CAJ | 학술논문

软土地层中盾构法隧道施工对周围环境影响的控制是施工中最为关心问题.依托上海迎宾三路f14.27 m 土压平衡盾构隧道工程,通过在试验段布设监测断面、调整施工参数,研究超大直径土压平衡盾构施工诱发的地表沉降分布和发展规律.通过分析发现,超大直径土压平衡盾构施工中土舱压力和同步注浆参数的设定决定了地表沉降的发展规律,其中同步注浆的参数设定对于控制地表沉降起关键作用.同步注浆填充效果不佳会导致盾尾上方较大范围内地表沉降发展明显,距离盾尾越近,沉降速率越大,而填充效果较好时,地表沉降可以得到有效控制,Peck 公式比较适于盾尾间隙填充效果不佳的情况.另外,监测数据揭示,盾构停推过程中超孔隙水压力逐渐消散,地表沉降持续发展,距离盾尾越近的位置地表沉降发展速率越大.
연토지층중순구법수도시공대주위배경영향적공제시시공중최위관심문제.의탁상해영빈삼로f14.27 m 토압평형순구수도공정,통과재시험단포설감측단면、조정시공삼수,연구초대직경토압평형순구시공유발적지표침강분포화발전규률.통과분석발현,초대직경토압평형순구시공중토창압력화동보주장삼수적설정결정료지표침강적발전규률,기중동보주장적삼수설정대우공제지표침강기관건작용.동보주장전충효과불가회도치순미상방교대범위내지표침강발전명현,거리순미월근,침강속솔월대,이전충효과교호시,지표침강가이득도유효공제,Peck 공식비교괄우순미간극전충효과불가적정황.령외,감측수거게시,순구정추과정중초공극수압력축점소산,지표침강지속발전,거리순미월근적위치지표침강발전속솔월대.
Controlling the impact on the environment is the key point for the earth pressure balance (EPB) shield construction. Based on the Yingbinsanlu tunnel project constructed by the f14.27 m earth pressure balance shield in Shanghai, field measurement is executed to study the development and distribution of the ground settlement and the relationship between the ground settlement and construction parameters. According to analyzing the measured data, it could be found that the underlying law of the ground settlement development is determined by the chamber pressure and synchronization grouting parameters. Bad filling effect of the synchronization grouting may lead to obvious development of ground surface settlement in a large region and the settlement rate of ground surface above the shield tail is maximum. Good filling effect of the synchronization grouting could effectively control the ground surface settlement. The Peck formula is suitable for the bad filling condition. In addition, measured data reveal that pore pressure would dissipate which leads to the gradually development of the ground surface settlement; and the settlement rate of ground surface above the shield tail is maximum during a long-time standstill of the EPB shield.