某近海软土地基真空联合堆载预压法工程实例分析
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摘要
文中基于真空—堆载联合预压法在某近海燃气电厂深厚软弱地基加固处理中的工程应用实例,对预压区域内真空度、土体孔隙水压力、土体深层水平位移、场内地表沉降、地下水位、深部土层分层沉降监测资料进行综合分析,对软基处理前后的室内试验和现场原位试验的数据进行了系统的对比和研究,结果表明:联合预压处理后,软土地基的沉降速率指标、固结度、承载力均能达到设计要求,软土各项物理力学性能得到了明显改良,地基承载力得到了大幅提高,加固效果良好。本案例为在近海地区具有相同或类似条件的软土地基加固处理采用真空—堆载联合预压法提供了技术支持和宝贵经验。
Based on the application of the vacuum-surcharge preloading method in soft foundation treatment of an offshore power plant,the in-situ monitoring data of vacuum degree,pore-water pressure,deep horizontal displacement,on-site ground settlement,ground water levels and settlement at different depth of the soft foundation reinforcement area are analyzed,and the data from the lab tests and the in-situ tests before and after the soft foundation treatment are studied and contrasted systematically. The study concludes that: after vacuum-surcharge preloading,the settlement rate index,the consolidation degree and the bearing capacity of the foundation meet the design requirements,all physical-mechanical indices of the soft soil are improved obviously,the bearing capacity of the foundation is greatly improved,and the reinforcement is effective. It provides the technical support and valuable experiences for vacuum-surcharge preloading method when it is used to treat soft soil with the same type or similar conditions in offshore construction.
Based on the application of the vacuum-surcharge preloading method in soft foundation treatment of an offshore power plant,the in-situ monitoring data of vacuum degree,pore-water pressure,deep horizontal displacement,on-site ground settlement,ground water levels and settlement at different depth of the soft foundation reinforcement area are analyzed,and the data from the lab tests and the in-situ tests before and after the soft foundation treatment are studied and contrasted systematically. The study concludes that: after vacuum-surcharge preloading,the settlement rate index,the consolidation degree and the bearing capacity of the foundation meet the design requirements,all physical-mechanical indices of the soft soil are improved obviously,the bearing capacity of the foundation is greatly improved,and the reinforcement is effective. It provides the technical support and valuable experiences for vacuum-surcharge preloading method when it is used to treat soft soil with the same type or similar conditions in offshore construction.
引文
[1]何忠意,杨雄.真空—堆载联合预压在横琴能源站地基处理中的应用[J].南华大学学报(自然科学版),2015,29(3):116~121,128.He Zhongyi,Yang Xiong. The application of vacuum-surcharge preloading method in foundation treatment of Hengqin power station[J]. Journal of University of South China(Science and Technology),2015,29(3):116~121,128.(in Chinese)
[2]张福海,陈雷,郭帅杰等.底部抽真空预压法砂井地基固结解析解[J].岩土力学,2014,35(10):2787~2793.Zhang Fuhai,Chen Lei,Guo Shuaijie et al. Analytical solution for consolidation of sand-drained foundation with bottom vacuum preloading method[J]. Rock and Soil Mechanics,2014,35(10):2787~2793.(in Chinese)
[3]龚晓南.地基处理技术发展与展望[M].北京:中国水利水电出版社,知识产权出版社,2004.Gong Xiaonan. Development and prospect of foundation treatment technology[M]. Beijing:China Water&Power Press,Intellectural Property Publishing House,2004.(in Chinese)
[4]曹杰,郑建国,刘智等.真空预压法处理软土地基的工程应用[J].岩土工程学报,2017,39(S2):124~127.Cao Jie,Zheng Jianguo,Liu Zhi et al. Application of vacuum preloading method in consolidating soft soil foundation[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):124~127.(in Chinese)
[5]张中琼,王清,张泽等.不同真空加载条件下吹填土固结特征[J].工程勘察,2013,41(5):1~5,22.Zhang Zhongqiong,Wang Qing,Zhang Ze et al. Consolidation characteristics of dredger fill under different vacuum loading conditions[J]. Geotechnical Investigation&Surveying,2013,41(5):1~5,22.(in Chinese)
[6] Mesri,G.,Khan,A. Q.. Ground improvement using vacuum loading together with vertical drains[J]. Journal of Geotechnical and Geoenvironmental Engineering,2012,138(6):680~689.
[7]谢晓华,周永章,张澄博等.真空联合堆载预压软基加固机理分析及工程应用[J].四川建筑科学研究,2010,36(5):112~116.Xie Xiaohua,Zhou Yongzhang,Zhang Chengbo et al. Analysis of foundation consolidation mechanism for vacuum surcharge preloading and its engineering application[J]. Sichuan Building Science,2010,36(5):112~116.(in Chinese)
[8]茅兵海,刘华.真空联合堆载预压技术处理某堆场软基的效果分析[J].水运工程,2015,(8):151~154.Mao Binghai,Liu Hua. Effect of vacuum-surcharge combining preloading for soft foundation container yard[J]. Port&Waterway Engineering,2015,(8):151~154.(in Chinese)
[9]陈兰云,赵权威.真空联合堆载加固软土路基实例分析[J].建筑技术,2016,47(9):815~817.Chen Lanyun, Zhao Quanwei. Practical analysis of vacuum preloading method for consolidation of soft soil[J]. Architecture Technology,2016,47(9):815~817.(in Chinese)
[10]龚永康,蔡建.真空—堆载联合预压法处理吹填淤泥试验研究[J].水运工程,2012,(12):238~241.Gong Yongkang,Cai Jian. Experimental study on blown filled muck treatment with vacuum combined surcharge preloading method[J]. Port&Waterway Engineering,2012,(12):238~241.(in Chinese)
[11]彭劼,刘汉龙,陈永辉.真空—堆载联合预压法加固机理讨论[J].河海大学学报,2003,31(5):560~563.Peng Jie,Liu Hanlong,Chen Yonghui. Mechanism of foundation strengthening by vacuum surcharge preloading method[J].Journal of Hohai University,2003,31(5):560~563.(in Chinese)
[12]乐琪浪,赵常洲,杨为民.真空—堆载联合预压法加固软基过程中气、水、土变化规律的试验研究[J].建筑科学,2010,26(1):50~55.Le Qilang,Zhao Changzhou,Yang Weimin. Test study on the movement law of gas、 water and soil in soft foundation by vacuum combined with surcharge preloading[J]. Building Science,2010,26(1):50~55.(in Chinese)
[13]郭印,孙华波,王健等.太仓煤堆场软黏土地基堆载预压处理效果分析[J].工程勘察,2014,42(4):34~37.Guo Yin,Sun Huabo,Wang Jian et al. Analysis on the effect of soft ground improvement by preloading with surcharge in Taicang coal storage yard[J]. Geotechnical Investigation&Surveying,2014,42(4):34~37.(in Chinese)
[2]张福海,陈雷,郭帅杰等.底部抽真空预压法砂井地基固结解析解[J].岩土力学,2014,35(10):2787~2793.Zhang Fuhai,Chen Lei,Guo Shuaijie et al. Analytical solution for consolidation of sand-drained foundation with bottom vacuum preloading method[J]. Rock and Soil Mechanics,2014,35(10):2787~2793.(in Chinese)
[3]龚晓南.地基处理技术发展与展望[M].北京:中国水利水电出版社,知识产权出版社,2004.Gong Xiaonan. Development and prospect of foundation treatment technology[M]. Beijing:China Water&Power Press,Intellectural Property Publishing House,2004.(in Chinese)
[4]曹杰,郑建国,刘智等.真空预压法处理软土地基的工程应用[J].岩土工程学报,2017,39(S2):124~127.Cao Jie,Zheng Jianguo,Liu Zhi et al. Application of vacuum preloading method in consolidating soft soil foundation[J].Chinese Journal of Geotechnical Engineering,2017,39(S2):124~127.(in Chinese)
[5]张中琼,王清,张泽等.不同真空加载条件下吹填土固结特征[J].工程勘察,2013,41(5):1~5,22.Zhang Zhongqiong,Wang Qing,Zhang Ze et al. Consolidation characteristics of dredger fill under different vacuum loading conditions[J]. Geotechnical Investigation&Surveying,2013,41(5):1~5,22.(in Chinese)
[6] Mesri,G.,Khan,A. Q.. Ground improvement using vacuum loading together with vertical drains[J]. Journal of Geotechnical and Geoenvironmental Engineering,2012,138(6):680~689.
[7]谢晓华,周永章,张澄博等.真空联合堆载预压软基加固机理分析及工程应用[J].四川建筑科学研究,2010,36(5):112~116.Xie Xiaohua,Zhou Yongzhang,Zhang Chengbo et al. Analysis of foundation consolidation mechanism for vacuum surcharge preloading and its engineering application[J]. Sichuan Building Science,2010,36(5):112~116.(in Chinese)
[8]茅兵海,刘华.真空联合堆载预压技术处理某堆场软基的效果分析[J].水运工程,2015,(8):151~154.Mao Binghai,Liu Hua. Effect of vacuum-surcharge combining preloading for soft foundation container yard[J]. Port&Waterway Engineering,2015,(8):151~154.(in Chinese)
[9]陈兰云,赵权威.真空联合堆载加固软土路基实例分析[J].建筑技术,2016,47(9):815~817.Chen Lanyun, Zhao Quanwei. Practical analysis of vacuum preloading method for consolidation of soft soil[J]. Architecture Technology,2016,47(9):815~817.(in Chinese)
[10]龚永康,蔡建.真空—堆载联合预压法处理吹填淤泥试验研究[J].水运工程,2012,(12):238~241.Gong Yongkang,Cai Jian. Experimental study on blown filled muck treatment with vacuum combined surcharge preloading method[J]. Port&Waterway Engineering,2012,(12):238~241.(in Chinese)
[11]彭劼,刘汉龙,陈永辉.真空—堆载联合预压法加固机理讨论[J].河海大学学报,2003,31(5):560~563.Peng Jie,Liu Hanlong,Chen Yonghui. Mechanism of foundation strengthening by vacuum surcharge preloading method[J].Journal of Hohai University,2003,31(5):560~563.(in Chinese)
[12]乐琪浪,赵常洲,杨为民.真空—堆载联合预压法加固软基过程中气、水、土变化规律的试验研究[J].建筑科学,2010,26(1):50~55.Le Qilang,Zhao Changzhou,Yang Weimin. Test study on the movement law of gas、 water and soil in soft foundation by vacuum combined with surcharge preloading[J]. Building Science,2010,26(1):50~55.(in Chinese)
[13]郭印,孙华波,王健等.太仓煤堆场软黏土地基堆载预压处理效果分析[J].工程勘察,2014,42(4):34~37.Guo Yin,Sun Huabo,Wang Jian et al. Analysis on the effect of soft ground improvement by preloading with surcharge in Taicang coal storage yard[J]. Geotechnical Investigation&Surveying,2014,42(4):34~37.(in Chinese)