海湾相有机质浸染砂的动力特性试验研究
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摘要
海南省沿海地区分布着一种特殊的海湾相有机质浸染砂,为研究其动力特性,利用动三轴仪进行了不同围压和含水率下的动力变形特性及动强度特性试验研究。分析含水率、围压对其动应力–动应变关系、动弹性模量、阻尼比的影响。试验结果表明:在动应变不变的条件下,动应力随含水率的增多而减小,随围压的增大而增大;动弹性模量在含水率变化时,变化趋势较平缓;阻尼比随着动应变的增加而增大,随含水率的增大而减小。在围压改变时,阻尼比的变化不明显。为海南省海湾相有机质浸染砂地区构筑物的动力计算参数的选取提供参考依据。
A special kind of bay facies organic sand is distributed in the coastal areas of Hainan Province. In order to study its dynamic characteristics, the tests on dynamic deformation and strength properties under different confining pressures and moisture contents are performed. The dynamic stress-dynamic strain relation, dynamic elastic modulus, damping ratio and dynamic strength of the samples under various moisture contents and confining pressures are analyzed. The tests indicate that,under the constant dynamic strain, the dynamic stress decreases with the increase of the moisture content and increases with the increase of the confining pressure. When the moisture content changes, the change trend of the dynamic elastic modulus is relatively gentle. The damping ratio increases with the dynamic strain and decreases with the moisture content. When the confining pressure changes, the damping ratio does not change obviously. It may provide a reference basis for the selection of dynamic parameters of structures in the bay facies organic sand-impregnated sand areas of Hainan Province.
A special kind of bay facies organic sand is distributed in the coastal areas of Hainan Province. In order to study its dynamic characteristics, the tests on dynamic deformation and strength properties under different confining pressures and moisture contents are performed. The dynamic stress-dynamic strain relation, dynamic elastic modulus, damping ratio and dynamic strength of the samples under various moisture contents and confining pressures are analyzed. The tests indicate that,under the constant dynamic strain, the dynamic stress decreases with the increase of the moisture content and increases with the increase of the confining pressure. When the moisture content changes, the change trend of the dynamic elastic modulus is relatively gentle. The damping ratio increases with the dynamic strain and decreases with the moisture content. When the confining pressure changes, the damping ratio does not change obviously. It may provide a reference basis for the selection of dynamic parameters of structures in the bay facies organic sand-impregnated sand areas of Hainan Province.
引文
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[3]刘汉龙.土动力学与土工抗震研究进展综述[J].土木工程学报,2012,45(4):148-164.(LIU Han-long.A review of recent advances in soil dynamics and geotechnical earthquake engineering[J].China Civil Engineering Journal,2012,45(4):148-164.(in Chinese))
[4]张建民.砂土动力学若干基本理论探究[J].岩土工程学报,2012,34(1):1-50.(ZHANG Jian-min.New advances in basic theories of sand dynamics[J].Chinese Journal of Geotechnical Engineering,2012,34(1):1-50.(in Chinese))
[5]褚峰,邵生俊,陈存礼.饱和淤泥质砂土动力变形及动强度特性试验研究[J].岩石力学与工程学报,2014,33(增1):3299-3305.(CHU Feng,SHAO Sheng-jun,CHENCun-li.Experimental study of dynamic deformation and dynamic strength properties of saturated silty sand[J].China Civil Engineering Journal,2014,33(S1):3299-3305.(in Chinese))
[6]王权民,李刚,陈正汉,等.厦门砂土的动力特性研究[J].岩土力学,2005,26(10):1628-1632.(WANG Quan-min,LIGang,CHEN Zheng-han et al.Research on dynamic characteristics of sands in Xiamen city[J].Rock and Soil Mechanics,2005,26(10):1628-1632.(in Chinese))
[7]王艳丽,胡勇.饱和砂土动力特性的动三轴试验研究[J].地下空间与工程学报,2010,6(2):295-299.(WANG Yan-li,HU Yong.Dynamic triaxial study on dynamic characteristics of saturated sands[J].Chinese Journal of Underground Space and Engineering,2010,6(2):295-299.(in Chinese))
[8]王海东,陈曦,李建文,等.大应变作用下含水率对非饱和砂土动力特性影响的研究[J].地震工程与工程振动,2016,36(1):193-199.(WANG Hai-dong,CHEN Xi,LIJian-wen,et al.Experimental study on the effect of water content on the dynamic characteristics of unsaturated sandy soil under large-strain[J].Earthquake Engineering and Engineering Dynamics,2016,36(1):193-199.(in Chinese))
[9]HU Jun,ZHANG Lei,WEI Hong,et al.Experimental study of the compressive strength of chemically reinforced organic-sandy soil[J].Geomechanics and Engineering,2018,16(3):247-255.
[10]YI Jun,WEI Hong.Existing form and causes of bay facies organic sand[J].Applied Mechanics and Materials,2013,(405/406/407/408):2730-2733.
[11]王志鑫.海湾相有机质侵染砂的成因与工程特性的实验室研究[D].海口:海南大学,2012.(WANG Zhi-xin.laboratory studies on the causes of infected gulf-phase organic sand and engineering properties[D].Haikou:Hainan University,2012.(in Chinese))
[12]胡勇士,卫宏,胡俊,等.海南有机质浸染砂变形特性研究[J].科学技术与工程,2015,15(35):58-63.(HUYong-shi,WEI Hong,HU Jun,et al.Study on the deformation property of organic infect sand in Hainan[J].Science Technology and Engineering,2015,15(35):58-63.(in Chinese))
[13]周志国,张云雁,符必昌,等.昆明长水国际机场砂页岩残积红土动力特性研究[J].地质力学学报,2018,24(6):795-802.(ZHOU Zhi-guo,ZHANG Yun-yan,FU Bi-chang,et al.A study on dynamic characte ristics of sandshale eluvial laterite at Kunming Changshui inter national airport[J].Journal of Geomechanics,2018,24(6):795-802.(in Chinese))