丰宁抽水蓄能电站拦沙坝坝基振冲碎石桩加固技术
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摘要
丰宁抽水蓄能电站拦沙坝坝基为淤泥质粉土地基,土体力学性质较差,土质不均匀,且存在液化问题,地基承载力仅为80kPa,作为拦沙坝坝基不能满足大坝稳定性、承载力及抗震等要求。为此设计采用振冲碎石桩处理坝基,以改善坝基的工程特性。本文详细介绍了工程试桩阶段、施工阶段存在问题以及施工工艺和质量控制方法。工后检测结果表明,按照该施工工艺和质量控制方法,有效保证了工程质量,提高了施工功效,解决了坝基承载力不足、高压缩性、易液化的问题,可作为同类工程参考。
The sediment storage dam of Fengning pumped storage power station is built on silt soil foundation which has poor mechanical properties of uneven soil quality and liquefaction. Thus the bearing capacity of the foundation is only 80 kPa. It cannot meet the requirements of the stability,the bearing capacity and the seismic resistance of the sediment storage dam. To solve above problems,vibro-replacement stone column is utilized to reinforce the foundation. Based on the filed practice,the engineering problems are described in the process of the construction of the vibro-replacement stone columns,and the corresponding quality control measures and managerial experience are proposed. The post-construction test shows that the presented quality control methods can effectively improve the construction quality and efficiency,and solve the problems of lack of bearing capacity, high compressibility and easy liquefaction of the foundation. It can be beneficial for the similar engineering project.
The sediment storage dam of Fengning pumped storage power station is built on silt soil foundation which has poor mechanical properties of uneven soil quality and liquefaction. Thus the bearing capacity of the foundation is only 80 kPa. It cannot meet the requirements of the stability,the bearing capacity and the seismic resistance of the sediment storage dam. To solve above problems,vibro-replacement stone column is utilized to reinforce the foundation. Based on the filed practice,the engineering problems are described in the process of the construction of the vibro-replacement stone columns,and the corresponding quality control measures and managerial experience are proposed. The post-construction test shows that the presented quality control methods can effectively improve the construction quality and efficiency,and solve the problems of lack of bearing capacity, high compressibility and easy liquefaction of the foundation. It can be beneficial for the similar engineering project.
引文
[1]卢靖.振冲法地基处理技术与实践[M].北京:中国水利水电出版社,2014.
[2]张爱军.复合地基优化的理论与措施研究[D].西安:西安理工大学,2007.
[3]李庆跃,李晓力,肖普.重型动力触探在振冲施工质量控制及检测中的应用[J].探矿工程(岩土钻掘工程),2013(2):74-76.
[4]李晓力,李庆跃,卢伟.振冲法地基处理技术在鲁基厂水电站工程中的应用[C]//中国水利学会地基与基础工程专业委员会第12次全国学术会议. 2013:83-87.
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[6]李晓力,张芳芑. 75kW与30kW振冲器加固地基对比试验分析[J].西部探矿工程,2003,15(4):20-22.
[7]何广讷.振冲碎石桩复合地基[M].北京:人民交通出版社,2012.
[8]张伟.碎石桩复合地基加固优化的模型试验和数值模拟[D].杨凌:西北农林科技大学,2015.
[9]马永峰,周丁恒,张志豪,等.大型石化地基振冲碎石桩处理现场试验研究[C]//中国土木工程学会全国土力学及岩土工程学术大会. 2015.
[2]张爱军.复合地基优化的理论与措施研究[D].西安:西安理工大学,2007.
[3]李庆跃,李晓力,肖普.重型动力触探在振冲施工质量控制及检测中的应用[J].探矿工程(岩土钻掘工程),2013(2):74-76.
[4]李晓力,李庆跃,卢伟.振冲法地基处理技术在鲁基厂水电站工程中的应用[C]//中国水利学会地基与基础工程专业委员会第12次全国学术会议. 2013:83-87.
[5]宋红英,李晓力.仁宗海水电站堆石坝坝基加固处理试验[J].水力发电,2006,32(9):34-36.
[6]李晓力,张芳芑. 75kW与30kW振冲器加固地基对比试验分析[J].西部探矿工程,2003,15(4):20-22.
[7]何广讷.振冲碎石桩复合地基[M].北京:人民交通出版社,2012.
[8]张伟.碎石桩复合地基加固优化的模型试验和数值模拟[D].杨凌:西北农林科技大学,2015.
[9]马永峰,周丁恒,张志豪,等.大型石化地基振冲碎石桩处理现场试验研究[C]//中国土木工程学会全国土力学及岩土工程学术大会. 2015.