注浆加固黄土冲沟虚填段路基变形及稳定性分析  

Analysis of Deformation and Stability of Loess Gully Filling Section Subgrade Reinforced by Grouting

作　　者：贾静静 Jia Jingjing(Shanxi Xieli Highway Engineering Supervision Co.,Ltd.,Jinzhong 030600,China)

机构地区：[1]山西协力公路工程监理有限公司,山西晋中030600

出　　处：《市政技术》2024年第2期62-67,共6页Journal of Municipal Technology

摘　　要：以山西省某高速公路不良路基加固工程为例,在分析其路基病害产生原因的基础上,采用水泥-黄土浆液注浆加固与灰土挤密桩法进行了病害综合处理,通过现场试验和数值模拟相结合的方法确定了病害处理技术参数,分析了注浆加固后路基的变形及稳定性,并通过长期监测评价路基注浆加固后的效果。分析结果表明:注浆加固后土体的极限荷载为358kPa,变形模量为25.38MPa;路基表面沉降最大值为84.6mm,坡脚水平位移最大值为4.13mm,坡脚沉降最大值为12.56mm,路基边坡安全稳定性系数为1.746;路基表面累计沉降最大值为65mm,差异沉降最大值为12mm,均满足规范要求,加固效果显著。研究结果可为今后路基病害的预防与处理提供一定参考。The reinforcement of diseases subgrade of a highway in Shanxi Province was taken as an example.Based on the analysis of subgrade diseases cause,the disease was treated by cement-loess grout grouting and ash soil extrusion pile method.Through the combination of field test and numerical simulation,the technical parameters of treatment were determined.The deformation and stability of the subgrade after reinforcement were analyzed,and the reinforcement effect was evaluated by long-term monitoring.The results show that the ultimate load of the reinforced soil is 358 kPa,the deformation modulus is 25.38 MPa;The maximum settlement of the subgrade surface is 84.6 mm,the maximum horizontal displacement of the slope foot is 4.13 mm,the maximum settlement of the slope foot is 12.56 mm,and the safety factor of the slope stability is 1.746;The maximum cumulative settlement value is 65 mm and the maximum differential settlement one is 12 mm.All meet the requirements and the reinforcement effect is obvious.The research results can provide certain reference for the prevention and treatment of subgrade disease in future.

关 键 词：路基 注浆加固 虚填段 变形 稳定性 病害处理 

分 类 号：U419.4[交通运输工程—道路与铁道工程]