CAJ | 학술논문

本文依托K3+085.0分蓄洪区总排渠中桥桥背发泡轻质土回填工程,介绍了发泡轻质土的现场施工应用。结合发泡轻质土具体填筑工程,建立有限元沉降计算模型,研究发泡轻质土密度与抗压强度参数对沉降的影响,结果表明：降低发泡轻质土的密度能明显改善桥背路面沉降状况,轻质土抗压强度的设计则更需要考虑回填结构与路面之间的局部作用。文中模拟计算了实验室制备的5种发泡轻质土材料回填时桥头搭板末端的总沉降,计算结果表明,综合考虑工程安全与经济性因素,设计发泡轻质土密度为700 kg/m3,抗压强度为1.5 Mpa较为合适,且采用C型发泡轻质土填筑时,台后路面沉降能满足桥头跳车病害防治指标。最后将C型发泡轻质土应用于工程实践,根据工后沉降观测结果,台后路面在工后3个月内没有明显沉降发生,达到了项目预期要求。
본문의탁K3+085.0분축홍구총배거중교교배발포경질토회전공정,개소료발포경질토적현장시공응용。결합발포경질토구체전축공정,건립유한원침강계산모형,연구발포경질토밀도여항압강도삼수대침강적영향,결과표명：강저발포경질토적밀도능명현개선교배로면침강상황,경질토항압강도적설계칙경수요고필회전결구여로면지간적국부작용。문중모의계산료실험실제비적5충발포경질토재료회전시교두탑판말단적총침강,계산결과표명,종합고필공정안전여경제성인소,설계발포경질토밀도위700 kg/m3,항압강도위1.5 Mpa교위합괄,차채용C형발포경질토전축시,태후로면침강능만족교두도차병해방치지표。최후장C형발포경질토응용우공정실천,근거공후침강관측결과,태후로면재공후3개월내몰유명현침강발생,체도료항목예기요구。
Relying on the K3 +085 . 0 Chief flood diversion canal bridge backfilling project , this paper has introduced the construction application. According to specific construction, this paper established settlement calculation finite element model to study the influence done by changing the parameters of foamed cement banking ( FCB) like density and compressive strength on settlement of pavement,the result shows reducing the density of FCB can significantly improve the settlement status at the back of bridge abutment and the design of its compressive strength should consider the local interaction between backfill and pavement structure. Five kinds of FCB with different density and compressive strength were prepared in the laboratory. Through comparative analysis of simulation results of backfilling with those five kinds of FCB,choose the optimal material parameters design with considering both engineering safety and economy factors, that is the density of 700 kg/m3 and the compressive strength of 1. 5 Mpa. The simulation result shows the settlement at the back of bridge abutment is less than the settlement control index when the C type of FCB is backfilled at the back of bridge abutment according to the structure design. Finally, the designed backfill structure and material were put into practice, the observation shows the obvious post-construction settlement didn 't occur after 3 months,which achieved the requirements of the project.