福州地铁隧道冻结工程冻土物理力学性质研究
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摘要
冻土相关的物理力学参数是采用冻结法设计和施工的重要依据。为填补福州地区该类参数的空白,研究通过对福州地铁8种典型地层进行冻土物理力学试验,获得了这些地层的冻土物理力学参数。此外,通过对比发现冻土的物理力学参数与常规土工试验成果之间存在着对应关系,如第四系土层的比热、冻胀率、冻胀力等参数与含水量呈正比关系型,而与渗透系数、压缩模量之间呈反比关系。第四系土层的导热系数、冻结温度、冻土抗剪强度指标等参数与土的含水量呈反比关系型,而与渗透系数、压缩模量之间呈正比关系。处于原位风化的砂土状强风化花岗岩地层的导热系数、抗折强度明显优于第四系风化地层,而冻结温度、抗剪强度指标则无明显差异性特征。
The physical and mechanical parameters related to frozen soil are important basis for design and construction of freezing method.This paper chooses 8 typical strata of Fuzhou subway to carry out physical and mechanical tests on frozen soil. The physical and mechanical parameters of frozen soil in these strata are obtained through experiments,which fills the blanks of such parameters in Fuzhou area. In addition,it is found that there is a corresponding relationship between the physical and mechanical parameters of the frozen soil and the geotextile test results. For example,the specific heat,frost heave rate and frost heaving force of the Quaternary soil are proportional to the water content,but it is inversely related to the permeability coefficient and the compression modulus. The coefficient of thermal conductivity,freezing temperature and the shear strength index of the Quaternary soil are inversely proportional to the water content of the soil,but there is a positive relation to the permeability coefficient and the compression modulus. The thermal conductivity and flexural strength of the sandy soil strongly weathered granite in situ are obviously superior to those of the Quaternary weathered strata,but there is no obvious difference in the freezing temperature and shear strength.
The physical and mechanical parameters related to frozen soil are important basis for design and construction of freezing method.This paper chooses 8 typical strata of Fuzhou subway to carry out physical and mechanical tests on frozen soil. The physical and mechanical parameters of frozen soil in these strata are obtained through experiments,which fills the blanks of such parameters in Fuzhou area. In addition,it is found that there is a corresponding relationship between the physical and mechanical parameters of the frozen soil and the geotextile test results. For example,the specific heat,frost heave rate and frost heaving force of the Quaternary soil are proportional to the water content,but it is inversely related to the permeability coefficient and the compression modulus. The coefficient of thermal conductivity,freezing temperature and the shear strength index of the Quaternary soil are inversely proportional to the water content of the soil,but there is a positive relation to the permeability coefficient and the compression modulus. The thermal conductivity and flexural strength of the sandy soil strongly weathered granite in situ are obviously superior to those of the Quaternary weathered strata,but there is no obvious difference in the freezing temperature and shear strength.
引文
[1]铁道第四勘察设计院.福州市轨道交通网络规划[R]. 2012.
[2]郑志强.福州地铁规划建设中的水文地质环境问题分析[J].绿色科技,2013(11):153-156.
[3]李大勇.盾构机始发与到达端头土体加固分析[J].铁道工程学报,2006,04(01):87-90.
[4]康宝生.南京地铁盾构始发与到达施工技术[J].建筑机械化,2004,25(2):25-29.
[5]张婷,杨平.人工冻结法在地铁建设中的应用与发展[J].森林工程,2012,28(6):74-79.
[6]郑波,张建明,常小晓,等.广州地铁隧道冻结工程冻土力学特性试验研究[J].地下空间与工程学报,2007,10(3):893-897.
[7]张志强,何川.用冻结法修建地铁联络通道施工力学研究[J].岩石力学与工程学报,2005,24(18):3211-3217.
[8]编写组.井巷工程施工手册[M].北京:煤炭工业出版社,1980.
[9]张婷,杨平.不同因素对浅表土冻结温度的影响[J].南京林业大学学报(自然科学版),2009,33(04):132-134.
[10]吴紫汪,马巍.冻土强度与蠕变[M].兰州:兰州大学出版社,1994.
[2]郑志强.福州地铁规划建设中的水文地质环境问题分析[J].绿色科技,2013(11):153-156.
[3]李大勇.盾构机始发与到达端头土体加固分析[J].铁道工程学报,2006,04(01):87-90.
[4]康宝生.南京地铁盾构始发与到达施工技术[J].建筑机械化,2004,25(2):25-29.
[5]张婷,杨平.人工冻结法在地铁建设中的应用与发展[J].森林工程,2012,28(6):74-79.
[6]郑波,张建明,常小晓,等.广州地铁隧道冻结工程冻土力学特性试验研究[J].地下空间与工程学报,2007,10(3):893-897.
[7]张志强,何川.用冻结法修建地铁联络通道施工力学研究[J].岩石力学与工程学报,2005,24(18):3211-3217.
[8]编写组.井巷工程施工手册[M].北京:煤炭工业出版社,1980.
[9]张婷,杨平.不同因素对浅表土冻结温度的影响[J].南京林业大学学报(自然科学版),2009,33(04):132-134.
[10]吴紫汪,马巍.冻土强度与蠕变[M].兰州:兰州大学出版社,1994.