冻结时间对冻土抗压强度影响的试验分析
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摘要
为了研究不同冻结时间及含水率对冻结粉质黏土无侧限抗压强度的影响,在负温条件下对不同含水率粉质黏土进行了不同冻结时间的无侧限抗压强度试验。结果表明随着冻结时间的增加,冻结粉质黏土无侧限抗压强度逐渐增大且增大趋势逐渐减小,应力-应变曲线的弹性段得到延长,应力达到峰值后下降段斜率逐渐增大,表现出依赖于冻结时间的冻脆性特征;在17%～29%范围内,随着含水率的增大,无侧限抗压强度逐渐降低,破坏应变逐渐增大,破坏形式由脆性破坏向塑性破坏转变。
In order to study the effect of different freezing time and water content on the unconfined compressive strength of frozen silty clay, the unconfined compressive strength tests of silty clay with different water contents under different freezing time were carried out under the negative temperature conditions. The results show that with the increase of freezing time, the unconfined compressive strength of frozen silty clay gradually increased while its increasing tendency decreased; the elastic section of stress-strain curve was extended, and the slope of the descending section gradually increased after reaching the stress peak. The freezing-brittleness characteristics that depend on the freezing time were exhibited. In the range of 17%～29%, with the increase of water content, the unconfined compressive strength gradually decreased, the failure strain increased gradually, and the failure mode changed from brittle failure to plastic failure.
In order to study the effect of different freezing time and water content on the unconfined compressive strength of frozen silty clay, the unconfined compressive strength tests of silty clay with different water contents under different freezing time were carried out under the negative temperature conditions. The results show that with the increase of freezing time, the unconfined compressive strength of frozen silty clay gradually increased while its increasing tendency decreased; the elastic section of stress-strain curve was extended, and the slope of the descending section gradually increased after reaching the stress peak. The freezing-brittleness characteristics that depend on the freezing time were exhibited. In the range of 17%～29%, with the increase of water content, the unconfined compressive strength gradually decreased, the failure strain increased gradually, and the failure mode changed from brittle failure to plastic failure.
引文
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[15]杜海民,马巍,张淑娟,等.围压与含水率对冻结砂土破坏应变能密度影响特性研究[J].岩土力学,2017,38(7):1 943-1 950.
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[18]胡田飞,刘建坤,房建宏,等.冻融循环下冷却温度对粉质黏土力学性质影响的试验研究[J].岩石力学与工程学报,2017,36(7):1 757-1 767.
[19]曹成,陆建飞,李清涛.室内土体单向冻结水分迁移的试验研究[J].科学技术与工程,2015,15(9):114-118.
[2]杨平,佘才高,董朝文,等.人工冻结法在南京地铁张府园车站的应用[J].岩石力学,2003(S2):388-391.
[3]YANG YUGUI,GAO FENG,CHENG HONGMEI,et al.Energy dissipation and failure criterion of artificial frozen soil[J].Cold Regions Science and Technology,2016,129:137-144.
[4]KOJIMA Y,HEITMAN J L,NOBORIO K,et al.Sensitivity analysis of temperature changes for determining thermal properties of partially frozen soil with a dual probe heat pulse sensor[J].Cold Regions Science and Technology,2018,151:188-195.
[5]TANG LIYUN,WANG KE,JIN LONG,et al.A resistivity model for testing unfrozen water content of frozen soil[J].Cold Regions Science and Technology,2018,153:55-63.
[6]马芹永.人工冻结法的理论与施工技术[M].北京:人民交通出版社,2007:8-200.
[7]杜海民,马巍,张淑娟,等.应变率与含水率对冻土单轴压缩特性影响研究[J].岩土力学,2016,37(5):1 373-1 379.
[8]牛亚强,赖远明,王旭,等.初始含水率对冻结粉质黏土变形和强度的影响规律研究[J].岩土力学,2016,37(2):499-506.
[9]马小杰,张建明,常小晓,等.高温-高含冰量冻结黏土强度试验研究[J].岩土力学,2008,29(9):2 498-2 502.
[10]马芹永.人工冻土单轴抗拉、抗压强度的试验研究[J].岩土力学,1996,17(3):76-81.
[11]黄星,李东庆,明锋,等.冻土的单轴抗压、抗拉强度特性试验研究[J].冰川冻土,2016,38(5):1 346-1 352.
[12]闫澍旺,李康,邱长林.天津滨海新区人工冻结粉质黏土强度特性试验研究[J].科学技术与工程,2017,17(3):282-287.
[13]蔡正银,吴志强,黄英豪,等.含水率和含盐量对冻土无侧限抗压强度影响的试验研究[J].岩土工程学报,2014,36(9):1 580-1 586.
[14]蔡正银,吴志强,黄英豪,等.冻土单轴抗压强度影响因素的试验研究[J].冰川冻土,2015,37(4):1 002-1 008.
[15]杜海民,马巍,张淑娟,等.围压与含水率对冻结砂土破坏应变能密度影响特性研究[J].岩土力学,2017,38(7):1 943-1 950.
[16]陈柏生,胡时胜,马芹永,等.冻土动态力学性能的实验研究[J].力学学报,2005,37(6):54-58.
[17]王大雁,马巍,常小晓,等.冻融循环作用对青藏粘土物理力学性质的影响[J].岩石力学与工程学报,2005,24(23):4 313-4 319.
[18]胡田飞,刘建坤,房建宏,等.冻融循环下冷却温度对粉质黏土力学性质影响的试验研究[J].岩石力学与工程学报,2017,36(7):1 757-1 767.
[19]曹成,陆建飞,李清涛.室内土体单向冻结水分迁移的试验研究[J].科学技术与工程,2015,15(9):114-118.