注浆加筋减载涵洞土压力和内力的数值分析  

Numerical analysis of the earth pressures and internal forces of the culvert with surrounding grouting and reinforcement

作　　者：马强[1] 李丽华[1] 肖衡林[1] 

机构地区：[1]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《水利水电科技进展》2015年第3期37-41,共5页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51208187);教育部新世纪优秀人才支持计划(NCET-11-0962);黄土地区公路建设与养护技术交通行业重点实验室开放课题(KLTLR-Y12-11)

摘　　要：为降低高填方涵洞所受荷载及涵体内力,提出了涵洞注浆加筋减载方法。采用有限元数值模拟计算了仅注浆加固和注浆加固结合加筋减载后的涵顶土压力和拱圈内力,对涵洞两侧不同范围注浆加固时的减载效果进行对比分析。通过参数分析,研究了格栅刚度及注浆区模量对涵顶土压力及拱圈内力的影响。结果表明,涵墙外注浆加固范围可取1/2涵洞宽度;在注浆加固区顶部铺设土工格栅能进一步降低涵顶土压力和拱圈内力;增大格栅刚度对提高减载效果作用很小;注浆区模量对涵顶土压力和拱圈内力有较大影响,当注浆区模量接近100 MPa时,涵顶土压力和拱圈内力达到较小值,进一步提高注浆区模量,涵顶土压力和拱圈内力减小并不明显。The load reducing method of the culvert with surrounding grouting and reinforcement is introduced to reduce the earth pressures and internal forces of highway culverts under high fills. Earth pressures and internal forces of the culvert with grouting and grouting covered with reinforcement are calculated by numerical simulations using finite element method, and the load reducing effects with different lateral grouting areas are compared. Additionally, the effects of geogrid stiffness, and the modulus of grouting on the earth pressures as well as internal forces of culvert are studied on the basis of parameter analysis. The results show that the grouting width surrounding the culvert wall is half of the culvert width, while the installation of geogrid reinforcement on the top of grouting area can further reduce earth pressures and internal forces. The increase of the geogrid stiffness makes very little effect on load reduction and the modulus in grouting area has a massive impact on earth pressures and internal forces. When the modulus is close to 100 MPa, earth pressures and internal forces reach at the lower values, which insignificantly decline as the increase of modulus.

关 键 词：涵洞 土压力 涵体内力 减载效果 数值模拟 

分 类 号：U449[建筑科学—桥梁与隧道工程]