CAJ | 학술논문

通过对各种D－P准则进行系统深入的分析，提出了一种在非均质边坡中实现D－P系列屈服准则间相互转换的方法，针对一个具体的非均质边坡建立弹塑性有限元分析模型，采用强度折减法计算得出各D－P准则下的安全系数，与极限平衡法计算结果进行对比分析，验证了该方法的可行性。在此基础上对强度折减法中各种失稳判据在非均质边坡中的适用性和不同网格尺寸对非均质边坡安全系数计算精度的影响进行研究。结果表明：以塑性区贯通和特征部位位移突变作为失稳判据，通过对比不同强度折减系数下的位移场和塑性区特性，可以减弱非确定因素带来的影响，其计算出的安全系数与极限平衡法所得结果较为接近，而采用数值计算不收敛作为失稳判据所得结果误差较大，不满足工程精度要求。因此，采用强度折减法对非均质土坡进行稳定性分析时，建议使用特征部位位移突变结合塑性区贯通作为失稳判据。
통과대각충D－P준칙진행계통심입적분석，제출료일충재비균질변파중실현D－P계렬굴복준칙간상호전환적방법，침대일개구체적비균질변파건립탄소성유한원분석모형，채용강도절감법계산득출각D－P준칙하적안전계수，여겁한평형법계산결과진행대비분석，험증료해방법적가행성。재차기출상대강도절감법중각충실은판거재비균질변파중적괄용성화불동망격척촌대비균질변파안전계수계산정도적영향진행연구。결과표명：이소성구관통화특정부위위이돌변작위실은판거，통과대비불동강도절감계수하적위이장화소성구특성，가이감약비학정인소대래적영향，기계산출적안전계수여겁한평형법소득결과교위접근，이채용수치계산불수렴작위실은판거소득결과오차교대，불만족공정정도요구。인차，채용강도절감법대비균질토파진행은정성분석시，건의사용특정부위위이돌변결합소성구관통작위실은판거。
Through focusing on analyzing systematically and deeply on Drucker-Prager yield criterion,the conversion method of different Drucker-Prager criterion in inhomogeneous slope was put forward. An elastic-plastic FEM for specific inhomogeneous slope was established and the safety factor was calculated by using SSR technique based on the Drucker-Prager yield criterion. Comparing with the solution of traditional limit equilibri-um method,the proposed method was proved to be feasible in inhomogeneous slope. On this basis,the applicability of different instability criterions in inhomogeneous slope and the effect of mesh size on calculating precision of safety factor were studied. The results show that the effect of uncertain conditions for safety factor can be weakened by contrast to displacement field and characteristics of plastic zone under different strength reduction co-efficients and the computing result and potential slip surface obtained based on displacement mutation at certain characteristic position is fairly close to the solution gained by traditional limit equilibrium method,while the results based on the convergence of numerical computations giving large de-viation are not fit for engineering precision. It is suggested that the instability criterion which using displacement mutation at certain characteristic position combing with plastic zone juncture should be more reasonable and applicable than the convergence of numerical computations when inhomo-geneous slope is analyzed.