滨海软土地层邻近高铁桥的深基坑支护结构力学性状及对环境的影响
姚志雄1,2方佳斌1蔡亦来2缪扬扬2吴波3吉磊1
YAO Zhixiong1,2FANG Jiabin1CAI Yilai2MIAO Yangyang2WU Bo3JI Lei1
-
作者信息:1.福建理工大学地下工程福建省高校重点实验室， 350118， 福州
2.福建省交通科研院有限公司， 350002， 福州
3.东华理工大学土木与建筑工程学院， 330013， 南昌
-
Affiliation:1.Key Laboratory of Underground Engineering, Fujian University of Technology, 350118, Fuzhou, China
2.Fujian Fujian Province Traffic Academy Co., Ltd., 350002, Fuzhou, China
3.School of Civil and Architectural Engineering, East China University of Technology, 330013, Nanchang, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007－869x.20231077
-
中图分类号/CLCN:TU753
-
栏目/Col:土建工程
摘要:
［目的］在高铁桥跨越的河道中进行深基坑施工，必须探明河道基坑施工对邻近高铁桥的影响并评价其安全性，故有必要开展相关研究。［方法］依托福建滨海区邻近高铁桥的软土河道深基坑工程开展SMW(型钢水泥土搅拌(桩)墙)法支护结构承载变形特性研究。综合考虑支护刚度优化原则、结构及环境变形控制要求，提出邻近高铁桥敏感段基坑支护方案并通过试验段实测验证其合理性。［结果及结论］SMW法桩施工对土体轻微扰动产生的地层压力使得支护水平位移沿桩身呈中部大两头小的“弓”形；随基坑开挖，支护水平位移曲线沿桩身从“弓”形逐渐过渡至“反弓”形，最大位移从桩身转移至桩顶，桩底处出现“踢脚”现象，支护变形在U型槽施作后趋于稳定。研究表明，坑周3.0H(H为基坑深度)范围为变形影响区，坑周17H范围为变形影响关键区，坑周3 m处沉降达到最大值。邻近高铁框架桥墙体、地面沉降值均远小于规定值，验证了计算方法及方案的合理性。
Abstracts:
［Objective］ When undertaking deep excavation construction within a river channel spanned by a high-speed railway bridge, the impact of river channel foundation pit construction on the adjacent high-speed railway bridge should be explored and its safety be evaluated. Therefore, it is necessary to carry out relevant researches. ［Method］ Based on a certain deep excavation project in soft soil river channel near high-speed railway bridge in Binhai District, Fujian Province, a research is carried out focusing on the load-bearing and deformation characteristics of SMW (soil mixing wall) method support structures. Taking into account the principle of support stiffness optimization, and requirements of structural and environmental deformation control, a foundation pit support scheme for the sensitive section near high-speed railway bridge is proposed and its rationality is verified through the trial section. ［Result & Conclusion］ The slight disturbance of the soil with SMW pile construction method causes strata pressure, making the horizontal displacement of the support structure show a bow trend along the pile body, large in the middle and small at both ends. With the excavation of the foundation pit, the horizontal displacement curve of the support gradually transitions from the bow shape to a reverse bow shape along the pile body, the maximum displacement is transferred from the pile body to the pile top, and a "kicking" phenomenon occurs at the pile bottom. The support deformation tends to be stable after the U-shaped groove is constructed. Research shows that the range of 3.0H (H is the foundation pit depth) around the pit is the deformation influence area, the range of 1.7H around the pit is the key deformation influence area, and the settlement reaches the maximum value at 3 m around the pit. The settlement values of the wall and ground near the high-speed railway frame bridge are far less than the specified values, verifying the rationality of the calculation method and scheme.
过刊浏览
资料下载
友情链接