CAJ | 학술논문

基于极限分析的上限定理,提出一种土石坝极限抗震分析的新方法.该方法假定土体为理想刚塑性材料且满足相关联流动准则,将土石坝坡滑动体划分为若干水平土条,计算各滑动土条的外功率与内能耗散,然后通过能量平衡条件,利用优化算法确定土石坝的极限抗震能力.运用所提方法,对一典型心墙土石坝进行极限抗震能力分析,研究了水平条分数以及抗剪强度参数对极限抗震能力影响.计算结果表明,水平条分数对滑裂面形状影响较大而对大坝极限抗震能力影响较小.当水平条分数增加到一定数目时大坝极限抗震能力最终趋于一个稳定值.同时,堆石料的抗剪强度对大坝极限抗震能力影响较大.通过与传统的极限平衡法对比,验证了所提方法的正确性与可行性.
기우겁한분석적상한정리,제출일충토석패겁한항진분석적신방법.해방법가정토체위이상강소성재료차만족상관련류동준칙,장토석패파활동체화분위약간수평토조,계산각활동토조적외공솔여내능모산,연후통과능량평형조건,이용우화산법학정토석패적겁한항진능력.운용소제방법,대일전형심장토석패진행겁한항진능력분석,연구료수평조분수이급항전강도삼수대겁한항진능력영향.계산결과표명,수평조분수대활렬면형상영향교대이대대패겁한항진능력영향교소.당수평조분수증가도일정수목시대패겁한항진능력최종추우일개은정치.동시,퇴석료적항전강도대대패겁한항진능력영향교대.통과여전통적겁한평형법대비,험증료소제방법적정학성여가행성.
A new approach based on the limit analysis upper bound theorem is proposed to study the seismic stability of earth-rock dams. First, according to the upper bound analysis, a perfectly plastic soil model is assumed with an associated flow rule. Then, the dam slope is divided into horizontal slices with regarding the sliding surface as an arbitrary surface. In order to obtain the maximum anti-seismic capability of dams and the corresponding sliding surface, the multivariate function is established by the energy-work balance equation and optimized by intelligent algorithm. For the study of the influences of shear strength parameters and horizontal slice number on the maximum anti-seismic capability and the sliding surface, the new approach is applied to a typical earth-rock dam with core wall. It is shown by the results that the horizontal slice number has a great influence on the sliding surface but a small influence on the maximum anti-seismic capability. When the horizontal slices achieve a certain number, the maximum anti-seismic capability of dams is ultimately a stable value. Meanwhile, the shear strength parameters of the rockfill materials have a great influence on the maximum anti-seismic capability. Compared with the limit equilibrium method the result illustrates the correctness and feasibility of the proposed method.