CAJ | 학술논문

采用理想弹塑性模型对软土中地下工程开挖造成的变形问题进行分析会导致结果不准确。基于土的修正硬化模型，考虑小应变对其复杂变形特性的影响，以一工程实例为依托，对软土中深基坑开挖引起的连续墙变形和地表沉降进行数值模拟，结果表明：在连续墙变形预测上，理想弹塑性模型(Mohr-Coulomb(MC)模型)预测结果明显偏大，基坑底部以下尤为明显，硬化模型预测规律与监测值一致，但结果偏大；在地表沉降预测上，与修正硬化模型相比，MC 模型沉降槽要更宽更深，硬化模型结果偏大。总体来看，修正硬化模型可考虑不同加卸载状态引起的土的刚度变化和低应变性态的影响，在变形数值及其规律预测上，都要优于MC模型和硬化模型。
채용이상탄소성모형대연토중지하공정개알조성적변형문제진행분석회도치결과불준학。기우토적수정경화모형，고필소응변대기복잡변형특성적영향，이일공정실례위의탁，대연토중심기갱개알인기적련속장변형화지표침강진행수치모의，결과표명：재련속장변형예측상，이상탄소성모형(Mohr-Coulomb(MC)모형)예측결과명현편대，기갱저부이하우위명현，경화모형예측규률여감측치일치，단결과편대；재지표침강예측상，여수정경화모형상비，MC 모형침강조요경관경심，경화모형결과편대。총체래간，수정경화모형가고필불동가사재상태인기적토적강도변화화저응변성태적영향，재변형수치급기규률예측상，도요우우MC모형화경화모형。
Ideal elastoplastic model used in deformation analysis induced by underground engineering excavation leads to inaccurate prediction. Based on modified hardening soil model,considering the effect of small strain condition on soil behavior,a case study of deep excavation on the deformation of diaphragm wall and settlement of ground surface is numerical analyzed. The results show:according to the movement of diaphragm wall,the prediction result by using ideal elastoplastic mode-Mohr-Coulomb(MC) model is larger than observed deformation,and especially the part below the base of excavation. The result obtained from hardening soil model is consistent with but a little larger than the observed deformation. For the prediction of surface settlement,the trough obtained from MC model is deeper and wider than that obtained from modified hardening soil model,and the settlement from hardening soil model is larger. In general,because modified hardening model can be used to simulate the variation of soil behavior such as modulus and small strain during different loading and unloading states,modified hardening model is superior to MC model and hardening soil model whether in value and regular of deformation prediction.