黑龙江冻结粉砂土动模量阻尼比试验研究
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摘要
通过GDS动三轴试验研究了冻结粉砂土动弹性模量与阻尼比与冻融次数、围压、频率的关系。试验表明:同一动应变下,动应力和围压、加载频率呈正相关性,与冻融次数呈负相关性;随着动应变增大,土体明显经历弹性、弹塑性两阶段,具有显著的非线性特征。随着冻融次数增加,土体强度降低,动模量减小,而阻尼比却持续增加并呈相互靠近趋势。随着围压增大,动模量增大但阻尼比减小。随着频率增大,动模量增大阻尼比随之减小,低频率对动模量影响明显,阻尼比在低频率也比高频率增长快。
The relationship between dynamic modulus of elasticity and damping ratio, freeze-thaw cycles,confining pressure and frequency of frozen silty soil were studied by GDS dynamic three axis test. The test results show that the dynamic stress is positively correlated with the confining pressure and loading frequency and is negative correlation with the number of freeze-thaw under the same dynamic strain. With the increase of the dynamic strain,the soil has obviously experienced two stages of elastic and elastoplastic,which has significant nonlinear characteristics. With the increase of freeze-thaw cycles,the dynamic modulus decreases and the damping ratio continues to increase and tend to be close to each other. With the increase of confining pressure,the dynamic modulus increases and the damping ratio decreases. With the increase of frequency,the dynamic modulus increases and the damping ratio decreases. Among them,the low frequency has obvious influence on the dynamic modulus,and the damping ratio also increases faster than the high frequency at low frequencies.
The relationship between dynamic modulus of elasticity and damping ratio, freeze-thaw cycles,confining pressure and frequency of frozen silty soil were studied by GDS dynamic three axis test. The test results show that the dynamic stress is positively correlated with the confining pressure and loading frequency and is negative correlation with the number of freeze-thaw under the same dynamic strain. With the increase of the dynamic strain,the soil has obviously experienced two stages of elastic and elastoplastic,which has significant nonlinear characteristics. With the increase of freeze-thaw cycles,the dynamic modulus decreases and the damping ratio continues to increase and tend to be close to each other. With the increase of confining pressure,the dynamic modulus increases and the damping ratio decreases. With the increase of frequency,the dynamic modulus increases and the damping ratio decreases. Among them,the low frequency has obvious influence on the dynamic modulus,and the damping ratio also increases faster than the high frequency at low frequencies.
引文
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[14]王丽霞,胡庆立,凌贤长,等.青藏铁路重塑冻结粉质黏土动剪切模量试验研究[J].地震工程与工程振动,2007,27(2):177-180.
[15]徐春华,徐学燕,邱明国,等.循环荷载下冻土的动阻尼比试验研究[J].哈尔滨建筑大学学报,2002,35(6):22-25.
[16]于琳琳,徐学燕,邱明国,等.冻融作用对饱和粉质黏土抗剪性能的影响[J].岩土力学,2010,31(8):2448-2452.
[17]于啸波,孙锐,袁晓铭,等.负温对土动剪切模量阻尼比的影响规律[J].岩石力学与工程学报,2016,35(7):1452-1465.
[18]张锋,冯德成,凌贤长,等.长平高速公路典型原状粉质黏土静动力学特性[J].哈尔滨工业大学学报,2012,44(8):11-16.
[19]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.
[20]孙静,熊宏强,公茂盛,等.土的动剪切模量非线性特性对地震动的影响研究[J].地震工程与工程振动,2018,38(2):28-34.
[2]李小晗,史长莹,芒来.季节冻土堤防原位监测与数值模拟分析[J].黑龙江大学工程学报,2018,9(1):1-6.
[3] Christ M,Kim Y C,Park J B. The influence of temperature and cycles on acoustic and mechanical properties of frozen soils[J]. KSCE Journal of Civil Engineering,2009,13(3):153-159.
[4] Shelman A,Tantalla J,Sritharan S,et al. Characterization of seasonally frozen soils for seismic design of foundations[J]. Journal of Geotechnical&Geoenvironmental Engineering,2014,140(7):1943-5606.
[5]凌贤长,王子玉,张锋,等.京哈铁路路基冻结粉质黏土动剪切模量试验研究[J].岩土工程学报,2013,35(S2):38-43.
[6]马玉涛,崔宏环,刘建坤,等.冻融循环后路基粉质黏土动力特性研究[J].低温建筑技术,2017,39(1):81-83,85.
[7] Kallioglou P,Tika T H,Pitilaki K. Shear modulus and damping ratio of cohesive soils[J]. Journal of Earthquake Engineering,2008,12(6):879-913.
[8] Lu T,Huo J,Rong M. Nonlinear response analysis of soil layers under severe earthquake[J]. Procedia Environmental Sciences,2012,12(4):940-948.
[9] Jaya V,Dodagoudar G R,Boominathan A. Modulus reduction and damping curves for sand of south-east coast of India[J].Journal of Earthquake and Tsunami,2013,6(4):389-396.
[10]何菲,王旭,刘德仁,等.青藏铁路原状冻结砂土动力特性参数试验研究[J].铁道学报,2017,39(6):112-117.
[11]严晗,王天亮,刘建坤,等.反复冻融条件下粉砂土动力学参数试验研究[J].岩土力学,2014,35(3):683-688.
[12]赵淑萍,朱元林,何平,等.冻土动力学参数测试研究[J].岩石力学与工程学报,2003,22(S2):2677-2681.
[13]许阳,朱占元.冻土路基粉质黏土动力学特性试验研究[J].山西建筑,2014,40(9):39-42.
[14]王丽霞,胡庆立,凌贤长,等.青藏铁路重塑冻结粉质黏土动剪切模量试验研究[J].地震工程与工程振动,2007,27(2):177-180.
[15]徐春华,徐学燕,邱明国,等.循环荷载下冻土的动阻尼比试验研究[J].哈尔滨建筑大学学报,2002,35(6):22-25.
[16]于琳琳,徐学燕,邱明国,等.冻融作用对饱和粉质黏土抗剪性能的影响[J].岩土力学,2010,31(8):2448-2452.
[17]于啸波,孙锐,袁晓铭,等.负温对土动剪切模量阻尼比的影响规律[J].岩石力学与工程学报,2016,35(7):1452-1465.
[18]张锋,冯德成,凌贤长,等.长平高速公路典型原状粉质黏土静动力学特性[J].哈尔滨工业大学学报,2012,44(8):11-16.
[19]吴志坚,王兰民,马巍,等.地震荷载作用下冻土的动力学参数试验研究[J].西北地震学报,2003,25(3):210-214.
[20]孙静,熊宏强,公茂盛,等.土的动剪切模量非线性特性对地震动的影响研究[J].地震工程与工程振动,2018,38(2):28-34.