CAJ | 학술논문

为揭示盐岩水溶造腔过程中难溶夹层力学特性与卤水浸泡时间的关系，更好地了解夹层的软化规律和范围，为预测和控制夹层的破坏垮塌提供理论支持，以云应盐矿中的泥质硬石膏夹层为研究对象，进行不同浸泡时间下的单轴压缩和巴西劈裂软化试验研究，发现其力学强度随卤水浸泡时间劣化明显，其中，单轴抗压强度、弹性模量、泊松比与卤水浸泡时间呈显著的DoseResp函数关系，抗拉强度与浸泡时间呈显著的Slogistic1函数关系，且试件的单轴压缩及巴西劈裂试验的破坏形式随浸泡时间的增加有从张拉破坏向剪切破坏的渐变趋势。通过分析试验结果发现，卤水对夹层力学强度的软化作用与夹层可溶物含量、夹层成分遇水膨胀的不均性、卤水的润滑作用和矿物晶键的软化作用均存在密切相关。推导了基于浸泡时间的夹层损伤演化方程，建立夹层轴向和径向的软化深度模型，并将其应用于水溶造腔过程中难溶夹层软化范围的划定。此外，基于夹层抗拉强度与卤水浸泡时间的关系，给出判定和预测夹层局部软化破坏的最大拉应力强度准则。
위게시염암수용조강과정중난용협층역학특성여서수침포시간적관계，경호지료해협층적연화규률화범위，위예측화공제협층적파배과탑제공이론지지，이운응염광중적니질경석고협층위연구대상，진행불동침포시간하적단축압축화파서벽렬연화시험연구，발현기역학강도수서수침포시간열화명현，기중，단축항압강도、탄성모량、박송비여서수침포시간정현저적DoseResp함수관계，항랍강도여침포시간정현저적Slogistic1함수관계，차시건적단축압축급파서벽렬시험적파배형식수침포시간적증가유종장랍파배향전절파배적점변추세。통과분석시험결과발현，서수대협층역학강도적연화작용여협층가용물함량、협층성분우수팽창적불균성、서수적윤활작용화광물정건적연화작용균존재밀절상관。추도료기우침포시간적협층손상연화방정，건립협층축향화경향적연화심도모형，병장기응용우수용조강과정중난용협층연화범위적화정。차외，기우협층항랍강도여서수침포시간적관계，급출판정화예측협층국부연화파배적최대랍응력강도준칙。
The uniaxial compression and Brazilian splitting tests on the argillaceous anhydrite from the interlayers of the mine at Yunying were conducted with the different time lengths of immersion in order to reveal the mechanical characteristics (such as the softening) of the insoluble interlayer upon brine immersion and to provide the theoretical guide for the prediction and control of the interlayer destruction during the process of the cavity building inside the rock salt. It was found that the mechanical strengths of interlayer deteriorated significantly with the increasing of the time length of brine immersion. The relationships of the uniaxial compressive strength,the elastic modulus and Poisson′s ratio with the time lengths of brine immersion were fit well with DoseResp function. While the relationship between the tensile strength and the time length of brine immersion was fit with Slogistic1 function. The failure modes of the specimens in the uniaxial compression and Brazilian split tests were gradually changed from the tension failure to the shear failure as the time length of immersion was increased. It was found from the results of the test that the softening effect of brine was closely related with the soluble content of interlayer,the heterogeneity of hydraulic swelling of the interlayer ingredients,the lubrication of brine and the softening effect on the crystal bonding of minerals. An equation of the damage evolution with the time of immersion for interlayers was derived according to the experimental data and a model for softened depth of interlayer in the axial and radial directions was established. The model was applied to determine the softened range of the insoluble interlayer during the process of cavity building in rock salt. In addition,a criterion of maximum tensile stress was presented for the determination and prediction of the local softening damage of interlayers based on the relationship between the tensile strengths and the time lengths of brine immersion.