紧邻地铁高架桥桩基础的深基坑变形控制研究
|
摘要
以深圳地铁4号线为例,通过理论分析和有限元计算,探讨了地铁高架桥桩基础与深基坑紧邻条件下支护结构与高架桩基础的变形控制指标。数值计算结果对比实际监测值表明,随着基坑开挖深度的增加,支护结构和高架桥桩基础的水平位移都逐渐增大,在开挖至基坑底时变形基本上达到最大值,并且计算值与实际监测值变化规律基本一致,数值计算能基本反应出各工况下基坑支护结构和高架桥桩基础的变形趋势。主要监测结果表明,本工程中采用的增大支护桩桩径、适当减小桩间距、增加支护桩嵌固深度以及设置双重止水帷幕等变形控制措施,有效控制了基坑支护结构和高架桥基础的变形,有保证障了地铁的安全运行。
Based on line 4 of Shenzhen metro,through theoretical analysis and finite element calculation,the deformation control index of the elevated bridge pile foundation and supporting structure are discussed. Comparing the computing result and actual monitoring value show that both the deformation of the elevated bridge pile foundation and supporting structure grows with when the excavation depth grows,and the deformation reach the limit when excavate to the bottom of the pit. The transformation laws of the deformation are basically the same. The numerical computation can reflect the deformation trend of the elevated bridge pile foundation and supporting structure. The monitoring results show that deformation is effective controlled by increasing pile diameter,reducing the pile spacing,increasing the embedded depth of the pile,setting double waterproof curtain. The control measures insured the safety of the metro operation.
Based on line 4 of Shenzhen metro,through theoretical analysis and finite element calculation,the deformation control index of the elevated bridge pile foundation and supporting structure are discussed. Comparing the computing result and actual monitoring value show that both the deformation of the elevated bridge pile foundation and supporting structure grows with when the excavation depth grows,and the deformation reach the limit when excavate to the bottom of the pit. The transformation laws of the deformation are basically the same. The numerical computation can reflect the deformation trend of the elevated bridge pile foundation and supporting structure. The monitoring results show that deformation is effective controlled by increasing pile diameter,reducing the pile spacing,increasing the embedded depth of the pile,setting double waterproof curtain. The control measures insured the safety of the metro operation.
引文
[1]郑刚,李志伟.基坑开挖对邻近任意角度建筑物影响的有限元分析[J].岩土工程学报,2012,34(4):615-624.
[2]左殿军,史林,李铭铭,等.深基坑开挖对邻近地铁隧道影响数值计算分析[J].岩土工程学报,2014,36(S2):391-395.
[3]蔡武林.深基坑开挖对临近地铁车站及区间影响的数值模拟分析[J].水利与建筑工程学报,2016,14(6):222-226.
[4]李琳,宋静,张建新,等.多支撑基坑开挖对邻近桩基影响的三维数值研究[J].防灾减灾工程学报,2017,37(5)782-789.
[5]王升.深基坑施工对邻近高铁桥梁影响研究[J].铁道建筑,2014(9):102-104.
[6]王军.深基坑开挖对邻近高铁桥墩的影响分析[J].铁道勘察,2010,4(9):77-79.
[7]郭全元.基坑开挖对临近城际铁路高架桥墩的影响分析[J].铁道建筑技术,2017(10):1-7.
[8]吴薪柳.复杂基坑施工对相邻地铁车站沉降的影响分析[J].铁道工程学报,2017(2):93-97.
[9]张子新,李佳宇,周湘,等.近距离开挖卸荷条件下运营地铁高架桥墩响应研究[J].岩土力学,2015,36(12):3531-3539.
[10]CASPE M S. Surface Settlement Adjacent to Braced Open Cuts[J]. Journal of Soil Mechanics&Foundations Division,1966,92(4):51-59.
[11]丁勇春,王建华.深基坑施工对高架基础的变形影响及控制研究[J].土木工程学报,2012,45(7):155-161.
[12]深圳地铁集团.深圳市地铁集团有限公司地铁运营安全保护区和建设规划控制区工程管理办法[R].深圳:2016.
[2]左殿军,史林,李铭铭,等.深基坑开挖对邻近地铁隧道影响数值计算分析[J].岩土工程学报,2014,36(S2):391-395.
[3]蔡武林.深基坑开挖对临近地铁车站及区间影响的数值模拟分析[J].水利与建筑工程学报,2016,14(6):222-226.
[4]李琳,宋静,张建新,等.多支撑基坑开挖对邻近桩基影响的三维数值研究[J].防灾减灾工程学报,2017,37(5)782-789.
[5]王升.深基坑施工对邻近高铁桥梁影响研究[J].铁道建筑,2014(9):102-104.
[6]王军.深基坑开挖对邻近高铁桥墩的影响分析[J].铁道勘察,2010,4(9):77-79.
[7]郭全元.基坑开挖对临近城际铁路高架桥墩的影响分析[J].铁道建筑技术,2017(10):1-7.
[8]吴薪柳.复杂基坑施工对相邻地铁车站沉降的影响分析[J].铁道工程学报,2017(2):93-97.
[9]张子新,李佳宇,周湘,等.近距离开挖卸荷条件下运营地铁高架桥墩响应研究[J].岩土力学,2015,36(12):3531-3539.
[10]CASPE M S. Surface Settlement Adjacent to Braced Open Cuts[J]. Journal of Soil Mechanics&Foundations Division,1966,92(4):51-59.
[11]丁勇春,王建华.深基坑施工对高架基础的变形影响及控制研究[J].土木工程学报,2012,45(7):155-161.
[12]深圳地铁集团.深圳市地铁集团有限公司地铁运营安全保护区和建设规划控制区工程管理办法[R].深圳:2016.