CAJ | 학술논문

坑道施工中，超挖回填材料性能对衬砌的受力分布有较大影响。基于FLAC 3 D有限差分数值计算软件，模拟坑道开挖施工，通过改变回填层的弹性模量和厚度，分析了不同回填介质对衬砌结构弯矩和位移的影响，并比较了不同围岩级别对衬砌结构的弯矩影响。计算结果表明：1）拱顶、侧墙和底板的最大弯矩随弹性模量的增大而减小，弯矩开始降幅较大，但最终趋于平缓；拱顶、侧墙和底板的最大弯矩随回填层厚度的增大而增大，几乎成线性增加。2）拱顶和底板的最大位移随弹性模量的增大而增大，侧墙反之；拱顶和侧墙的最大位移随回填层厚度的增大而增大，底板则基本保持不变。
갱도시공중，초알회전재료성능대츤체적수력분포유교대영향。기우FLAC 3 D유한차분수치계산연건，모의갱도개알시공，통과개변회전층적탄성모량화후도，분석료불동회전개질대츤체결구만구화위이적영향，병비교료불동위암급별대츤체결구적만구영향。계산결과표명：1）공정、측장화저판적최대만구수탄성모량적증대이감소，만구개시강폭교대，단최종추우평완；공정、측장화저판적최대만구수회전층후도적증대이증대，궤호성선성증가。2）공정화저판적최대위이수탄성모량적증대이증대，측장반지；공정화측장적최대위이수회전층후도적증대이증대，저판칙기본보지불변。
In tunnel construction,overbreak backfill material has great influence on the distribution of the internal force of the tunnel lining.In the paper,the tunnel excavation is simulated on basis of FLAC 3 D finite difference numerical software and the influence of different backfill materials on the bending moment and displacement of the lining structure is analyzed by changing the elastic modulus and the backfill layer thickness.The impact of different surrounding rock grades on the bending moment of the lining structure is also compared.The results show that the maximum bending mo-ment of the crown,sidewall and floor slab decreases as the elastic modulus increases,and it decreases dramatically at first and starts faster and smaller,and tends to decrease gently in the end;the maximum bending moment of the crown, sidewall and floor slab increases almost in linear as the thickness of the backfill layer increases;The maximum displace-ment of the crown and floor slab increases as the elastic modulus increases,however,the maximum displacement of the sidewall is just on the contrary;The maximum displacement of the crown and sidewall increases as the thickness of the backfill layer increases,however,the maximum displacement of the floor slab remains almost stable.