CAJ | 학술논문

为解决经典强度准则预测岩石破坏强度不准确的问题，本文使用交叉最小二乘支持向量机（DILSSVM）在单轴及三轴加载情况下对岩石强度进行预测。将现场和实验室试验得到的各种岩石相关数据划分成训练和验证子集。将抗压强度σc和最小主应力σ3作为输入值，最大主应力值σ1 f作为输出值训练DILSSVM。使用训练后的DILSSVM预测岩石破坏时的σ1 f，同时使用训练子集反演Hoek－Brown经验公式的常数m。使用测试数据对训练后DILSSVM预测的目标岩石强度的准确性进行验证，同时将测试数据带入2类Hoek－Brown（m值的取值不同）经验公式预测目标岩石强度σ1 f。比较DILSSVM和Hoek－Brown预测结果，表明：DILSSVM预测结果的均方差减小了45％～55％，决定系数增加了0.055～0.085，更接近于1。说明DILSSVM对岩石强度的预测范围较宽，且适合岩石种类多变的复杂非线性情况。
위해결경전강도준칙예측암석파배강도불준학적문제，본문사용교차최소이승지지향량궤（DILSSVM）재단축급삼축가재정황하대암석강도진행예측。장현장화실험실시험득도적각충암석상관수거화분성훈련화험증자집。장항압강도σc화최소주응력σ3작위수입치，최대주응력치σ1 f작위수출치훈련DILSSVM。사용훈련후적DILSSVM예측암석파배시적σ1 f，동시사용훈련자집반연Hoek－Brown경험공식적상수m。사용측시수거대훈련후DILSSVM예측적목표암석강도적준학성진행험증，동시장측시수거대입2류Hoek－Brown（m치적취치불동）경험공식예측목표암석강도σ1 f。비교DILSSVM화Hoek－Brown예측결과，표명：DILSSVM예측결과적균방차감소료45％～55％，결정계수증가료0.055～0.085，경접근우1。설명DILSSVM대암석강도적예측범위교관，차괄합암석충류다변적복잡비선성정황。
The classical failure criteria for prediction of rock strength can not be accurate.This study uses the diagonal intersection least squares SVM(DILSSVM)as new method for prediction of the rock strength in a wide loading such as uniaxial and triaxial loading.For each rock type,data obtained from field experiments and laboratory experiments are divided into training and test sets.DILSSVM is employed to train with the compressive stress (σc)and minor principal stress (σ3)and to predict the value of major principal stress (σ1f)at failure.The training sets are used in regression analysis for m in Hoek-Brown (H-B)equation.Then,the test sets are used to examine the accuracy of target rock strength with DILSSVM after training and these of the two H-B model (with different m).Comparison of the results of the DILSSVM with the two H-B models shows that the DILSSVM always has less root mean squared error(decreased 45%~55%)and higher coefficient of determination(enhanced 0.055~0.085,near to 1 ).The DILSSVM shows better flexibility in σ1f at failure in each rock type and a wide loading range.