基坑监测技术的研究与应用
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摘要
基坑工程是地下工程施工中内容丰富且富有变化的领域,是土木工程中最为复杂的技术领域之一。它是集地质工程和结构工程等多学科于一体的系统工程,具有强烈的地域性、综合性、实践性和风险性。如何有效地控制基坑变形,使基坑工程既安全又经济,是人们一直探索的课题。
论文首先对降水、围护桩施工、土方开挖、止水帷幕等四个因素对周边环境的影响和基坑开挖引起的土体变形现象进行了深入分析,指出基坑开挖具有一定的时空效应。
接着对基坑监测方案设计的各个方面进行了较详细的论述并提出了自己的看法,指出在基坑监测中应根据基坑的实际情况多方面考虑后选取合适的监测项目及监测报警临界值,并采用多种数学方法对监测数据进行分析与评价,以便更好的指导工程施工。
最后根据上述研究成果,对广州市珠江新城一基坑项目设计了监测方案,并对监测数据进行了分析与评价,为该基坑的安全施工提供了可靠的保障。
Foundation pit engineering is a rich and various field in underground engineering construction, which is also the most complicated technique filed in civil engineering. Foundation pit engineering is the systematic engineering with the geology engineering and structure engineering in it, whose characteristic includes the severe regionality, comprehensibility, practicality and risky character. It is a subject many people have studied that how to control the deformation of the foundation pit, to make the foundation safe with low cost.
It is analyzed in the present paper that the effect of the factors of precipitation, retaining pile, soil excavation, and waterproof curtain to the surrounding environment and deformation of soil due to the foundation excavation. The analysis points out that there exist the time and space effect during the foundation excavation.
The detail analysis are done to the monitoring schemes of the foundation pit, and the authors' perceptions are presented, pointing out that the appropriate monitoring schemes and monitoring warning value should be chosen according to the real situation of the foundation. Then the analysis and estimation for the monitoring data of the foundation pit can be done by some mathematical method, which will give some guidance for the construction of engineering.
In final stage, the monitoring scheme for the foundation pit project in Guangzhou Zhujiang new city is presented according to the above study results, the analysis and estimation are done to the monitoring data, which can give the guarantee for the safety construction of the foundation pit.
论文首先对降水、围护桩施工、土方开挖、止水帷幕等四个因素对周边环境的影响和基坑开挖引起的土体变形现象进行了深入分析,指出基坑开挖具有一定的时空效应。
接着对基坑监测方案设计的各个方面进行了较详细的论述并提出了自己的看法,指出在基坑监测中应根据基坑的实际情况多方面考虑后选取合适的监测项目及监测报警临界值,并采用多种数学方法对监测数据进行分析与评价,以便更好的指导工程施工。
最后根据上述研究成果,对广州市珠江新城一基坑项目设计了监测方案,并对监测数据进行了分析与评价,为该基坑的安全施工提供了可靠的保障。
Foundation pit engineering is a rich and various field in underground engineering construction, which is also the most complicated technique filed in civil engineering. Foundation pit engineering is the systematic engineering with the geology engineering and structure engineering in it, whose characteristic includes the severe regionality, comprehensibility, practicality and risky character. It is a subject many people have studied that how to control the deformation of the foundation pit, to make the foundation safe with low cost.
It is analyzed in the present paper that the effect of the factors of precipitation, retaining pile, soil excavation, and waterproof curtain to the surrounding environment and deformation of soil due to the foundation excavation. The analysis points out that there exist the time and space effect during the foundation excavation.
The detail analysis are done to the monitoring schemes of the foundation pit, and the authors' perceptions are presented, pointing out that the appropriate monitoring schemes and monitoring warning value should be chosen according to the real situation of the foundation. Then the analysis and estimation for the monitoring data of the foundation pit can be done by some mathematical method, which will give some guidance for the construction of engineering.
In final stage, the monitoring scheme for the foundation pit project in Guangzhou Zhujiang new city is presented according to the above study results, the analysis and estimation are done to the monitoring data, which can give the guarantee for the safety construction of the foundation pit.
引文
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[15]张维正.密集建筑群中的深基坑施工技术[J].探矿工程,2006(6)：1-3
[16]李秋.激光三维扫描技术在矿区地表沉陷监测中的应用研究[J].煤炭工程,2006(4)：97-99
[17]黄秋林等.深基坑变形监测及数据处理[J].山西建筑,2005,31(1)：67-68
[18]姚黔贵.城市深基坑变形监测的实施[J].贵州工业大学学报,2005,34(2)：96-99
[19]任丽芳.深基坑工程安全监测和信息化监控[J].铁路职业技术学院学报,2006,5(2)：10-14
[20]潘洪科,饶运章.神经元网络在基坑工程变形预报中的应用研究[J].南方冶金学院学报,2000,21(4)：239-243
[2l]袁金荣,赵福勇.基坑变形预测的时间序列分析[J].土木工程学报,2001,34(6)：55-59
[22]晏成明,曹国金,沈辉.岩土锚固技术应用和研究现状及其展望[J].岩土工程师,2002,14(2)：14-18
[23]刘继国,曾亚武.FLAC3D在深基坑开挖与支护数值模拟中的应用[J].岩土力学,2006,27(3)：505-508.
[24]吴文,徐松林,汪大国..深基坑桩锚支护体系中的土锚试验研究[J].土工基础,2000,14(1)：27-30.
[25]P. M. Naghdi. A new derivation of the general equations of elastic shells [J]. International Journal of Engineering Science,1965,3 (3):335-337
[26]F.A.B. Danziger, B.R. Danziger, M.P. Pacheco. The simultaneous use of piles and prestressed anchors in foundation design [J]. Engineering Geology,2006,87 (3/4):163-177
[27]S. Narasimha Rao, K. Hema Latha, B. Pallavi, S. Surendran. Studies on pullout capacity of anchors in marine clays for mooring systems[J].Applied Ocean Research,2006,28(2):103-111
[28]Charles Aubeny, J. Donald Murff. Simplified limit solutions for the capacity of suction anchors under undrained conditions [J]. Ocean Engineering,2005,32 (7): 864-877
[29]Arching effects behind a soldier pile wall [J].Computers and Geotechnics,2001, 28 (6/7):379-396
[30]K. Ilamparuthi, E. A. Dickin. Predictions of the uplift response of model belled piles in geogrid-cell-reinforced sand [J]. Geotextiles and Geomembranes,2001, 19 (2):89-109
[31]Rollins Kyle M, Peterson Kris T, Weaver Thomas Z. Lateral load behavior of full-scale pile group in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering,1998,124(6):468-478
[32]时伟,刘继明,章伟.深基坑桩锚支护体系水平位移试验研究[J].岩石力学与工程学报,2003,22(s1)：2355-2358
[33]姜晨光,林新贤,黄家兴.深基坑桩锚支护结构变形监测与初步分析[J].岩土工程界,5(8)：55-56
[34]欧吉青.某深基坑桩锚支护体系计算方法与结果分析[J].南华大学学报(自然科学版),2007,21(3)：73-77
[35]许锡昌,葛修润.基于最小势能原理的桩锚支护结构空间变形分析[J].岩土力学,2006,27(5)：705-710
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