高真空击密法处理吹填粉细砂地基施工参数优化研究
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摘要
高真空击密法是一种新型的软土地基加固方法,目前对其加固机理的研究还不够深入,施工参数的设置没有合理的依据。依托曹妃甸工业区吹填土地基的工程地质条件运用PLAXIS分析了高真空击密法的施工过程,考虑了不同的夯击次数、夯锤直径和排水管深度的工况,提出了各工况下地基沉降特征。结果表明:夯击次数为4次时,累积夯沉量已经达到了1.58 m;夯锤直径为2.1 m时,区域平均夯沉量最大;排水管深度为6.5 m时,地基模型沉降最大。最后确定了满足工程条件的3个优化设计参数,分别是夯击次数为4次,夯锤直径为2.1 m,排水管深度为6.5 m。研究成果为曹妃甸吹填土地区高真空击密法施工的参数设置和选取提供参考,有效提高了地基处理效率和处理效果。
High vacuum compaction method is a new kind of soft soil foundation reinforcement method. At present, the research on its reinforcement mechanism is not deep enough, and there is no reasonable basis for the setting of construction parameters. Based on the engineering geological conditions of dredger fill foundation in Caofeidian Industrial Zone, we simulated the construction process of high vacuum compaction method by using PLAXIS, considering the different ramming times, rammer diameter and drain pipe depth conditions, we put forward the characteristics of foundation settlement under different conditions. The results show that when the number of slamming is 4 times, the cumulative subsidence has reached 1.58 m; when the diameter of the tamping is 2.1 m, the average sag is the largest; when the depth of the drain is 6.5 m, the settlement of the foundation model is the largest. Finally, three optimized design parameters that meet the engineering conditions are determined, namely, the number of slamming is 4, the diameter of the tamper is 2.1 m, and the depth of the drain is 6.5 m. The research results can guide the parameter setting and selection of high-vacuum density method in Caofeidian area, which can effectively improve the efficiency and treatment effect of foundation treatment.
High vacuum compaction method is a new kind of soft soil foundation reinforcement method. At present, the research on its reinforcement mechanism is not deep enough, and there is no reasonable basis for the setting of construction parameters. Based on the engineering geological conditions of dredger fill foundation in Caofeidian Industrial Zone, we simulated the construction process of high vacuum compaction method by using PLAXIS, considering the different ramming times, rammer diameter and drain pipe depth conditions, we put forward the characteristics of foundation settlement under different conditions. The results show that when the number of slamming is 4 times, the cumulative subsidence has reached 1.58 m; when the diameter of the tamping is 2.1 m, the average sag is the largest; when the depth of the drain is 6.5 m, the settlement of the foundation model is the largest. Finally, three optimized design parameters that meet the engineering conditions are determined, namely, the number of slamming is 4, the diameter of the tamper is 2.1 m, and the depth of the drain is 6.5 m. The research results can guide the parameter setting and selection of high-vacuum density method in Caofeidian area, which can effectively improve the efficiency and treatment effect of foundation treatment.
引文
[1]刘成军,王浩.高真空击密法加固吹填软土地基试验研究[J].水运工程,2016(4):160-165.LIU Cheng-jun, WANG Hao. Experimental research on high-vacuum densification method in reinforcing hydraulic fill soft soil foundation[J]. Port&Waterway Engineering, 2016(4):160-165.
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[8]林新炎.软基处理低位预压、高真空击密施工技术分析[J].四川建材,2017,43(10):66-67.LIN Xin-yan. Analysis of soft foundation treatment of low preload and high vacuum compaction construction technology[J]. Sichuan Building Materials, 2017, 43(10):66-67.
[9]施有志,柴建峰,林树枝,等.高真空击密法在平潭综合实验区吹填软基处理效果评价[J].工程地质学报,2017,25(1):11-18.SHI You-zhi, CHAI Jian-feng, LIN Shu-zhi, et al. Application of high vacuum densification method to soft soil foundation treatment engineering at Pingtan comprehensive experimental area[J]. Journal of Engineering Geology, 2017, 25(1):11-18.
[10]汤庆荣,杨建永.强夯法加固地基的设计理论及数值模拟的研究[J].江西理工大学学报,2008,29(3):38-40.TANG Qing-rong,YANG Jian-yong. Study on design theory and numerical simulation of the ground improvement with dynamic consolidation method[J]. Journal of Jiangxi University of Science and Technology, 2008, 29(3):38-40.
[11]王克忠,方锐,侯岩峰,等.强夯加固湿陷性黄土路基的瞬态动力数值模拟[J].北京科技大学学报,2005,27(3):283-286.WANG Ke-zhong, FANG Rui, HOU Yan-feng, et al. Numerical simulation of collapsible loess foundation reinforced by dynamic consolidation technique[J]. Journal of University of Science and Technology Beijing, 2005, 27(3):283-286.
[12]杨为民.强夯后高饱和度地基土工程特性的试验研究及其本构模型——以石家庄市世纪花园地基土为例[D].北京:中国地质大学,2003.YANG Wei-min. The experimental study on engineering characteristics of the soil with high saturated degree after dynamic consolidation and the soil's constitutive model:taking Shijiazhuang Century Garden foundation as an example[D]. Beijing:China University of Geosciences, 2003.
[13]白冰.强夯荷载作用下饱和土层孔隙水压力简化计算方法[J].岩石力学与工程学报,2003,22(9):1 469-1 473.BAI Bing. Pore water pressure of saturated stratum under dynamic impacts[J]. Chinese Journal of Rock Mechanics and Engineering,2003, 22(9):1 469-1 473.
[14]郑红娟.高填方饱和地基土强夯处理数值模拟研究[D].重庆:重庆交通大学,2008.ZHENG Hong-juan. Numerical simulation study on dynamic compaction treatment of high filled saturated soil[D]. Chongqing:Chongqing Jiaotong University, 2008.
[15]郭见扬.强夯夯锤的冲击力问题(强夯加固机理探讨之一)[J].土工基础,1996(2):35-39.GUO Jian-yang. On the hammer impact force of dynamic consolidation[J]. Soil Engineering and Foundation, 1996(2):35-39.
[2]刘亚昌.高真空击密技术在曹妃甸地区路基处理中的运用研究[J].交通科技,2013(6):64-66.LIU Ya-chang. Research on high vacuum densification technology used in subgrade treatment in Caofeidian area[J]. Transportation Science&Technology, 2013(6):64-66.
[3]张尧禹,沈宇鹏.高真空击密法处理吹填土地基的效果分析[J].公路,2015(8):51-53.ZHANG Yao-yu, SHEN Yu-peng. Analysis of the effect of high vacuum densification method for treatment of drainage fill foundation[J]. Highway, 2015(8):51-53.
[4]颜春,黄玮.高真空击密法在吹填土地基处治中的应用[J].西部交通科技,2012(7):7-10.YAN Chun, HUANG Wei. Application of high vacuum densification method in the dredger filled roadbed treatment[J]. Western China Communications Science&Technology, 2012(7):7-10.
[5]王连文,郑少河.高真空击密法加固饱和软土地基的试验研究[J].岩土工程学报,2010(S2):521-524.WANG Lian-wen, ZHENG Shao-he. Experimental research on high vacuum densification method to reinforce saturated soft soil foundation[J]. Chinese Journal of Geotechnical Engineering, 2010(S2):521-524.
[6]龚杰林.高真空击密法在吹填土地基处理上的应用[J].公路交通科技:应用技术版,2013(9):123-125.GONG Jie-lin. Application of high vacuum densification method in treatment of drainage fill foundation[J]. Journal of Highway Communication Technology:Applied Technology Edition, 2013(9):123-125.
[7]徐纪林.快速高真空击密法施工工艺优化研究[J].建筑工程技术与设计,2014(4):43.XU Ji-lin. Study on construction technology optimization of fast high vacuum densification method[J]. Architectural Engineering Technology and Design, 2014(4):43.
[8]林新炎.软基处理低位预压、高真空击密施工技术分析[J].四川建材,2017,43(10):66-67.LIN Xin-yan. Analysis of soft foundation treatment of low preload and high vacuum compaction construction technology[J]. Sichuan Building Materials, 2017, 43(10):66-67.
[9]施有志,柴建峰,林树枝,等.高真空击密法在平潭综合实验区吹填软基处理效果评价[J].工程地质学报,2017,25(1):11-18.SHI You-zhi, CHAI Jian-feng, LIN Shu-zhi, et al. Application of high vacuum densification method to soft soil foundation treatment engineering at Pingtan comprehensive experimental area[J]. Journal of Engineering Geology, 2017, 25(1):11-18.
[10]汤庆荣,杨建永.强夯法加固地基的设计理论及数值模拟的研究[J].江西理工大学学报,2008,29(3):38-40.TANG Qing-rong,YANG Jian-yong. Study on design theory and numerical simulation of the ground improvement with dynamic consolidation method[J]. Journal of Jiangxi University of Science and Technology, 2008, 29(3):38-40.
[11]王克忠,方锐,侯岩峰,等.强夯加固湿陷性黄土路基的瞬态动力数值模拟[J].北京科技大学学报,2005,27(3):283-286.WANG Ke-zhong, FANG Rui, HOU Yan-feng, et al. Numerical simulation of collapsible loess foundation reinforced by dynamic consolidation technique[J]. Journal of University of Science and Technology Beijing, 2005, 27(3):283-286.
[12]杨为民.强夯后高饱和度地基土工程特性的试验研究及其本构模型——以石家庄市世纪花园地基土为例[D].北京:中国地质大学,2003.YANG Wei-min. The experimental study on engineering characteristics of the soil with high saturated degree after dynamic consolidation and the soil's constitutive model:taking Shijiazhuang Century Garden foundation as an example[D]. Beijing:China University of Geosciences, 2003.
[13]白冰.强夯荷载作用下饱和土层孔隙水压力简化计算方法[J].岩石力学与工程学报,2003,22(9):1 469-1 473.BAI Bing. Pore water pressure of saturated stratum under dynamic impacts[J]. Chinese Journal of Rock Mechanics and Engineering,2003, 22(9):1 469-1 473.
[14]郑红娟.高填方饱和地基土强夯处理数值模拟研究[D].重庆:重庆交通大学,2008.ZHENG Hong-juan. Numerical simulation study on dynamic compaction treatment of high filled saturated soil[D]. Chongqing:Chongqing Jiaotong University, 2008.
[15]郭见扬.强夯夯锤的冲击力问题(强夯加固机理探讨之一)[J].土工基础,1996(2):35-39.GUO Jian-yang. On the hammer impact force of dynamic consolidation[J]. Soil Engineering and Foundation, 1996(2):35-39.