青藏铁路重塑冻结粉质黏土动剪切模量试验研究
摘要
通过低温动三轴试验,研究青藏铁路中重塑冻结粉质黏土的动剪切模量的变化规律及其主要因素。研究表明,冻土的最大动剪切模量随负温降低而显著增大,动剪切模量比随轴向荷载单级振次增加而有所增大,随负温降低而降低,随围压增加趋于一致。负温是冻土动力性能的一个极其重要的影响因素,因而寒区工程应引起足够的重视。研究结果对于合理认识冻土动力性能具有一定意义,也为进一步开展多年冻土场地工程地震安全性评价积累部分基础资料。
The dynamic shear modulus variation and its main affecting factors are studied on the basis of the results of low-temperature dynamic triaxial test of frozen silty clay with remolded samples taken from Qinghai-Xizang Railway.It is indicated that the maximum dynamic shear modulus increases evidently with temperature decreasing.Dynamic modulus ratio increases with axial vibration times increasing,decreases with temperature decreasing.Shear modulus ratio does not vary evidently with confining pressure increasing.Temperature is one of the main affecting factors of dynamic properties of frozen soil,so full regard should be paid to cold region engineering.It is benefit to acknowledge the dynamic property of frozen soil.It also provides some important data for further developing engineering earthquake security evaluation in permafrost region.
The dynamic shear modulus variation and its main affecting factors are studied on the basis of the results of low-temperature dynamic triaxial test of frozen silty clay with remolded samples taken from Qinghai-Xizang Railway.It is indicated that the maximum dynamic shear modulus increases evidently with temperature decreasing.Dynamic modulus ratio increases with axial vibration times increasing,decreases with temperature decreasing.Shear modulus ratio does not vary evidently with confining pressure increasing.Temperature is one of the main affecting factors of dynamic properties of frozen soil,so full regard should be paid to cold region engineering.It is benefit to acknowledge the dynamic property of frozen soil.It also provides some important data for further developing engineering earthquake security evaluation in permafrost region.
引文
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[13]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202-205.
[14]王丽霞,凌贤长,胡庆立,等.相似方法在冻土抗剪强度低温三轴试验研究中应用[J].岩石力学与工程学报.2005,24(增1):5183-5188.
[15]王丽霞,凌贤长.冻土路基地震破坏判别方法研究[J].岩石力学与工程学报,2005,24(4).638-642.
[2]张克绪,谢君斐.土动力学[M].北京:地震出版社,1989.
[3]陈国兴,朱定华,何启智.GZZ-1型自振柱试验机研制与性能试验[J].地震工程与工程振动,2003,23(1):110-114.
[4]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000,20(4):133-139.
[5]刘雪珠,陈国兴,胡庆兴.南京地区新近沉积土的动剪切模量和阻尼比的初步研究[J].地震工程与工程振动,2002,22(5):127-131.
[6]胡庆兴,刘雪珠,从卫民.淮安市典型土动力特性的试验研究[J].地震工程与工程振动,2003,23(6):127-131.
[7]吴志坚,马巍,王兰民,等.地震荷载作用下冻土的动力学参数试验研究[C]//中国科学院兰州冰川冻土研究所冻土工程国家重点实验室年报.兰州:2002,12:77-84.
[8]何平,朱元林,常小晓.冻土的变形性能与泊松比[J].地下空间,1999.19(5):115-118.
[9]凌贤长,徐学燕,徐春华,等.冻结哈尔滨粉质黏土超声波速测定试验研究[J].岩土工程学报,2002,24(4):456-459.
[10]王丽霞,凌贤长,刘红艳,等.多年冻土场地路基地震响应位移性状研究[J].世界地震工程,2004,20(2):112-116.
[11]王丽霞,凌贤长,徐学燕,等.多年冻土场地路基地震加速度反应谱特性研究[J].岩石力学与工程学报,2004,23(8):1330-1335.
[12]王丽霞,凌贤长,徐学燕,等.多年冻土场地路基地震响应动应力性状研究[J].地震工程与工程振动,2004,24(4):117-121.
[13]王丽霞,凌贤长,徐学燕,等.青藏铁路冻结粉质黏土动静三轴试验对比[J].岩土工程学报,2005,27(2):202-205.
[14]王丽霞,凌贤长,胡庆立,等.相似方法在冻土抗剪强度低温三轴试验研究中应用[J].岩石力学与工程学报.2005,24(增1):5183-5188.
[15]王丽霞,凌贤长.冻土路基地震破坏判别方法研究[J].岩石力学与工程学报,2005,24(4).638-642.
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