and deformation state of the soil under the slope toe and the shape of the potential sliding surface,thereby improving the stability of the gabion reinforced embankment.

关 键 词：煤矸石 格宾网 加筋路堤 潜在滑裂面 强化措施 

分 类 号：U416[交通运输工程—道路与铁道工程]