张 坤,张 泽,史向阳,等.动荷载下土体温度和孔隙水压力的变化规律[J].深圳大学学报理工版,2018,35(No.2(111-220)):111-118.[doi:10.3724/SP.J.1249.2018.02111]
ZHANG Kun,ZHANG Ze,SHI Xiangyang,et al.The temperature and pore water pressure in soil subjected to dynamic load[J].Journal of Shenzhen University Science and Engineering,2018,35(No.2(111-220)):111-118.[doi:10.3724/SP.J.1249.2018.02111]
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动荷载下土体温度和孔隙水压力的变化规律
张 坤1,张 泽2,史向阳2,3,李四海4,肖东辉2,3

1)甘肃省交通科学研究院有限公司,甘肃兰州730070; 2)中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州 730000; 3)中国科学院大学,北京 100049; 4)青海省盐业股份有限公司茶卡制盐分公司,青海海西 817101

岩土工程; 冻融循环; 动荷载; 土体温度; 水分迁移; 孔隙水压力

The temperature and pore water pressure in soil subjected to dynamic load
ZHANG Kun1, ZHANG Ze2, SHI Xiangyang2, 3, LI Sihai4, and XIAO Donghui2, 3

1)Gansu Transportation Research Institute Co. Ltd., Lanzhou 730070, Gansu Province, P.R.China2)State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu Province, P.R.China3)University of Chinese Academy of Sciences, Beijing 100049, P.R.China4)Chaka Salt Branch, Qinghai Salt Industry Co. Ltd., Haixi 817101, Qinghai Province, P.R.China

geotechnical engineering; freeze-thaw cycle; dynamic load; soil temperature; moisture migration; pore water pressure

DOI: 10.3724/SP.J.1249.2018.02111

备注

动荷载对土体的挤压作用能够改变土体内部孔隙的大小,进而导致土体内部孔隙水压力发生变化. 为了验证该物理过程,通过模型试验,研究冻融循环作用下无荷载和动荷载时土体温度和孔隙水压力的变化规律.结果表明,冻融循环作用下,当外部温度达到最高值时,土体上部0～10 cm和底部20～40 cm范围内的等温线密集,温度梯度较大,而10～20 cm范围内的等温线较稀疏,温度梯度较小; 当温度达到最低值时,土体内部等温线分布均匀. 在无荷载条件下,土体内部孔隙水压力随冻融次数增加呈增大趋势,动荷载条件下亦呈现同样规律. 动荷载引起土体内部孔隙水压力在冻融过程中发生变化,在冻融初期,振动底板下方5 cm范围内的孔隙水压力为正值,其他区域为负值.随着冻融循环次数的增加,振动底板下方正孔隙水压力的范围扩大到10 cm,而且在振动底板下方20 cm处出现高孔隙水压力区域.

The pore scale and pore water pressure in soil change with the compression of dynamic load. The changes of the temperature and the pore water pressure in soil were studied with and without the dynamic load. The results indicate that the isotherms at the upper part of the soil(0～10 cm)and at the bottom part(20～40 cm)are intensively dense and temperature gradients are large, but isotherms are sparse and temperature gradients are small at the scope of 10～20 cm, when the temperature reaches the maximum value; the isotherms in soil distribute uniformly when the temperature reaches the minimum value. The pore water pressure increases with the increasing numbers of freezing-thawing cycles under the conditions of no load and the dynamic load. In the early freezing-thawing, the values of pore water pressures in soil is positive in the range of 0-5 cm below the vibration plate, and they are negative in other regions. With the increasing numbers of freezing-thawing cycles, the region of the positive pore water pressure under the vibration plate extends to the depth of 10 cm, and the high pore water pressure area appears at the depth of 20 cm under the vibration plate.

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