土岩溶组合地区可控刚度桩筏基础设计
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摘要
在土岩溶组合地层的高层建筑设计中,由于地基土支承刚度不均匀,导致建筑物基础的承载力不足或不均匀沉降较大,常规设计方法无法保证建筑物安全。以典型工程为例,详细论述桩筏基础主动控制技术应用于该项目的设计计算过程,并通过有限元模型与现场监测数据验证其合理性与可靠性。该工程在黏土分布区采用桩侧和桩端后注浆摩擦桩,在基岩区域通过削弱基岩支承刚度,采用在桩顶设置刚度调节装置的桩(墩)基础,保证了黏土分布区支承刚度与基岩区支承刚度相匹配,满足承载力的同时有效地控制了基础的差异沉降。同时数值计算结果也表明,此工程基础设计方案是合理的,实测结果显示建筑物的不均匀沉降和总体沉降量均较小,验证了在桩顶设置刚度调节装置在土岩溶复杂地质条件下的适应性,取得了显著的经济效益。
In the design of high-rise building in soil-Karst composite area, the foundation soil bearing stiffness is not uniform, which often leads to weak bearing capacity or larger uneven settlement. The conventional design method cannot guarantee the safety of buildings. A typical project was used as an example to describe the design and calculation process of the application of active control technology of pile raft foundation. The rationality and reliability of the application were verified through the field monitoring data and finite element analysis. This project used the friction pile with grouting technique of lateral and tip in the clay area. The supporting stiffness of the clay region was matched with the supporting stiffness of the bedrock area by weakening the support stiffness of the bedrock area and setting the stiffness adjustment device on the top of pile by pier foundation. All these effectively controlled the differential settlement of the foundation and satisfied the requirement of bearing capacity.Meanwhile numerical results show the rationality of the design scheme and the measured results show that the uneven settlement and the total settlement of the building are small, which verify that the stiffness adjustment device on the top of pile is adaptable to the complex geological condition of Karst region and remarkable economic benefit has been obtained.
In the design of high-rise building in soil-Karst composite area, the foundation soil bearing stiffness is not uniform, which often leads to weak bearing capacity or larger uneven settlement. The conventional design method cannot guarantee the safety of buildings. A typical project was used as an example to describe the design and calculation process of the application of active control technology of pile raft foundation. The rationality and reliability of the application were verified through the field monitoring data and finite element analysis. This project used the friction pile with grouting technique of lateral and tip in the clay area. The supporting stiffness of the clay region was matched with the supporting stiffness of the bedrock area by weakening the support stiffness of the bedrock area and setting the stiffness adjustment device on the top of pile by pier foundation. All these effectively controlled the differential settlement of the foundation and satisfied the requirement of bearing capacity.Meanwhile numerical results show the rationality of the design scheme and the measured results show that the uneven settlement and the total settlement of the building are small, which verify that the stiffness adjustment device on the top of pile is adaptable to the complex geological condition of Karst region and remarkable economic benefit has been obtained.
引文
[1] 杨光华,李思平,杜秀忠,等. 岩溶地区高层建筑筏板基础的实践[J]. 岩石力学与工程学报,2006,25(S2):3363-3371.
[2] POULOS HARRY G,SMALL JOHN C,CHOW HELEN. Foundation design for high-rise tower in Karstic ground[J]Geotechnical Special Publication, 2013(229):720-731.
[3] CHAN STEVE H M, LAIK W. The geological characteristics of buried karst and its impact on foundations in Hong Kong, China[C]//10th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. San Antonio, 2005.
[4] 阚敦莉,方云飞. 唐山岩溶地区某超高层建筑桩筏设计与协同作用分析[J]. 建筑结构,2014,44(20):115-118.
[5] 宰金珉,周峰,梅国雄,等. 端承桩复合桩基及其设计方法[J]. 工业建筑, 2008, 38(1): 60-64, 73.
[6] 周峰,郭亮,刘壮志,等. 位移调节器用于端承型桩筏基础的模型试验研究[J]. 岩土工程学报,2012,31(2):373-378,444.
[7] 朱锐,周峰,翟德志,等.可控刚度桩筏基础变刚度调平的工程实践[J].建筑科学,2018,34(7):139-146.
[8] 周峰,宰金珉, 梅国雄,等. 桩土刚度调节装置的研制与应用[J]. 建筑结构, 2009, 39(7): 40-42.
[9] ZHOU F, LIN C, ZHANG F, et al. Design and field monitoring of piled raft foundations with deformation adjustors[J]. Journal of Performance of Constructed Facilities,2016,30(6):04016057. DOI:10.1061/(ASCE)CF.1943-5509.0000917.
[10] ZHOU F,LIN C,WANG X D,et al. Application of deformation adjustors in piled raft foundations[J]. Proceedings of the Institution of Civil Engineers, 2016,169(6): 527-540.
[11] 周峰,朱锐,郭天祥,等.可控刚度桩筏基础桩土共同作用的工程实践[J].岩石力学与工程学报,2017,36(12):3075-3084.
[12] 基桩静载试验自平衡法:JT/T 738—2009[S]. 北京: 人民交通出版社, 2009.
[13] 建筑桩基技术规范:JGJ 94—94[S].北京:中国建筑工业出版社,1995.
[2] POULOS HARRY G,SMALL JOHN C,CHOW HELEN. Foundation design for high-rise tower in Karstic ground[J]Geotechnical Special Publication, 2013(229):720-731.
[3] CHAN STEVE H M, LAIK W. The geological characteristics of buried karst and its impact on foundations in Hong Kong, China[C]//10th Multidisciplinary Conference on Sinkholes and the Engineering and Environmental Impacts of Karst. San Antonio, 2005.
[4] 阚敦莉,方云飞. 唐山岩溶地区某超高层建筑桩筏设计与协同作用分析[J]. 建筑结构,2014,44(20):115-118.
[5] 宰金珉,周峰,梅国雄,等. 端承桩复合桩基及其设计方法[J]. 工业建筑, 2008, 38(1): 60-64, 73.
[6] 周峰,郭亮,刘壮志,等. 位移调节器用于端承型桩筏基础的模型试验研究[J]. 岩土工程学报,2012,31(2):373-378,444.
[7] 朱锐,周峰,翟德志,等.可控刚度桩筏基础变刚度调平的工程实践[J].建筑科学,2018,34(7):139-146.
[8] 周峰,宰金珉, 梅国雄,等. 桩土刚度调节装置的研制与应用[J]. 建筑结构, 2009, 39(7): 40-42.
[9] ZHOU F, LIN C, ZHANG F, et al. Design and field monitoring of piled raft foundations with deformation adjustors[J]. Journal of Performance of Constructed Facilities,2016,30(6):04016057. DOI:10.1061/(ASCE)CF.1943-5509.0000917.
[10] ZHOU F,LIN C,WANG X D,et al. Application of deformation adjustors in piled raft foundations[J]. Proceedings of the Institution of Civil Engineers, 2016,169(6): 527-540.
[11] 周峰,朱锐,郭天祥,等.可控刚度桩筏基础桩土共同作用的工程实践[J].岩石力学与工程学报,2017,36(12):3075-3084.
[12] 基桩静载试验自平衡法:JT/T 738—2009[S]. 北京: 人民交通出版社, 2009.
[13] 建筑桩基技术规范:JGJ 94—94[S].北京:中国建筑工业出版社,1995.
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