CAJ | 학술논문

土石坝张拉裂缝一般由坝体的不均匀沉降变形引起,是土石坝破坏的主要诱因和表现形式之一.将基于现场沉降监测资料的传统变形倾度法进行了扩展,通过在有限元计算程序中嵌入变形倾度计算模块,发展了基于有限元变形计算的变形倾度有限元法.该方法简洁实用,方便与常规有限元变形计算相耦合,可作为在工程设计阶段分析和估算土石坝是否会发生表面张拉裂缝的实用方法.应用所发展的变形倾度有限元法,以糯扎渡高心墙堆石坝工程为例,进行了坝体后期变形引起坝体表面发生张拉裂缝的敏感性计算分析,探讨了高土石坝变形倾度的分布规律以及与坝体后期变形的关系,发现对糯扎渡高心墙堆石坝,坝顶后期沉降最大值小于坝高0.39%,可作为防止发生坝顶横向张拉裂缝的控制工况.通过工程实例的计算,说明提出的方法可用于高土石坝的裂缝预测分析.
토석패장랍렬봉일반유패체적불균균침강변형인기,시토석패파배적주요유인화표현형식지일.장기우현장침강감측자료적전통변형경도법진행료확전,통과재유한원계산정서중감입변형경도계산모괴,발전료기우유한원변형계산적변형경도유한원법.해방법간길실용,방편여상규유한원변형계산상우합,가작위재공정설계계단분석화고산토석패시부회발생표면장랍렬봉적실용방법.응용소발전적변형경도유한원법,이나찰도고심장퇴석패공정위례,진행료패체후기변형인기패체표면발생장랍렬봉적민감성계산분석,탐토료고토석패변형경도적분포규률이급여패체후기변형적관계,발현대나찰도고심장퇴석패,패정후기침강최대치소우패고0.39%,가작위방지발생패정횡향장랍렬봉적공제공황.통과공정실례적계산,설명제출적방법가용우고토석패적렬봉예측분석.
@@@@Tensile crack induced by differential settlement is the primary cause and typical form in earth-rock dam failure. The classical deformation gradient method is extended by coupling with finite element method. The newly developed deformation gradient finite element method is used to calculate deformation gradient with deformation obtained by conventional FEM instead of on-site monitoring data. This method is simple, and can be used to estimate the risk of tensile cracking in the design phase of dam construction. The possibility of tensile cracking caused by post deformation in Nuozhadu high earth core rockfill dam is analyzed with the method proposed. The distribution rules of deformation gradient and its relation with post deformation are discussed. The analytical results show that:in Nuozhadu high earth core rockfill dam, the post settlement at dam crest is smaller than 0.39 percent of the dam height; so that tensile cracking is almost impossible. According to the case study, the proposed method is applicable to cracking analysis of high earth-rock dam.