CAJ | 학술논문

地质力学模型试验是研究拱坝整体稳定性的有效方法，采用250∶1的模型比例尺对有基础处理的大岗山拱坝进行三维地质力学模型试验。通过小块体砌筑技术模拟裂隙岩体的变形和强度、坝基不连续结构面以及坝基处理措施；通过油压千斤顶加载系统施加坝面水荷载；采用的数据采集系统能及时、高效地测量坝面应变、坝基岩体外部位移和内部相对位移，并自动存储数据。采用超载水容重法进行超载破坏试验，得到拱坝坝体位移和应力的分布规律以及坝体和坝基岩体的开裂破坏过程。采用3个特征超载安全系数K1，K2和K3对大岗山拱坝整体稳定性进行评价。通过地质力学模型试验和基于变形加固理论的三维数值模拟对比分析表明，大岗山拱坝整体稳定性较高，并得到对拱坝-坝基整体稳定起控制性作用的部位。
지질역학모형시험시연구공패정체은정성적유효방법，채용250∶1적모형비례척대유기출처리적대강산공패진행삼유지질역학모형시험。통과소괴체체축기술모의렬극암체적변형화강도、패기불련속결구면이급패기처리조시；통과유압천근정가재계통시가패면수하재；채용적수거채집계통능급시、고효지측량패면응변、패기암체외부위이화내부상대위이，병자동존저수거。채용초재수용중법진행초재파배시험，득도공패패체위이화응력적분포규률이급패체화패기암체적개렬파배과정。채용3개특정초재안전계수K1，K2화K3대대강산공패정체은정성진행평개。통과지질역학모형시험화기우변형가고이론적삼유수치모의대비분석표명，대강산공패정체은정성교고，병득도대공패-패기정체은정기공제성작용적부위。
The geomechanical model test is an effective method to study the global stability of arch dams. The geomechanical model test on the arch dam with foundation reinforcement at Dagangshan in the similar scale of 250∶1 was conducted. The deformation and strength of jointed rock mass,the discontinuous structural surfaces and the reinforcement measures were simulated through the masonry technique of small blocks. The water load imposed on the dam surface was controlled by the hydraulic jacks. The strains and displacements were collected and saved automatically and effectively with a data acquisition system of high accuracy. The high water pressure method was employed for the overload failure test. The stress and displacement distributions of the scaled dam were obtained and the failure processes of the scaled dam and the abutment were explored. Three factors of the global overload safety K1,K2 and K3,were used to evaluate the global stability of dams. The comparative analysis between the geomechanical model test and the numerical simulation based on the deformation reinforcement theory indicated that the global stability of the arch dam at Dagangshan was relatively high. The weak areas controlling the global stability of the arch dam was located.