首页|Estimation of the unfrozen water content of saturated sandstones by ultrasonic velocity

Estimation of the unfrozen water content of saturated sandstones by ultrasonic velocity

扫码查看
原文链接
  • NETL
  • NSTL
  • 万方数据
  • 维普
The unfrozen water content(UWC)of rocks at low temperature is an important index for evaluating the stability of the rock engineering in cold regions and artificial freezing engineering.This study addresses a new method to estimate the UWC of saturated sandstones at low temperature by using the ultrasonic velocity.Ultrasonic velocity variations can be divided into the normal temperature stage(20 to 0℃),quick phase transition stage(0 to -5℃)and slow phase transition stage(-5 to -25℃).Most increment of ultrasonic velocity is completed in the quick phase transition stage and then turns to be almost a con-stant in the slow phase transition stage.In addition,the UWC is also measured by using nuclear magnetic resonance(NMR)technology.It is validated that the ultrasonic velocity and UWC have a similar change law against freezing and thawing temperatures.The WE(weighted equation)model is appropriate to es-timate the UWC of saturated sandstones,in which the parameters have been accurately determined rather than by data fitting.In addition,a linear relationship between UWC and ultrasonic velocity is built based on pore ice crystallization theory.It is evidenced that this linear function can be adopted to esti-mate the UWC at any freezing temperature by using P-wave velocity,which is simple,practical,and ac-curate enough compared with the WE model.

Ultrasonic velocityFreeze-thaw cyclesUnfrozen water contentPrediction functionHysteresis effect

Shibing Huang、Fei Liu、Gang Liu、Shilin Yu

展开 >

School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China

Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaProject of Natural Science Foundation of Hubei Province

42072300417022912021CFA094

2023

10.1016/j.ijmst.2023.02.003

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(6)
  • 6