CAJ | 학술논문

以锦屏某高边坡砂岩所赋存的高地应力环境为基础，开展峰前卸围压力学特性试验，研究了应力-应变全过程曲线、变形特征及参数劣化效应。试验结果表明，相对于加载试验，岩样卸荷破坏表现出明显的脆性特征，相同初始围压下卸荷破坏所需偏应力较加载试验少；卸荷过程横向应变和体积应变急剧增大，卸荷方向表现出明显的扩容特征；当初始围压小于某一值（30 MPa），岩样破坏所需卸荷量随初始围压增大而增大，当初始围压达到一定值（40 MPa 时），脆性特征更加明显，很少的卸荷量即可引起岩样破坏。以表征岩石卸荷程度的卸荷量 H 为参变量，分别对高、低围压下卸荷过程中变形参数（变形模量和泊松比）随卸荷量变化关系进行拟合，得到高、低地应力区卸荷过程中变形劣化参数的关系式。试验结果和计算方法对高应力区边坡开挖的稳定性评价具有一定指导意义。
이금병모고변파사암소부존적고지응력배경위기출，개전봉전사위압역학특성시험，연구료응력-응변전과정곡선、변형특정급삼수열화효응。시험결과표명，상대우가재시험，암양사하파배표현출명현적취성특정，상동초시위압하사하파배소수편응력교가재시험소；사하과정횡향응변화체적응변급극증대，사하방향표현출명현적확용특정；당초시위압소우모일치（30 MPa），암양파배소수사하량수초시위압증대이증대，당초시위압체도일정치（40 MPa 시），취성특정경가명현，흔소적사하량즉가인기암양파배。이표정암석사하정도적사하량 H 위삼변량，분별대고、저위압하사하과정중변형삼수（변형모량화박송비）수사하량변화관계진행의합，득도고、저지응력구사하과정중변형열화삼수적관계식。시험결과화계산방법대고응력구변파개알적은정성평개구유일정지도의의。
Based on the sandstone’s high geostress area from where a high slope in Jinping, a series of pre-peak unloading tests have been carried out; and the complete stress-strain curve, deformation characteristics and degradation effect of deformation parameters are studied. The test results show that compared to loading failure, the rock’s brittle characteristics of unloading failure is obvious;and unloading failure needs lower deviatoric stress under the same initial confining pressure. The lateral strain and volumetric strain increase sharply in the process of unloading; and the expansion characteristics in the unloading direction is obvious. When the initial confining pressure is less than a value(30 MPa), the rock’s failure unloading percentage would increase along with initial confining pressure’s enlargement. But when initial confining pressure grow up to a value(40 MPa), the brittle characteristics is very obvious;and a few unloading percentage can cause the rock failure. Taking unloading percentage H which expresses unloading level as variable quantity, and making fitting of deformation parameters when in high and low stress. We get the functions between deformation degradation parameters and unloading percentage under unloading process. The test results and calculation method could benefit excavation for the stability analysis of slope under high geostress.