CAJ | 학술논문

盐岩矿床中难溶泥质夹层的存在给地下储库水溶造腔带来诸多不利影响,如何有效地预测与控制水溶造腔过程中泥质夹层的垮塌成为一个亟待解决的技术难题.以该问题为背景,研究不同浓度卤水浸泡对各类含盐率泥质夹层试样抗拉强度弱化的影响规律.试验结果表明:浸泡卤水的浓度越低、浸泡时间越长对夹层抗拉强度弱化的影响越明显;夹层中盐岩的溶解与黏土矿物的吸水膨胀及软化对试样抗拉强度的弱化有相互促进的作用.试验结果还表明,不同含盐率试样抗拉强度弱化的规律各不相同:在与造腔现场卤水浓度相近的卤水浸泡下,低含盐率泥质夹层抗拉强度弱化的程度较轻、速度较慢;中含盐率夹层试样由浸泡引起的弱化现象较为明显,盐岩颗粒的溶解及黏土矿物的吸水膨胀对夹层的弱化起控制作用;高含盐率泥质夹层试样在非饱和卤水浸泡下快速弱化破坏,其主要原因是盐岩颗粒的溶解引起的架构破坏.
염암광상중난용니질협층적존재급지하저고수용조강대래제다불리영향,여하유효지예측여공제수용조강과정중니질협층적과탑성위일개극대해결적기술난제.이해문제위배경,연구불동농도서수침포대각류함염솔니질협층시양항랍강도약화적영향규률.시험결과표명:침포서수적농도월저、침포시간월장대협층항랍강도약화적영향월명현;협층중염암적용해여점토광물적흡수팽창급연화대시양항랍강도적약화유상호촉진적작용.시험결과환표명,불동함염솔시양항랍강도약화적규률각불상동:재여조강현장서수농도상근적서수침포하,저함염솔니질협층항랍강도약화적정도교경、속도교만;중함염솔협층시양유침포인기적약화현상교위명현,염암과립적용해급점토광물적흡수팽창대협층적약화기공제작용;고함염솔니질협층시양재비포화서수침포하쾌속약화파배,기주요원인시염암과립적용해인기적가구파배.
The existence of indissolvable muddy intercalation leads to many adverse effects for building salt cavern storages by solution mining. It is an urgent technical problem that how to forecast and control the collapse of indissolvable intercalation. Taking the problem as research background,the laws of tensile strength weakening of intercalation samples soaked in different brine concentrations are studied. The test results show that the lower of brine concentration is or the longer of soaked time is,the more obvious the weakening degree will be;the two factors,namely solution of salt and water-uptake soften of clay mineral,promote each other during weakening process. The test results also show that the weakening laws are not the same among samples with different salt content rates. Soaked in brine whose concentration is close to field brine concentration,the tensile strength of muddy intercalation samples with low salt content rate are weakened lightly and slowly;the samples with middle salt content rates are weakened obviously when soaked in middle concentration brine,and the solution of salt grains and water-uptake of clay mineral play a controlling role in weakening of intercalation;soaked in unsaturated brine,the samples with high salt content rate are weakened quickly,and the primary reason is the damage of framework caused by solution of salt grains.