CAJ | 학술논문

采用"20 MN高温高压岩体三轴试验机",精心设计4块完整花岗岩岩样.在25和75 MPa静水应力条件下,实时测试花岗岩岩样在热破裂作用下的渗流规律,这是国内目前首次对花岗岩在高温三维应力作用下渗流规律的实时试验研究.试验结果表明:(1) 在三维应力条件下,花岗岩发生热破裂.在热破裂升温过程中,花岗岩岩样的渗透率随温度的升高而表现为正指数增大的规律.(2) 在热破裂作用初期,花岗岩岩样渗透率随温度的增加而缓慢增加.在热破裂作用的后期,花岗岩岩样渗透率随温度的升高而急剧升高直至达到渗透率峰值.(3) 在整个热破裂升温过程中,各花岗岩岩样渗透率随温度升高而不断增加,渗透率变化率随温度的升高而不断加速.(4) 在静水应力和热破裂作用下,花岗岩岩样的渗透率峰值和初始值的比值最高可达93倍,其渗透率的变化率最高达3.5×10~(-4) mD/℃,热破裂作用极大地增强花岗岩的渗透特性.试验得到的数据和结论对高温岩体地热开发、石油二次开采及煤炭地下气化具有重要的意义.
채용"20 MN고온고압암체삼축시험궤",정심설계4괴완정화강암암양.재25화75 MPa정수응력조건하,실시측시화강암암양재열파렬작용하적삼류규률,저시국내목전수차대화강암재고온삼유응력작용하삼류규률적실시시험연구.시험결과표명:(1) 재삼유응력조건하,화강암발생열파렬.재열파렬승온과정중,화강암암양적삼투솔수온도적승고이표현위정지수증대적규률.(2) 재열파렬작용초기,화강암암양삼투솔수온도적증가이완만증가.재열파렬작용적후기,화강암암양삼투솔수온도적승고이급극승고직지체도삼투솔봉치.(3) 재정개열파렬승온과정중,각화강암암양삼투솔수온도승고이불단증가,삼투솔변화솔수온도적승고이불단가속.(4) 재정수응력화열파렬작용하,화강암암양적삼투솔봉치화초시치적비치최고가체93배,기삼투솔적변화솔최고체3.5×10~(-4) mD/℃,열파렬작용겁대지증강화강암적삼투특성.시험득도적수거화결론대고온암체지열개발、석유이차개채급매탄지하기화구유중요적의의.
By using 20 MN servo-controlled triaxial rock testing machine with high temperature and high pressure,the real-time seepage laws of 4 pieces of intact granite samples under hydrostatic pressures of 25 and 75 Mpa with thermal cracking action(TCA) are researched. It is the first real-time experimental study on seepage law of granite under high temperature with three-dimensional stress. This research results are listed as follows:(1) Under three-dimensional stress,there is thermal cracking phenomenon for all granite samples. Through the seepage law of intact granite rock sample,it is found that permeability shows of exponential growth function of temperature through the process of thermal cracking. (2) The permeability of granite sample has a slow growth through initial stage of thermal cracking action,a rapid growth through late stage of TCA and up to peak value of permeability in the final with increase of temperature. (3) The permeability and its rate of granite sample have a continuous growth through whole stage of TCA with increasing temperature. (4) The ratio of peak value of permeability to its initial value is up to 93 and permeability rate is up to 3.5×10~(-4) mD/℃. TCA has an important role in enhancing permeability of granite. Experimental data and conclusion have an important significance for construction of exploitation of hot dry rock,secondary oil exploitation and underground coal gasification.