CAJ | 학술논문

为了寻求基于强度折减法的三维边坡稳定分析的合理判据，依托珍珠坝边坡采用FALC3D对位移突变判据及塑性区贯通判据进行分析，并与ANSYS计算结果和二维极限平衡结果进行比较。结果表明：在采用强度折减法对三维边坡稳定分析时，位移突变判据根据总位移增量和折减系数关系曲线较易识别突变点且特征点选在边坡坡顶滑体上较为合理；针对塑性区贯通判据的不足，提出了以贯通率增量和折减系数曲线上的突变点来判别边坡稳定性。因此，三维边坡失稳判据的合理选用应遵循以下原则：建议在滑带明确的情况下采用塑性区贯通率增量突变判据，在滑带未知的情况下采用位移增量突变判据。
위료심구기우강도절감법적삼유변파은정분석적합리판거，의탁진주패변파채용FALC3D대위이돌변판거급소성구관통판거진행분석，병여ANSYS계산결과화이유겁한평형결과진행비교。결과표명：재채용강도절감법대삼유변파은정분석시，위이돌변판거근거총위이증량화절감계수관계곡선교역식별돌변점차특정점선재변파파정활체상교위합리；침대소성구관통판거적불족，제출료이관통솔증량화절감계수곡선상적돌변점래판별변파은정성。인차，삼유변파실은판거적합리선용응준순이하원칙：건의재활대명학적정황하채용소성구관통솔증량돌변판거，재활대미지적정황하채용위이증량돌변판거。
For the purpose of trying to find a reasonable criterion for stability analysis of three-dimensional slope based on strength reduction method, the displacement mutation criterion and the connectivity criterion of plastic zone are analyzed based on Zhenzhuba slope by FLAC3D;and then the results are compared with the ANSYS and two-dimensional limit equilibrium’s ones. It is shown that, in the stability analysis of three-dimensional slope using strength reduction, mutations are easily identified in the curve between the increments of total displacement and reduction factors and reasonable feature points should be selected on the top of the slope for the displacement mutation criterion. Meanwhile, a modified criterion is put forward due to the shortcomings of the connectivity of plastic zone criterion. It is that the mutations, which are on the curve between the increments of penetration rate of the plastic zone and reduction factors, are used to judge the instability state of three-dimensional slope. So the reasonable choice of three-dimensional slope’s instability criterion should be as follows. If the slip band is known clearly, the increments of penetration rate of the plastic zone criterion is suggested;if not, the displacement increment mutation criterion is suggested.