CAJ | 학술논문

以北京某地铁盾构区间下穿京沪高铁工程为背景，采用ANSYS建立三维地层结构模型，分别对盾构施工时不采取防护方案和采取防护方案两种情况进行沉降变形分析。并在下穿前进行4个试验段掘进，通过分析掘进参数和地面沉降，确定盾构下穿施工参数。最后在下穿施工过程中对桥梁墩台沉降和隔离桩水平变形规律进行监测分析。综合得出：①采用隔离桩防护方案，盾构下穿施工引起的变形量＜1mm，满足设计要求；②通过试验确定上土仓压力、出土量、浆液配合比、注浆量及注浆压力等施工参数能够有效控制地表沉降；③在盾构施工阶段，桥梁墩台最大沉降值为0．8mm，施工结束后变形均趋于稳定；盾构施工时隔离桩朝隧道方向变形，在隧道埋深处变形较大，最大水平位移为3．15mm。
이북경모지철순구구간하천경호고철공정위배경，채용ANSYS건립삼유지층결구모형，분별대순구시공시불채취방호방안화채취방호방안량충정황진행침강변형분석。병재하천전진행4개시험단굴진，통과분석굴진삼수화지면침강，학정순구하천시공삼수。최후재하천시공과정중대교량돈태침강화격리장수평변형규률진행감측분석。종합득출：①채용격리장방호방안，순구하천시공인기적변형량＜1mm，만족설계요구；②통과시험학정상토창압력、출토량、장액배합비、주장량급주장압력등시공삼수능구유효공제지표침강；③재순구시공계단，교량돈태최대침강치위0．8mm，시공결속후변형균추우은정；순구시공시격리장조수도방향변형，재수도매심처변형교대，최대수평위이위3．15mm。
Based on a shield tunnel of Beijing subway under?passing the viaduct of Beijing?Shanghai high?speed railway, the deformations induced by shield construction were analyzed in following two cases respectively:there was not any protection measures being taken and the isolation pile protection scheme was adopted. Four test sections were performed before the under?passing, and the construction parameters in shield tunnel crossing process were recommended by analyzing boring parameters and ground subsidence of test sections. The characteristics of settlements of bridge pier and horizontal deformation of isolation pile were monitored and analyzed in the crossing process of shield construction. Results show that: ① the maximum deformation caused by shield under?passing construction in the isolation pile protection scheme is less than 1 mm which is meeting the design requirements; ② it can be determined through the test sections that ground settlement is controlled effectively by construction parameters such as upper earth pressure, excavated volume, grouting formula, grouting amount and grouting pressure and so on;③ in the shield construction stage, the maximum subsidence value of bridge pier is 0. 8mm and the deformations tend to be stable after the construction;the deformations of isolation pile are in the direction of the tunnel, and the maximum horizontal displacement buried in the depth of the tunnel is 3. 15mm.