某高速铁路动车段地基处理沉降研究分析
|
摘要
为满足某境外高速铁路动车段淤泥质土地基的不同沉降要求,选出最优工程方案,首先根据工程地质条件、铁路等级以及工期等因素筛选适用于该动车段的地基处理方法;之后,根据地层条件和地基处理工程经验拟定各区域加固深度;最后,通过造价比较,确定各区域的最佳地基处理方案。研究分析结果表明:适用于该动车段淤泥质土的地基处理方法有水泥土搅拌桩、预应力管桩以及塑料排水板。沉降要求为300 mm的区域Ⅰ,采用长16 m、间距1. 2 m、桩径0. 5 m的水泥土搅拌桩复合地基;沉降要求为15 mm的区域Ⅱ,采用长24 m、外径0. 4 m、桩间距1. 3 m的预应力管桩;沉降要求为400 mm的区域Ⅲ,采用深度为14 m、间距1. 0 m的塑料排水板结合堆载预压。
In order to meet different settlement requirements for the silt foundation of a certain oversea highspeed railway EMU depot and select the optimal engineering plan,this paper has done the main work as follows. First of all,according to the engineering geological conditions,railway grade and construction period,the foundation treatment methods applicable to the EMU depot are screened. Then,foundation reinforcement depth of each area is drafted based on the formation conditions and engineering experience of foundation treatment. Finally,the optimal foundation treatment plan for each area is determined by comparing project costs of each plan. The result of this research shows that the foundation treatment methods suitable for the silt foundation of this EMU depot include cement soil mixing pile,prestressed RC pipe pile and plastic drainage board. Area Ⅰ with a settlement requirement of 300 mm adopts a composite foundation of cement-soil mixing piles with a length of 16 m,a spacing of 1. 2 m and a pile diameter of 0. 5 m; area Ⅱ with a settlement requirement of 15 mm adopts prestressed RC pipe piles with a length of 24 m,an outer diameter of 0. 4 m and a pile spacing of 1. 3 m; areaⅢ with a settlement requirement of 400 mm adopts plastic drainage boards with a depth of 14 m and a spacing of 1. 0 m combined with preloading.
In order to meet different settlement requirements for the silt foundation of a certain oversea highspeed railway EMU depot and select the optimal engineering plan,this paper has done the main work as follows. First of all,according to the engineering geological conditions,railway grade and construction period,the foundation treatment methods applicable to the EMU depot are screened. Then,foundation reinforcement depth of each area is drafted based on the formation conditions and engineering experience of foundation treatment. Finally,the optimal foundation treatment plan for each area is determined by comparing project costs of each plan. The result of this research shows that the foundation treatment methods suitable for the silt foundation of this EMU depot include cement soil mixing pile,prestressed RC pipe pile and plastic drainage board. Area Ⅰ with a settlement requirement of 300 mm adopts a composite foundation of cement-soil mixing piles with a length of 16 m,a spacing of 1. 2 m and a pile diameter of 0. 5 m; area Ⅱ with a settlement requirement of 15 mm adopts prestressed RC pipe piles with a length of 24 m,an outer diameter of 0. 4 m and a pile spacing of 1. 3 m; areaⅢ with a settlement requirement of 400 mm adopts plastic drainage boards with a depth of 14 m and a spacing of 1. 0 m combined with preloading.
引文
[1]张丽娟,李彰明,韩江.动静力排水固结法在淤泥质地基处理工程中的应用[J].岩土力学,2009(2):567-571.
[2]薛元,崔维秀,封志军,等.滇池地区铁路软土地基加固处理技术[J].铁道工程学报,2015(8):35-40.
[3]王志伟.预应力管桩桩网结构在昆玉铁路的实践[J].高速铁路技术,2013(5):72-76
[4]中华人民共和国铁道部. TB10102—2010铁路工程土工试验规程[S].北京:中国铁道出版社,2010.
[5]中华人民共和国住房和城乡建设部. GB50007—2011建筑地基基础设计规范[S].北京:中国建筑工业出版社,2011.
[6]中华人民共和国铁道部. TB10106—2010铁路工程地基处理技术规程[S].北京:中国铁道出版社,2010.
[7]朱献文,陈青倩,姜百祥.塑料排水板超载预压排水固结法在某地基处理工程中的应用[J].施工技术,2012(13):36-45.
[8]谷世平,程玉泉,王铁法.路桥过渡段复合软基处理技术[J].公路,2018,63(11):164-167.
[9]吴红刚,冯帅,李慈航,等.铁路既有线斜向旋喷桩复合地基试验研究[J].铁道工程学报,2018,35(9):1-8,30.
[10]严栋.改进的分层总和法在铁路地基沉降中的应用[J].铁道工程学报,2010(10):26-29.
[11]彭长学,杨光华.软土e-p曲线确定的简化方法及在非线性沉降计算中的应用[J].岩土力学,2008(6):1706-1710.
[12]李广信.高等土力学[M].北京:清华大学出版社,2004.
[13] A. Casagrande,The Determination of the Pre-Concolidation Load and Its Practical Influence[C]. Proceeding 1st International Conference on Soil,Mechnical and Foundation Engineering,Boston,1936.
[14]刘用海,朱向荣,常林越.基于Casagrande法数学分析确定先期固结压力[J].岩土力学,2009(1):211-220.
[15]高大钊.土力学与岩土工程师[M].北京:人民交通出版社,2009.
[16]程培峰,李灵芝,刘红军.袋装砂井与塑料排水板处理软基的对比评价[J].路基工程,2008(1):50-52.
[2]薛元,崔维秀,封志军,等.滇池地区铁路软土地基加固处理技术[J].铁道工程学报,2015(8):35-40.
[3]王志伟.预应力管桩桩网结构在昆玉铁路的实践[J].高速铁路技术,2013(5):72-76
[4]中华人民共和国铁道部. TB10102—2010铁路工程土工试验规程[S].北京:中国铁道出版社,2010.
[5]中华人民共和国住房和城乡建设部. GB50007—2011建筑地基基础设计规范[S].北京:中国建筑工业出版社,2011.
[6]中华人民共和国铁道部. TB10106—2010铁路工程地基处理技术规程[S].北京:中国铁道出版社,2010.
[7]朱献文,陈青倩,姜百祥.塑料排水板超载预压排水固结法在某地基处理工程中的应用[J].施工技术,2012(13):36-45.
[8]谷世平,程玉泉,王铁法.路桥过渡段复合软基处理技术[J].公路,2018,63(11):164-167.
[9]吴红刚,冯帅,李慈航,等.铁路既有线斜向旋喷桩复合地基试验研究[J].铁道工程学报,2018,35(9):1-8,30.
[10]严栋.改进的分层总和法在铁路地基沉降中的应用[J].铁道工程学报,2010(10):26-29.
[11]彭长学,杨光华.软土e-p曲线确定的简化方法及在非线性沉降计算中的应用[J].岩土力学,2008(6):1706-1710.
[12]李广信.高等土力学[M].北京:清华大学出版社,2004.
[13] A. Casagrande,The Determination of the Pre-Concolidation Load and Its Practical Influence[C]. Proceeding 1st International Conference on Soil,Mechnical and Foundation Engineering,Boston,1936.
[14]刘用海,朱向荣,常林越.基于Casagrande法数学分析确定先期固结压力[J].岩土力学,2009(1):211-220.
[15]高大钊.土力学与岩土工程师[M].北京:人民交通出版社,2009.
[16]程培峰,李灵芝,刘红军.袋装砂井与塑料排水板处理软基的对比评价[J].路基工程,2008(1):50-52.