强夯法处理沙漠地基承载力及变形特性研究
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摘要
强夯法DCM(Dynamic Compaction Method),又称动力固结法,是一种经济高效的地基处理方法。强夯法对进一步提高地基强度,降低土的压缩性,改善砂土的抗液化条件,消除湿陷性黄土的湿陷性等有显著的效果,同时,强夯法还可提高土层的均匀程度,减少将来可能出现的差异沉降。因此强夯法广泛应用于多种不同土性的场地,但是对于其用在沙漠地区还是处于初探阶段,本文的研究价值也就在于此。
本文针对在内蒙古沙漠地区强夯处理地基效果的检测滞后于施工的情况,依托实际工程,开展了对强夯处理沙漠地基的承载力及变形特性进行研究,以求为类似场地进行强夯法的设计、施工、检测积累经验,获取基本设计参数。
本文在强夯法处理地基应用及检测研究现状的基础上,比较出强夯法处理沙漠地基常用的检测手段是平板载荷试验和标准贯入试验。研究了地基破坏模式和地基承载力的理论。
依托实际工程,在内蒙古一强夯处理的沙漠地基上进行不同板宽的平板载荷试验和标准贯入试验以及室内土工试验,归纳总结了强夯处理沙漠地基平板载荷试验的尺寸效应规律,给出了不同板宽平板载荷试验确定承载力的修正系数;确定了变形模量和标贯击数标准值,压缩模量与标贯击数标准值,压缩模量和干密度的基本相关关系。
Dynamic Compaction(DC in short), as know as Dynamic Consolidation,has become a generally accepted ground improvement technique for its simplicity and cost-effectiveness. DC has been used for increase in load supporting capacity,reduction in compressibility of various types of soil deposits and liquefaction potential of sand or silty sand deposits,densification of collapsible soils .It also can increase homogeneous so that reduce the differential settlement. So dynamic compaction method applied to a wide range of different endemic to the arena.But the study on DC in the dessert is still in the primary stage.That is why we research.
This paper study on subgrade bearing capacity and deformation characteristics in Dynamic Compaction (DC) desert foundation based on engineering practice for the detection of DC lag behind construction in Mongolia. It can gain expericence for the design, construcion and detection of DC in similar site.
The auther elaborate research status on application and detection of DC, and knows that a detection methed of DC desert foundation mainly are plate loading test and standard penetration test.This paper also discuss ground failure mode and the theory calculation method of the subgrade bearing capacity.
Based on the practical project,PLT of some different aras plate and SPT in DC dessert foundation in Mongolia have been carried out and to take laboratory test. These experiments obtained size effect rules of PLT in DC dessert foundation, put forward different board wide plate loading test modification coefficient,established relationships between deformation modulus and SPT counts values, compression modulus and SPT counts values, compression modulus and dry density.
本文针对在内蒙古沙漠地区强夯处理地基效果的检测滞后于施工的情况,依托实际工程,开展了对强夯处理沙漠地基的承载力及变形特性进行研究,以求为类似场地进行强夯法的设计、施工、检测积累经验,获取基本设计参数。
本文在强夯法处理地基应用及检测研究现状的基础上,比较出强夯法处理沙漠地基常用的检测手段是平板载荷试验和标准贯入试验。研究了地基破坏模式和地基承载力的理论。
依托实际工程,在内蒙古一强夯处理的沙漠地基上进行不同板宽的平板载荷试验和标准贯入试验以及室内土工试验,归纳总结了强夯处理沙漠地基平板载荷试验的尺寸效应规律,给出了不同板宽平板载荷试验确定承载力的修正系数;确定了变形模量和标贯击数标准值,压缩模量与标贯击数标准值,压缩模量和干密度的基本相关关系。
Dynamic Compaction(DC in short), as know as Dynamic Consolidation,has become a generally accepted ground improvement technique for its simplicity and cost-effectiveness. DC has been used for increase in load supporting capacity,reduction in compressibility of various types of soil deposits and liquefaction potential of sand or silty sand deposits,densification of collapsible soils .It also can increase homogeneous so that reduce the differential settlement. So dynamic compaction method applied to a wide range of different endemic to the arena.But the study on DC in the dessert is still in the primary stage.That is why we research.
This paper study on subgrade bearing capacity and deformation characteristics in Dynamic Compaction (DC) desert foundation based on engineering practice for the detection of DC lag behind construction in Mongolia. It can gain expericence for the design, construcion and detection of DC in similar site.
The auther elaborate research status on application and detection of DC, and knows that a detection methed of DC desert foundation mainly are plate loading test and standard penetration test.This paper also discuss ground failure mode and the theory calculation method of the subgrade bearing capacity.
Based on the practical project,PLT of some different aras plate and SPT in DC dessert foundation in Mongolia have been carried out and to take laboratory test. These experiments obtained size effect rules of PLT in DC dessert foundation, put forward different board wide plate loading test modification coefficient,established relationships between deformation modulus and SPT counts values, compression modulus and SPT counts values, compression modulus and dry density.
引文
[1] L.Menard,Y.Boroise. Theoretica land Prectieal Aspects of Dynamic Consolidation, Ground Treatment by DeeP ComPaetion.Telford Ltd.London,1976.
[2]王铁宏.新编全国重大工程项目地基处理工程实录[M].北京:中国建筑工业出版社,2004.
[3]潘千里.国外一种新的地基加固方法一强夯法[J].建筑结构,No.6,1978.
[4]钱征,李广武,王文奎.强夯法加固松软地基[J].岩土工程学报,Vol.2,No.l,1980.3.
[5] Kyle M.Rollins,Ji-Hyoung Kim. U.S.experience with dynamic compaction of eollapsible soils.pp25-43.In-situ deep soil improvement.ASCE.New York,1994.
[6]韩晓雷,席亚军,水伟厚等.15000kN?m超高能级强夯法处理湿陷性黄土的应用研究[J].水利与建筑工程学报.2009,7(3).
[7] Robert G Lukas.Dynamic Compaction Engineering Consideration.In:Proc.of ASCE Specialty Conference on Grouting,Soil Improvement and Geosythesis.New Orleans.Ladd Geoteclinieai Special Publieation 30,1992,Vol.2,pp940一953.
[8] D.J.Bevan.The use of dynamic compaction to remove/reduce risks due to collapse compressioAnd seism city in silty fine sands at smelter in Iran.Ground Improvement Geosystems.ThomasTelford,London,1997,pp45-53.
[9]谷志孟,吴文.对废气采场和城镇垃圾实施两结合综合治理的思考与建议[J].岩土力学,2002,第5期,pp616-617.
[10] J.A.Charies,D.Burford,K.S.Watts.Field Studies of the Effeetiveness of Dynamic Consolidation.Proeeedings of the 10th International Conference on Soil Mechanies and Foundation Engineering(II),Stoekholm,1981,12/10,pp617-622.
[11] J.A.Charles.Ground improvement:the interaction of engineering seience and experience-basedteehnology.Geotechnique.2002,Vol.52,No.7,pp.527-532.
[12] M.P Gambin.Ten Years of Dynamic Compaction.Proceedings of the Eighth Regional Conference for Africa on Soil Mechanics and Foundation Engineering,Harare,1984.
[13] William F.Van Impe,Abdelmalek Bouazza.Densification of domestic waste fills by dynamic compaction.Can.Geotech.J.,Vol.33(6).1996,pp879-887.
[14] Seott R.Mc Mullin.Evaluation of dynamic compaction of low level waste burial trenehes containing B-25 Boxes.pp44-54.In-situ deep soil improvement.ASCE.NewYork,1994.
[15] Cliff Sehexnayder. Dynamic compaction of nuclear waste.Civil engineering,Vol.62(3),Mar.1992,pp64-65.
[16]高思毅,陈鸿斌,韩国都.强夯法加固靖边天然气净化厂沙漠地基[J].石油工程建设.1997,No.l,pp17-20.
[17] R.G.Lukas Delayed soll improvement after dynamic compaction.Ground Improvement , Ground Reinforcement,Ground Treatment.Published by the ASCE,1997,pp409-420.
[18] K.W.Lo.et al.Unified Approach to Ground Improvement by Heavy Tamping.ASCE,GT3,1990,VII6(3):514?527.
[19]董耀.强夯加固软土地基的实践与机理[J].上海水利,1995(3),25?29.
[20]方永凯等.强夯法加固地基的若干问题[D].第六届全国土力学与基础工程学术讨论会论文集[C].上海:同济大学出版社,1991:573-575.
[21]王祈望,王仁刚,闫韶兵.动刚度和动力触探在强夯地基检测中的应用[J].岩土力学.2004(5):839-842.
[22]孔令伟,袁建新.强夯的边界接触应力与沉降特性研究[J].岩土工程学报,1998,20(2):86-92.
[23]李大忠.强夯处理湿陷性黄土的承载力计算方法[J].土工基础,2000,14(4).
[24]唐贤强,谢瑛等.地基工程原位测试技术[M].北京:中国铁道出版社,1993.
[25]林宗元.岩土工程试验监测手册[M].北京:中国建筑工业出版社,2005.
[26]林在贯等.岩土工程手册[M].北京:中国建筑工业出版社,1996.
[27]《工程地质手册》编委.《工程地质手册》(第四版)[M].北京:中国建筑工业出版社,2006.
[28]翟洪飞,高云等.载荷试验沉降与承压板尺寸关系的分析[J].西部探矿工程,2008,(10).
[29]李小勇.载荷板尺寸效应的试验研究[J].太原理工大学学报,2005,36(1).
[30]肖兵,张敏勇.平板载荷试验应思考的几个问题[J].岩土力学,2003,24(增刊).
[31]吕镇江.深层搅拌桩及高压旋喷桩复合地基载荷试验中压板面积问题的探讨[J].建筑科学,2001,17(5).
[32]钱家欢,殷宗泽.《土工原理与计算》[M].北京:水利水电出版社,1994.
[33] GB50007-2002.建筑地基基础设计规范[S].
[34]韩晓雷.非饱和沙漠地基土的理论和工程应用的研究[D].西安建筑科技大学,2004.
[35] GB50021-2001.《岩土工程勘察规范》[S].
[36] A.W.Skempton.Standard Penetration Test Proeedures and the Effeets in Sands of Overburden Pressure,Relative Density,Particle Size,Ageing and Over Consolidation[J].Geotechnique,1986,Vol.36,No.3:pp425-444.
[37]郭桂仁,标准贯入原位测试技术方法的分析与讨论[J].华北石油设计,2005(2):30-36.
[38] Terzaghi.K and Peck.R.B,Soil Meahanies in Engineering Practice,Inded,John Wiley, NewYork,1967.
[2]王铁宏.新编全国重大工程项目地基处理工程实录[M].北京:中国建筑工业出版社,2004.
[3]潘千里.国外一种新的地基加固方法一强夯法[J].建筑结构,No.6,1978.
[4]钱征,李广武,王文奎.强夯法加固松软地基[J].岩土工程学报,Vol.2,No.l,1980.3.
[5] Kyle M.Rollins,Ji-Hyoung Kim. U.S.experience with dynamic compaction of eollapsible soils.pp25-43.In-situ deep soil improvement.ASCE.New York,1994.
[6]韩晓雷,席亚军,水伟厚等.15000kN?m超高能级强夯法处理湿陷性黄土的应用研究[J].水利与建筑工程学报.2009,7(3).
[7] Robert G Lukas.Dynamic Compaction Engineering Consideration.In:Proc.of ASCE Specialty Conference on Grouting,Soil Improvement and Geosythesis.New Orleans.Ladd Geoteclinieai Special Publieation 30,1992,Vol.2,pp940一953.
[8] D.J.Bevan.The use of dynamic compaction to remove/reduce risks due to collapse compressioAnd seism city in silty fine sands at smelter in Iran.Ground Improvement Geosystems.ThomasTelford,London,1997,pp45-53.
[9]谷志孟,吴文.对废气采场和城镇垃圾实施两结合综合治理的思考与建议[J].岩土力学,2002,第5期,pp616-617.
[10] J.A.Charies,D.Burford,K.S.Watts.Field Studies of the Effeetiveness of Dynamic Consolidation.Proeeedings of the 10th International Conference on Soil Mechanies and Foundation Engineering(II),Stoekholm,1981,12/10,pp617-622.
[11] J.A.Charles.Ground improvement:the interaction of engineering seience and experience-basedteehnology.Geotechnique.2002,Vol.52,No.7,pp.527-532.
[12] M.P Gambin.Ten Years of Dynamic Compaction.Proceedings of the Eighth Regional Conference for Africa on Soil Mechanics and Foundation Engineering,Harare,1984.
[13] William F.Van Impe,Abdelmalek Bouazza.Densification of domestic waste fills by dynamic compaction.Can.Geotech.J.,Vol.33(6).1996,pp879-887.
[14] Seott R.Mc Mullin.Evaluation of dynamic compaction of low level waste burial trenehes containing B-25 Boxes.pp44-54.In-situ deep soil improvement.ASCE.NewYork,1994.
[15] Cliff Sehexnayder. Dynamic compaction of nuclear waste.Civil engineering,Vol.62(3),Mar.1992,pp64-65.
[16]高思毅,陈鸿斌,韩国都.强夯法加固靖边天然气净化厂沙漠地基[J].石油工程建设.1997,No.l,pp17-20.
[17] R.G.Lukas Delayed soll improvement after dynamic compaction.Ground Improvement , Ground Reinforcement,Ground Treatment.Published by the ASCE,1997,pp409-420.
[18] K.W.Lo.et al.Unified Approach to Ground Improvement by Heavy Tamping.ASCE,GT3,1990,VII6(3):514?527.
[19]董耀.强夯加固软土地基的实践与机理[J].上海水利,1995(3),25?29.
[20]方永凯等.强夯法加固地基的若干问题[D].第六届全国土力学与基础工程学术讨论会论文集[C].上海:同济大学出版社,1991:573-575.
[21]王祈望,王仁刚,闫韶兵.动刚度和动力触探在强夯地基检测中的应用[J].岩土力学.2004(5):839-842.
[22]孔令伟,袁建新.强夯的边界接触应力与沉降特性研究[J].岩土工程学报,1998,20(2):86-92.
[23]李大忠.强夯处理湿陷性黄土的承载力计算方法[J].土工基础,2000,14(4).
[24]唐贤强,谢瑛等.地基工程原位测试技术[M].北京:中国铁道出版社,1993.
[25]林宗元.岩土工程试验监测手册[M].北京:中国建筑工业出版社,2005.
[26]林在贯等.岩土工程手册[M].北京:中国建筑工业出版社,1996.
[27]《工程地质手册》编委.《工程地质手册》(第四版)[M].北京:中国建筑工业出版社,2006.
[28]翟洪飞,高云等.载荷试验沉降与承压板尺寸关系的分析[J].西部探矿工程,2008,(10).
[29]李小勇.载荷板尺寸效应的试验研究[J].太原理工大学学报,2005,36(1).
[30]肖兵,张敏勇.平板载荷试验应思考的几个问题[J].岩土力学,2003,24(增刊).
[31]吕镇江.深层搅拌桩及高压旋喷桩复合地基载荷试验中压板面积问题的探讨[J].建筑科学,2001,17(5).
[32]钱家欢,殷宗泽.《土工原理与计算》[M].北京:水利水电出版社,1994.
[33] GB50007-2002.建筑地基基础设计规范[S].
[34]韩晓雷.非饱和沙漠地基土的理论和工程应用的研究[D].西安建筑科技大学,2004.
[35] GB50021-2001.《岩土工程勘察规范》[S].
[36] A.W.Skempton.Standard Penetration Test Proeedures and the Effeets in Sands of Overburden Pressure,Relative Density,Particle Size,Ageing and Over Consolidation[J].Geotechnique,1986,Vol.36,No.3:pp425-444.
[37]郭桂仁,标准贯入原位测试技术方法的分析与讨论[J].华北石油设计,2005(2):30-36.
[38] Terzaghi.K and Peck.R.B,Soil Meahanies in Engineering Practice,Inded,John Wiley, NewYork,1967.