饱和土体热-水-力-化全耦合一维溶质运移模型

基于孔隙流体质量守恒、能量守恒和溶质质量守恒,综合考虑力学固结、热固结与化学渗透固结对土体结构的影响,并结合黏土颗粒对溶质吸附、半透膜效应作用及耦合流、耦合扩散效应,建立了单一溶质在饱和土体中运移的热-水-力-化全耦合分析模型,采用COMSOL软件重点模拟了渗滤液环境温度对溶质运移行为的影响.数值结果表明,温度会显著影响溶质浓度随时空的分布,热扩散作用加速溶质运移进程,热渗透与热固结机制对溶质运移具有阻滞作用,模拟时间为50年时黏土垫层上下边界温差70 K比无温差工况溶质运移深度减缓87.6%.所建全耦合模型能够为填埋场防渗隔污屏障优化设计及服役性能评估提供理论参考.

地质系统THMC耦合随机模型研究

热-水-力-化(THMC)耦合作用是岩石流体力学与环境地质中的重要理论课题.设计用实验方法研究温度场-渗流场-应力场-化学场四场耦合效应中热传导系数、渗透率及岩体变形参数的空间变异性表征方法,及块裂岩体的非确定性耦合控制方程,试图建立热-水-力-化耦合作用的随机性数学模型及可视化数值模拟方法,为核废料地质处置安全性评价和地下水资源评价等提供科学的新方法.

A new measurement method of crack propagation rate for brittle rock under THMC coupling condition

A new electrical method of conductive carbon-film(with waterproof and anticorrosion ability)was proposed to continuously measure crack propagation rate of brittle rock under THMC coupling condition.A self-designed coupling testing system was used to conduct THMC coupling fracture tests of the pre-cracked red sandstone specimens(where the temperature is only changed)by this new electrical method of conductive carbon-film.Calculation results obtained by the energy method coincide well with the test results.And the higher the temperature is,the earlier the crack is initiated and the larger the crack propagation rate and accelerated velocity are,which can prove the validity of the new electrical method.This new electrical method has advantages of continuously measuring crack propagation rate over the conventional electrical,optical and acoustic methods,and can provide important basis for safety assessment and cracking-arrest design of deep rock mass engineering.