岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
5期
1461-1469
,共9页
压力溶解%颗粒聚集岩体%热-水-应力耦合%数值模拟
壓力溶解%顆粒聚集巖體%熱-水-應力耦閤%數值模擬
압력용해%과립취집암체%열-수-응력우합%수치모의
pressure solution%granule aggregate rock%thermo-hydro-mechanical coupling%numerical simulation
在自主研制的孔隙介质热-水-应力耦合有限元程序中引入Taron等提出的颗粒聚集体的压力溶解模型，针对一个假设的实验室尺度且位于非饱和石英颗粒聚集岩体中的高放废物地质处置模型，拟定两种计算工况：（1）孔隙率和渗透系数是压力溶解的函数；（2）孔隙率和渗透系数均为常数，进行4 a处置时段的数值模拟，考察了岩体中的温度、颗粒界面水膜及孔隙中的溶质浓度、迁移和沉淀质量、孔隙率及渗透系数、孔隙水压力、地下水流速和应力的变化、分布情况。研究结果表明：工况1计算终了时，压力溶解使得孔隙率和渗透系数分别下降到初始值的43%～54%、4.4%～9.1%。在核废料释热温度场的作用下，工况1、2中的负孔隙水压力分别为初始值的1.00～1.25倍、1.00～1.10倍，前者表现了压力溶解的明显影响；两种工况的岩体中的应力量值及分布基本相同。
在自主研製的孔隙介質熱-水-應力耦閤有限元程序中引入Taron等提齣的顆粒聚集體的壓力溶解模型，針對一箇假設的實驗室呎度且位于非飽和石英顆粒聚集巖體中的高放廢物地質處置模型，擬定兩種計算工況：（1）孔隙率和滲透繫數是壓力溶解的函數；（2）孔隙率和滲透繫數均為常數，進行4 a處置時段的數值模擬，攷察瞭巖體中的溫度、顆粒界麵水膜及孔隙中的溶質濃度、遷移和沉澱質量、孔隙率及滲透繫數、孔隙水壓力、地下水流速和應力的變化、分佈情況。研究結果錶明：工況1計算終瞭時，壓力溶解使得孔隙率和滲透繫數分彆下降到初始值的43%～54%、4.4%～9.1%。在覈廢料釋熱溫度場的作用下，工況1、2中的負孔隙水壓力分彆為初始值的1.00～1.25倍、1.00～1.10倍，前者錶現瞭壓力溶解的明顯影響；兩種工況的巖體中的應力量值及分佈基本相同。
재자주연제적공극개질열-수-응력우합유한원정서중인입Taron등제출적과립취집체적압력용해모형，침대일개가설적실험실척도차위우비포화석영과립취집암체중적고방폐물지질처치모형，의정량충계산공황：（1）공극솔화삼투계수시압력용해적함수；（2）공극솔화삼투계수균위상수，진행4 a처치시단적수치모의，고찰료암체중적온도、과립계면수막급공극중적용질농도、천이화침정질량、공극솔급삼투계수、공극수압력、지하수류속화응력적변화、분포정황。연구결과표명：공황1계산종료시，압력용해사득공극솔화삼투계수분별하강도초시치적43%～54%、4.4%～9.1%。재핵폐료석열온도장적작용하，공황1、2중적부공극수압력분별위초시치적1.00～1.25배、1.00～1.10배，전자표현료압력용해적명현영향；량충공황적암체중적응역량치급분포기본상동。
The model of pressure solution for granular aggregates established by Taron et al is introduced into the FEM code for analysis of thermo-hydro-mechanical coupling in porous media developed by the first author. Aiming at a hypothetical model for nuclear waste disposal in an unsaturated quartz aggregate rock mass with a laboratory scale, two computational conditions are designed: (1) the porosity and the permeability of rock mass are functions of the pressure solution; (2) the porosity and the permeability are constants, then the corresponding numerical simulations for a disposal period of 4 years are carried out; and the states of temperatures, solute concentrations in the intergranular fluid film and at the pore space, removal and precipitation masses, porosities and permeabilities, pore pressures, flow velocities and stresses in the rock mass are investigated. The results show:at the end of the calculation in case 1, pressure solution makes the porosities and the permeabilities decrease to about 43%-54%and 4.4%-9.1%of their initial values;under the action of the release heat of nuclear waste, the negative pore pressures in case 1 and case 2 are about 1.0-1.25 and 1.0-1.1 times of the initial values respectively; so the former represents an obvious effect of pressure solution;the magnitudes and distributions of stresses within the rock mass in the two calculation cases are much the same.
