阳江地区海积软土工程特性研究
|
摘要
通过对阳江地区海积软土进行试验研究得出,该区域软土具有较高的结构强度,为一种典型的结构性土,属中等灵敏度;当原状土样在低于60 kPa围压作用时,应力-应变曲线表现出应变软化,增加围压,土样固结时结构强度受到破坏,应变软化逐渐减弱,相应重塑土样的应力-应变关系曲线呈应变硬化型;海积软土的组成物质、孔隙结构、土壤颗粒间的连结方式,以及粘土中粘粒和粉粒在盐类和有机质的作用下形成结构强度造就了阳江地区海积软土具有结构强度。本文研究的方法和结论可为其它地区海积软土工程特性研究和应用提供参考。
Through the experimental study on the marine soft soil in Yangjiang area, it is concluded that the soft soil in this area has high structural strength and is a typical structural soil with moderate sensitivity; when the confining pressure is below 60 kPa, the stress-strain curve of undisturbed soil shows strain softening. With the increase of confining pressure, the structural strength of soil will be damaged during consolidation, which will weaken the strain softening, the strain softening gradually weakens, and the stress-strain relationship curve of the corresponding remolded soil samples shows strain hardening type. The structural strength of marine soft soil in Yangjiang area is attributed to its composition, pore structure, the connection between soil particles, and the formation of structural strength of clay and silt particles under the action of salts and organic matter. The research methods and conclusions in this paper can provide reference for the study and application of engineering characteristics of marine soft soil in other areas.
Through the experimental study on the marine soft soil in Yangjiang area, it is concluded that the soft soil in this area has high structural strength and is a typical structural soil with moderate sensitivity; when the confining pressure is below 60 kPa, the stress-strain curve of undisturbed soil shows strain softening. With the increase of confining pressure, the structural strength of soil will be damaged during consolidation, which will weaken the strain softening, the strain softening gradually weakens, and the stress-strain relationship curve of the corresponding remolded soil samples shows strain hardening type. The structural strength of marine soft soil in Yangjiang area is attributed to its composition, pore structure, the connection between soil particles, and the formation of structural strength of clay and silt particles under the action of salts and organic matter. The research methods and conclusions in this paper can provide reference for the study and application of engineering characteristics of marine soft soil in other areas.
引文
[1]房后国.天津地区海积软土结构强度及其对力学特性的影响[J].吉林大学学报, 2002,(01):73-76.
[2]王国欣.原状结构性土先期固结压力及结构强度的确定[J].岩土工程学报, 2003,(02):249-251.
[3]韩爱民.三轴压缩下南京下蜀土的宏、微观性状试验[J].吉林大学学报, 2013,(06):1897-1903.
[4]王国欣.杭州海积软土应力–应变特征与结构强度损伤规律研究[J].岩石力学与工程学报,2005,(05):1555-1560.
[5]拓勇飞.湛江地区结构性软土的赋存规律及其工程特性[J].岩土力学, 2004,(12):1879-1884.
[6]王冠英.海积软土前期固结压力与结构强度的关系及成因分析[J].世界地质, 2004,(03):69-74.
[7]孔令伟.海口某海域软土工程特性的微观机制浅析[J].岩土力学, 2002, 23(1):36-40.
[8]冯晓腊.论深圳淤泥类软土微观结构对工程性质的影响[J].中国地质灾害与防治学报, 1996,(9):34-39.
[9]李作勤.有结构强度的欠压密土的力学特性[J].岩土工程学报, 1982, 4(1):34-45.
[2]王国欣.原状结构性土先期固结压力及结构强度的确定[J].岩土工程学报, 2003,(02):249-251.
[3]韩爱民.三轴压缩下南京下蜀土的宏、微观性状试验[J].吉林大学学报, 2013,(06):1897-1903.
[4]王国欣.杭州海积软土应力–应变特征与结构强度损伤规律研究[J].岩石力学与工程学报,2005,(05):1555-1560.
[5]拓勇飞.湛江地区结构性软土的赋存规律及其工程特性[J].岩土力学, 2004,(12):1879-1884.
[6]王冠英.海积软土前期固结压力与结构强度的关系及成因分析[J].世界地质, 2004,(03):69-74.
[7]孔令伟.海口某海域软土工程特性的微观机制浅析[J].岩土力学, 2002, 23(1):36-40.
[8]冯晓腊.论深圳淤泥类软土微观结构对工程性质的影响[J].中国地质灾害与防治学报, 1996,(9):34-39.
[9]李作勤.有结构强度的欠压密土的力学特性[J].岩土工程学报, 1982, 4(1):34-45.