直排式真空预压在吹填土地区的应用研究
|
摘要
研究目的:直排式真空预压法消除了砂垫层、滤管、滤膜对真空荷载传递的阻尼作用,比常规真空预压法具有更好的加固效果。但现有试验多将直排区和常规区位于不同的真空系统下,真空度加载规律不一致,故本文试验采用同一真空系统,以便对直排式真空预压法的加固效果进行比较。研究结论:将直排区和常规区布置在同一张密封膜下,使用同一真空排水管网进行处理,现场试验结果表明:(1)经直排式真空预压法处理后,土的各项物理力学指标均好于常规真空预压区;(2)对试验的地基沉降数据采用沉降曲线推算固结度,得出直排区的固结度高于常规真空预压法;(3)直排式真空预压法具有施工成本低、真空能效利用率高、加固时间短、加固效果好等显著效果;(4)本研究成果对直排式真空预压处理吹填土路基有一定的指导作用。
Research purposes:Straight-line vacuum preloading method has better consolidation effect for eliminating the damping of the sand cushion,filter tube and filter membrane in transmitting the vacuum load.But the loading laws of the two areas are different because the two areas are under different vacuum systems in general tests.So the same vacuum system was used in this test,to compare the consolidation effect of straight-line vacuum preloading method.Research conclusions:The field test is done that straight-line vacuum preloading area and normal vacuum preloading area are under same vacuum system.The experimental results show that:(1) The physical and mechanical indexes of the straight-line vacuum preloading method are better than those of the normal method;(2) By analyzing the data of the foundation settlement,the consolidation degree of the straight-line vacuum preloading area is higher than that of the normal vacuum preloading area;(3) Straight-line vacuum preloading method has remarkable effect for its lower cost,higher vacuum utilization,shorter consolidation time and better effect;(4) The research results can be used to guide the treatment of dredger fill subgrade by straight-line vacuum preloading.
Research purposes:Straight-line vacuum preloading method has better consolidation effect for eliminating the damping of the sand cushion,filter tube and filter membrane in transmitting the vacuum load.But the loading laws of the two areas are different because the two areas are under different vacuum systems in general tests.So the same vacuum system was used in this test,to compare the consolidation effect of straight-line vacuum preloading method.Research conclusions:The field test is done that straight-line vacuum preloading area and normal vacuum preloading area are under same vacuum system.The experimental results show that:(1) The physical and mechanical indexes of the straight-line vacuum preloading method are better than those of the normal method;(2) By analyzing the data of the foundation settlement,the consolidation degree of the straight-line vacuum preloading area is higher than that of the normal vacuum preloading area;(3) Straight-line vacuum preloading method has remarkable effect for its lower cost,higher vacuum utilization,shorter consolidation time and better effect;(4) The research results can be used to guide the treatment of dredger fill subgrade by straight-line vacuum preloading.
引文
[1]夏玉斌,陈允进.直排式真空预压法加固软土地基的试验与研究[J].工程地质学报,2010(3):376-384.Xia Yubin, Chen Yunjin. Experimental Study andResearch on Straight-line Vacuum Preloading Methodto Reinforce Soft Soil[J]. Journal of EngineeringGeology,2010(3):376-384.
[2]中交第一航务工程勘察设计院有限公司.直排式真空预压法加固软土地基结构:中国,200820075002.7[P]. 2008-12-17.CCCC First Harbor Consultants Co. Ltd. Straight-lineVacuum Preloading Method to Reinforce Soft Soil:200820075002.7[P]. 2008-12-17.
[3]王军,蔡袁强,符洪涛,等.新型防淤堵真空预压法室内与现场试验研究[J].岩石力学与工程学报,2014(6):1257-1268.Wang Jun,Cai Yuanqiang,Fu Hongtao,etc. Indoor andField Experiment on Vacuum Preloading with New Anti-Clogging Measures[J]. Chinese Journal of RockMechanics and Engineering,2014(6):1257-1268.
[4]于建海,豆文朋.直排式真空预压法在高渗透软黏土地基中的应用[J].水运工程,2012(7):181-184.Yu Jianhai, Dou Wenpeng. Application of DirectVacuum Preloading Method to Soft Clay Stratum withHigh Permeability[J]. Port&Waterway Engineering,2012(7):181-184.
[5]陈允进,夏玉斌,刘健,等.直排式真空预压法加固高黏性超软吹填土室内模型试验研究[J].水运工程,2011(10):125-131.Chen Yunjin,Xia Yubin,Liu Jian,etc. LaboratoryModel Test of Reinforcing Heavy Clay recentlyReclaimed Soil by Straight-line Vacuum Preloading[J].Port&Waterway Engineering,2011(10):125-131.
[6]谢兰芳,罗勇威,许健敏.直排式与抽水式固结在地基加固中的联合应用[J].土工基础,2018(2):126-131.Xie Lanfang, Luo Yongwei, Xu Jianmin. CombineApplication of Straight-line and Pumping to SoilConsolidate[J]. Soil Engineering and Foundation,2018(2):126-131.
[7]郭霄,谢康和,卢萌盟,等.直排式真空预压法下竖井地基的非线性固结解析解[J].中南大学学报:自然科学版,2018(2):384-392.Guo Xiao,Xie Kanghe,Lu Mengmeng,etc. NonlinearAnalytical Solution for Consolidation of Vertical Drainsby Straight-line Vacuum Preloading Method[J].Journal of Central South University:Science andTechnology,2018(2):384-392.
[8]王旭,刘强,芦志强.直排式真空预压工艺创新实践[J].水运工程,2014(4):164-167.Wang Xu,Liu Qiang,Lu Zhiqiang. Innovative Practiceof Straight-line Vacuum Reloading[J]. Port&Waterway Engineering,2014(4):164-167.
[2]中交第一航务工程勘察设计院有限公司.直排式真空预压法加固软土地基结构:中国,200820075002.7[P]. 2008-12-17.CCCC First Harbor Consultants Co. Ltd. Straight-lineVacuum Preloading Method to Reinforce Soft Soil:200820075002.7[P]. 2008-12-17.
[3]王军,蔡袁强,符洪涛,等.新型防淤堵真空预压法室内与现场试验研究[J].岩石力学与工程学报,2014(6):1257-1268.Wang Jun,Cai Yuanqiang,Fu Hongtao,etc. Indoor andField Experiment on Vacuum Preloading with New Anti-Clogging Measures[J]. Chinese Journal of RockMechanics and Engineering,2014(6):1257-1268.
[4]于建海,豆文朋.直排式真空预压法在高渗透软黏土地基中的应用[J].水运工程,2012(7):181-184.Yu Jianhai, Dou Wenpeng. Application of DirectVacuum Preloading Method to Soft Clay Stratum withHigh Permeability[J]. Port&Waterway Engineering,2012(7):181-184.
[5]陈允进,夏玉斌,刘健,等.直排式真空预压法加固高黏性超软吹填土室内模型试验研究[J].水运工程,2011(10):125-131.Chen Yunjin,Xia Yubin,Liu Jian,etc. LaboratoryModel Test of Reinforcing Heavy Clay recentlyReclaimed Soil by Straight-line Vacuum Preloading[J].Port&Waterway Engineering,2011(10):125-131.
[6]谢兰芳,罗勇威,许健敏.直排式与抽水式固结在地基加固中的联合应用[J].土工基础,2018(2):126-131.Xie Lanfang, Luo Yongwei, Xu Jianmin. CombineApplication of Straight-line and Pumping to SoilConsolidate[J]. Soil Engineering and Foundation,2018(2):126-131.
[7]郭霄,谢康和,卢萌盟,等.直排式真空预压法下竖井地基的非线性固结解析解[J].中南大学学报:自然科学版,2018(2):384-392.Guo Xiao,Xie Kanghe,Lu Mengmeng,etc. NonlinearAnalytical Solution for Consolidation of Vertical Drainsby Straight-line Vacuum Preloading Method[J].Journal of Central South University:Science andTechnology,2018(2):384-392.
[8]王旭,刘强,芦志强.直排式真空预压工艺创新实践[J].水运工程,2014(4):164-167.Wang Xu,Liu Qiang,Lu Zhiqiang. Innovative Practiceof Straight-line Vacuum Reloading[J]. Port&Waterway Engineering,2014(4):164-167.