真空联合堆载预压设计与现场监测
|
摘要
随着浙江沿海社会经济的日益发展,对电力的需求越来越迫切,变电所等电力建设工程日益增多。由于浙江沿海地区土质条件差,广泛分布着深厚的软土层,主要为淤泥和淤泥质土,该土层具有含水量高、渗透性差、强度低、孔隙大、低密度并具一定的结构性的特点,其分布往往不均匀,并且地势较低,需要大面积填土,因此给变电所的地基处理带来了较大困难。目前软土地基处理方法很多,真空预压法是软弱地基处理较为有效的方法之一,由于目前真空联合堆载预压方法在加固机理、施工工艺等方面的研究不多。本文结合具体的工程实践,对真空联合堆载预压加固软土地基的机理、施工工艺、设计及现场监测进行了比较深入的分析,得到了下列有益于工程研究和应用的结论:
1.真空作用下的地基土产生收缩变形,不会发生侧向挤出,同时能抵消相应的堆载作用下产生的土体的挤出力。改善了填土速度问题,但是如果加载速率过快也会导致堆载失稳。
2.真空预压一般适用于地质剖面存在无透水底层或均质型粘性土的软土地基中,适用加固浙江沿海变电所软基。只有保证排水系统、密封系统、抽真空系统等的正常,才能使真空联合堆载预压取得成功。
3.通过现场观测资料分析,采用真空联合堆载预压法加固变电所软土地基,不仅加固效果较好,而且加固深度深,可以消除一定的工后沉降,比较适合加固变电所场地的深厚软基。
With the coast of Zhejiang's social and economic development in the growing, the demand for electricity has become an increasingly pressing, such as the electricity substation construction project on the rise. Zhejiang's coastal areas due to poor soil conditions, the distribution of a wide range of deep soft soil, mainly mud and silt soil, the soil has a high water content, poor permeability, low strength, porosity, low-density and a certain amount of structural Its distribution is often uneven and low-lying, need to fill a large area, the substation to the ground treatment has brought more difficulties. There are many ways to deal with the current soft ground, pre-vacuum pressure is weak foundation to deal with one of the more effective way, as there is a vacuum preloading a joint approach in the mechanism of reinforcement, construction techniques and so on the little research. In this paper, concrete engineering practice, the joint vacuum preloading mechanism of reinforcement of soft soil, construction technology, design and on-site monitoring carried out a more in-depth analysis, the following has been beneficial to the engineering study and application of the conclusions:
1. Vacuum preloaded the soil deformation resulting contraction will not occur out of the lateral and at the same time be able to offset the surcharge under generated out of the soil, improving the speed of filling, but if the loading rate over Will quickly lead to instability surcharge.
2. Vacuum preloading generally applicable to non-existence of the geological section of the bottom water or homogeneous type of cohesive soil in soft soil for reinforcement of coastal Zhejiang-based soft substation. To ensure that only the drainage system, sealing systems, vacuum systems, such as normal to make a joint vacuum preloading test successfully.
3. Observational data through on-site analysis, the joint use of vacuum preloading law substation soft soil reinforcement, strengthening not only better but also reinforced the depth of deep, must be able to remove the settlement after more suitable for strengthening substation sites the soft-deep.
1.真空作用下的地基土产生收缩变形,不会发生侧向挤出,同时能抵消相应的堆载作用下产生的土体的挤出力。改善了填土速度问题,但是如果加载速率过快也会导致堆载失稳。
2.真空预压一般适用于地质剖面存在无透水底层或均质型粘性土的软土地基中,适用加固浙江沿海变电所软基。只有保证排水系统、密封系统、抽真空系统等的正常,才能使真空联合堆载预压取得成功。
3.通过现场观测资料分析,采用真空联合堆载预压法加固变电所软土地基,不仅加固效果较好,而且加固深度深,可以消除一定的工后沉降,比较适合加固变电所场地的深厚软基。
With the coast of Zhejiang's social and economic development in the growing, the demand for electricity has become an increasingly pressing, such as the electricity substation construction project on the rise. Zhejiang's coastal areas due to poor soil conditions, the distribution of a wide range of deep soft soil, mainly mud and silt soil, the soil has a high water content, poor permeability, low strength, porosity, low-density and a certain amount of structural Its distribution is often uneven and low-lying, need to fill a large area, the substation to the ground treatment has brought more difficulties. There are many ways to deal with the current soft ground, pre-vacuum pressure is weak foundation to deal with one of the more effective way, as there is a vacuum preloading a joint approach in the mechanism of reinforcement, construction techniques and so on the little research. In this paper, concrete engineering practice, the joint vacuum preloading mechanism of reinforcement of soft soil, construction technology, design and on-site monitoring carried out a more in-depth analysis, the following has been beneficial to the engineering study and application of the conclusions:
1. Vacuum preloaded the soil deformation resulting contraction will not occur out of the lateral and at the same time be able to offset the surcharge under generated out of the soil, improving the speed of filling, but if the loading rate over Will quickly lead to instability surcharge.
2. Vacuum preloading generally applicable to non-existence of the geological section of the bottom water or homogeneous type of cohesive soil in soft soil for reinforcement of coastal Zhejiang-based soft substation. To ensure that only the drainage system, sealing systems, vacuum systems, such as normal to make a joint vacuum preloading test successfully.
3. Observational data through on-site analysis, the joint use of vacuum preloading law substation soft soil reinforcement, strengthening not only better but also reinforced the depth of deep, must be able to remove the settlement after more suitable for strengthening substation sites the soft-deep.
引文
[1]Kjellman,Consolidation of clay by means of atmosphere pressure,Proceedings of a conference on soil stabilization,Boston,M.I.T.press,1952.
[2]叶柏荣,唐羿生,陆舜英.真空预压加固软基方法的应用与发展.交通部—航局科研所,1984.10.
[3]尚世佐.真空联合堆载预压在上海某装卸区的试验研究水运工程,1988.
[4]钱家欢,赵维炳考虑粘弹性及成层土砂井地基设计综述.河海大学学报,1991.6.
[5]谢康和,曾国熙.等应变条件下的砂井固结理论.岩土工程学报1989.3.
[6]赵维炳—砂井地基固结分析半解析解方法的改进.岩土工程学报1991.7.
[7]赵维炳,钱家欢,真空预压砂井地基的设计.排水预压加固软十地基设计理论研究论文集,河海大学岩土工程研究所.1997,3.
[8]高志义,张美燕,刘立任等,真空预压加固的离心模型试验研究,港口工程,1988,No.1,18-24.
[9]张诚厚,王伯衍,曹永琅,真空作用面位置及排水管间距对预压效果的影响,岩土工程学报,1990,12(1),45-5
[10]张力霆,卢勇正,李树国,改善真空预压效果的试验研究,河北工程技术高等专科学校学报,1999,No.1,12-18
[11]王永强,真空预压荷载下地基土的静载试验分析,中国港湾建设,1999,No.2.27-28.
[12]高志义,张美燕,张健,真空预压联合电渗法室内模型试验研究,中国港湾建设,2000,No.5,58-61。
[13]严蕴,房震,花剑岚,真空堆载预压处理软基效果的室内试验研究,河海大学学报(自然科学版),2002,30(5),118-121
[14]龚晓南,岑仰润,真空预压加固软土地基机理探讨,哈尔滨建筑大学学报,2002,35(2),7-10.
[15]岑仰润,真空预压加固地基的试验及理论研究,浙江大学博士论文,2003
[16]石水玉,黄腾,习应祥,软基加固前后软土的微结构及物理力学性质的变化,长沙交通学院学报,2003,19(3),45-49
[17]沈扬,梁晓东,岑仰润,龚晓南,真空固结室内实验模拟与机理浅析,中 国农村水利水电,2004,No.4,58-60,64.
[18]刘汉龙,李豪,彭劫,高玉峰,真空—堆载联合预压加固软基室内试验研究,岩土工程学报,2004,26(1),145-149.
[19]闫澎旺,傅海峰,刘润,纪玉诚,真空预压机理模拟装置及典型示范结果,天津大学学报,2005,38(7),611-614.
[20]吴桂芬,高玉峰,魏代现,刘汉龙,真空和堆载两种预压法的室内试验研究,岩土力学,2005,增刊,95-98.
[21]Indraratna B.,Sathananthan I.andR ujikiatkamjom C.,etal,Analytical and numerical of modeling of soft soil stabilized by PVD incorporating vacuumpreloading,Geomechanics,2005,5(2),114-124.
[22]娄炎,负压条件下软土地基的孔隙水压力,水利学报,1988,No.9,48-52.
[23]孔德金,苗中海,软基加固检测孔隙水压力分析,港工技术,2000,No.3,43-46.
[24]聂跃高,赵维炳,施建勇,洪宝宁,高速公路软基膜下真空度的影响因素及对策,西部探矿工程,2002,No.6,143-144.
[25]岑仰润,龚晓南,温晓贵,真空排水预压工程中孔压实测资料的分析与应用,浙江大学学报(工学版),2003,37(1),16-18,55.
[26]陈环,鲍秀清,负压条件下土的固结有效应力,岩土工程学报,1984,6(5),39-47.
[27]闫澎旺,陈环,用真空加固软土地基的机制与计算方法,岩土工程学报,1986,8(2),35-44.
[28]陈环,真空预压法机理研究十年,港口工程,1991,No.4,17-26
[29]杨国强,真空预压法机理探讨,水运工程,1991,No.6,34-3
[30]钱家欢,赵维炳,真空预压砂井地基固结分析的半解析方法,中国科学(A 辑),1988,No.4,439-448.
[31]沈珠江,陆舜英,软土地基真空排水预压的固结变形分析,岩土工程学报,1986,8(3),7-15.
[32]董志良,堆载及真空预压法加固地基地下水位及测管水位高度的分析与计算,水运工程,2001,331(8),15-19.
[33]张泽鹏,李约俊,冯淦清,洪宝宁,塑料排水板在真空预压加固软基中的作用,广州大学学报(自然科学版),2002,1(2),68-7
[34]朱建才,温晓贵,龚晓南,岑仰润,真空排水预压法中真空度分布的影响因素分析,哈尔滨工业大学学报,2003,35(11),1399-1401,1404,1408.
[35]杨顺安,吴建中,真空联合堆载预压法作用机理及其应用,地质科技情报,2000,19(3),77-80.
[36]李豪,高玉峰,刘汉龙,彭劫,Mahfouz A H,真空—堆载联合预压加固软基简化计算方法,岩土工程学报,2003,25(1),58-62.
[37]董志良,堆载及真空预压一塑料板排水加固地基渗流量的分析与计算,第二届塑料板排水法加固软基技术研讨会论文集(厦门),南京:河海大学出版社,1993
[38]徐泽中,刘世同,柴玉卿,真空堆载联合预压法的渗流分析,河海大学学报,2002,30(3),85-88.
[39]刘汉龙,彭劫,陈永辉,郑绍君,真空—堆载预压处理高速公路软基的有限元计算,中国公路学报,2004,17(2),37-42.
[40]周顺华,王炳龙,李尧臣,陈国芳,真空排水固结法处理地基的沉降计算,铁道学报,2001,23(2),58-60.
[41]彭劫,刘汉龙,陈永辉,李豪,真空—堆载联合预压法软基加固对周围环境的影响,岩土工程学报,2002,24(5),656-659.
[42]范须顺,关于确定真空预压施工中滤水管间距及布排形式的探讨,港口工程,1993,No.2,36-39.
[43]毛志兴,安春秀,黄达余等,220kV港湾变电所真空联合堆载预压加固试验研究,第九届全国地基处理学术讨论会论文集,2006,太原,76-82
[44]金小荣,真空联合堆载预压加固软基试验及理论研究,浙江大学博士学位论文,2007
[45]朱建才,真空联合堆载预压加固软基机理及工艺研究,浙江大学博士学位论文,2004
[46]建筑地基处理技术规范,JGJ79-91,北京:建筑工业出版社,2000
[47]港口工程地基规范,JTJ250-98,北京:水利水电出版社,1998
[48]彭劫、刘汉龙、陈永辉等,真空-堆载联合预压法软基加固对周围环境的影响田,岩土工程学报,2002(5):656-662
[49]沈珠江,软土地基真空排水应用的固结变形分析[J],岩土工程学报,1986(3):7-15
[50]陈远洪、洪宝宁、龚道勇,真空预压法对周围环境影响的数值分析[J],岩土力学,2002(3):382- 386
[51]吴跃东.排水固结法在高速公路软基加固中的应用,华东公路,2002,1
[52]孟昭即.对真空预压影响深度的探讨,地基处理,2003,9
[2]叶柏荣,唐羿生,陆舜英.真空预压加固软基方法的应用与发展.交通部—航局科研所,1984.10.
[3]尚世佐.真空联合堆载预压在上海某装卸区的试验研究水运工程,1988.
[4]钱家欢,赵维炳考虑粘弹性及成层土砂井地基设计综述.河海大学学报,1991.6.
[5]谢康和,曾国熙.等应变条件下的砂井固结理论.岩土工程学报1989.3.
[6]赵维炳—砂井地基固结分析半解析解方法的改进.岩土工程学报1991.7.
[7]赵维炳,钱家欢,真空预压砂井地基的设计.排水预压加固软十地基设计理论研究论文集,河海大学岩土工程研究所.1997,3.
[8]高志义,张美燕,刘立任等,真空预压加固的离心模型试验研究,港口工程,1988,No.1,18-24.
[9]张诚厚,王伯衍,曹永琅,真空作用面位置及排水管间距对预压效果的影响,岩土工程学报,1990,12(1),45-5
[10]张力霆,卢勇正,李树国,改善真空预压效果的试验研究,河北工程技术高等专科学校学报,1999,No.1,12-18
[11]王永强,真空预压荷载下地基土的静载试验分析,中国港湾建设,1999,No.2.27-28.
[12]高志义,张美燕,张健,真空预压联合电渗法室内模型试验研究,中国港湾建设,2000,No.5,58-61。
[13]严蕴,房震,花剑岚,真空堆载预压处理软基效果的室内试验研究,河海大学学报(自然科学版),2002,30(5),118-121
[14]龚晓南,岑仰润,真空预压加固软土地基机理探讨,哈尔滨建筑大学学报,2002,35(2),7-10.
[15]岑仰润,真空预压加固地基的试验及理论研究,浙江大学博士论文,2003
[16]石水玉,黄腾,习应祥,软基加固前后软土的微结构及物理力学性质的变化,长沙交通学院学报,2003,19(3),45-49
[17]沈扬,梁晓东,岑仰润,龚晓南,真空固结室内实验模拟与机理浅析,中 国农村水利水电,2004,No.4,58-60,64.
[18]刘汉龙,李豪,彭劫,高玉峰,真空—堆载联合预压加固软基室内试验研究,岩土工程学报,2004,26(1),145-149.
[19]闫澎旺,傅海峰,刘润,纪玉诚,真空预压机理模拟装置及典型示范结果,天津大学学报,2005,38(7),611-614.
[20]吴桂芬,高玉峰,魏代现,刘汉龙,真空和堆载两种预压法的室内试验研究,岩土力学,2005,增刊,95-98.
[21]Indraratna B.,Sathananthan I.andR ujikiatkamjom C.,etal,Analytical and numerical of modeling of soft soil stabilized by PVD incorporating vacuumpreloading,Geomechanics,2005,5(2),114-124.
[22]娄炎,负压条件下软土地基的孔隙水压力,水利学报,1988,No.9,48-52.
[23]孔德金,苗中海,软基加固检测孔隙水压力分析,港工技术,2000,No.3,43-46.
[24]聂跃高,赵维炳,施建勇,洪宝宁,高速公路软基膜下真空度的影响因素及对策,西部探矿工程,2002,No.6,143-144.
[25]岑仰润,龚晓南,温晓贵,真空排水预压工程中孔压实测资料的分析与应用,浙江大学学报(工学版),2003,37(1),16-18,55.
[26]陈环,鲍秀清,负压条件下土的固结有效应力,岩土工程学报,1984,6(5),39-47.
[27]闫澎旺,陈环,用真空加固软土地基的机制与计算方法,岩土工程学报,1986,8(2),35-44.
[28]陈环,真空预压法机理研究十年,港口工程,1991,No.4,17-26
[29]杨国强,真空预压法机理探讨,水运工程,1991,No.6,34-3
[30]钱家欢,赵维炳,真空预压砂井地基固结分析的半解析方法,中国科学(A 辑),1988,No.4,439-448.
[31]沈珠江,陆舜英,软土地基真空排水预压的固结变形分析,岩土工程学报,1986,8(3),7-15.
[32]董志良,堆载及真空预压法加固地基地下水位及测管水位高度的分析与计算,水运工程,2001,331(8),15-19.
[33]张泽鹏,李约俊,冯淦清,洪宝宁,塑料排水板在真空预压加固软基中的作用,广州大学学报(自然科学版),2002,1(2),68-7
[34]朱建才,温晓贵,龚晓南,岑仰润,真空排水预压法中真空度分布的影响因素分析,哈尔滨工业大学学报,2003,35(11),1399-1401,1404,1408.
[35]杨顺安,吴建中,真空联合堆载预压法作用机理及其应用,地质科技情报,2000,19(3),77-80.
[36]李豪,高玉峰,刘汉龙,彭劫,Mahfouz A H,真空—堆载联合预压加固软基简化计算方法,岩土工程学报,2003,25(1),58-62.
[37]董志良,堆载及真空预压一塑料板排水加固地基渗流量的分析与计算,第二届塑料板排水法加固软基技术研讨会论文集(厦门),南京:河海大学出版社,1993
[38]徐泽中,刘世同,柴玉卿,真空堆载联合预压法的渗流分析,河海大学学报,2002,30(3),85-88.
[39]刘汉龙,彭劫,陈永辉,郑绍君,真空—堆载预压处理高速公路软基的有限元计算,中国公路学报,2004,17(2),37-42.
[40]周顺华,王炳龙,李尧臣,陈国芳,真空排水固结法处理地基的沉降计算,铁道学报,2001,23(2),58-60.
[41]彭劫,刘汉龙,陈永辉,李豪,真空—堆载联合预压法软基加固对周围环境的影响,岩土工程学报,2002,24(5),656-659.
[42]范须顺,关于确定真空预压施工中滤水管间距及布排形式的探讨,港口工程,1993,No.2,36-39.
[43]毛志兴,安春秀,黄达余等,220kV港湾变电所真空联合堆载预压加固试验研究,第九届全国地基处理学术讨论会论文集,2006,太原,76-82
[44]金小荣,真空联合堆载预压加固软基试验及理论研究,浙江大学博士学位论文,2007
[45]朱建才,真空联合堆载预压加固软基机理及工艺研究,浙江大学博士学位论文,2004
[46]建筑地基处理技术规范,JGJ79-91,北京:建筑工业出版社,2000
[47]港口工程地基规范,JTJ250-98,北京:水利水电出版社,1998
[48]彭劫、刘汉龙、陈永辉等,真空-堆载联合预压法软基加固对周围环境的影响田,岩土工程学报,2002(5):656-662
[49]沈珠江,软土地基真空排水应用的固结变形分析[J],岩土工程学报,1986(3):7-15
[50]陈远洪、洪宝宁、龚道勇,真空预压法对周围环境影响的数值分析[J],岩土力学,2002(3):382- 386
[51]吴跃东.排水固结法在高速公路软基加固中的应用,华东公路,2002,1
[52]孟昭即.对真空预压影响深度的探讨,地基处理,2003,9
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |