CAJ | 학술논문

甘肃省引洮供水一期工程总干渠7#引水隧洞出口,采用冻结施工法成功穿越了含水疏松砂岩地层.应用大型有限元软件 ANSYS,对冻结施工过程进行了三维数值模拟,分析了隧洞开挖过程中冻土帷幕的位移和应力分布情况,并提出了在施工过程中的一些安全保障措施,以便准确地掌握冻土温度的变化及冻土帷幕厚度发展状况,从而确定最优的开挖时间.分析结果及工程实践表明：最大拉、压、剪应力计算值分别为3.02、0.15和0.97 Mpa,计算值相对于设计值的安全系数分别为13、1.9 和 1.5,并确定了其极值发生位置.同时也表明利用冻结施工法穿越含水疏松砂岩地层隧洞是合理的,研究结果可为引洮供水一期工程总干渠7#引水隧洞出口冻结施工提供理论支持,同时也为类似工程提供参考.
감숙성인조공수일기공정총간거7#인수수동출구,채용동결시공법성공천월료함수소송사암지층.응용대형유한원연건 ANSYS,대동결시공과정진행료삼유수치모의,분석료수동개알과정중동토유막적위이화응력분포정황,병제출료재시공과정중적일사안전보장조시,이편준학지장악동토온도적변화급동토유막후도발전상황,종이학정최우적개알시간.분석결과급공정실천표명：최대랍、압、전응력계산치분별위3.02、0.15화0.97 Mpa,계산치상대우설계치적안전계수분별위13、1.9 화 1.5,병학정료기겁치발생위치.동시야표명이용동결시공법천월함수소송사암지층수동시합리적,연구결과가위인조공수일기공정총간거7#인수수동출구동결시공제공이론지지,동시야위유사공정제공삼고.
By using artificially ground freezing process,No.7 tunnel export of Gansu YinTao Proj ect Phase-I successfully pass through water bearing loose sandstones formations.On the basis of three-dimen-sional numerical simulation for work progress through the application of the large finite element analysis software ANSYS,this paper analyzed the displacement and stress distributions of frozen soil curtain in the process of tunnel excavation,and put forward in the construction process of some security measures,in or-der to accurately grasp the changes and development of frozen soil thickness of soil temperature,as well as determine the optimal excavation.The analysis results and engineering practice showed that the maximum tension,compression,shear stress calculation values were 3.02,0.15 and 0.97 Mpa,the safety coefficient was 13,1.9 and 1.5 respectively,and its extremum position was determined.It also showed that using freezing method through the water tunnel was reasonable in loose sandstone reservoir.In this paper,some effective measures and reasonable advice were put forward for freezing construction by integrating on-site data monitoring,which provided theoretical support for the freezing construction of No.7 tunnel export of Gansu YinTao Proj ect Phase-I,and set up a reference for similar proj ects meanwhile.