CAJ | 학술논문

坑中坑是非常普遍却未能进行系统研究的基坑工程问题，其自身形态的多变性不但给设计、施工带来了一定的难度，更增加了其影响范围内地层变形的复杂性。通过对虚拟开挖线和功能土体的假设阐述了坑中坑周边地层变形产生差异的原因及其力学机制；结合地层损失法和相关的经验公式提出了适用于北京地区坑中坑工程的地表沉降曲线及最大沉降值的预测方法；在此基础上将之与数值模拟法及经验公式法进行比较，分析了所提预测方法的合理性与适应性，并得出了坑中坑周围地表沉降对内坑开挖深度最为敏感的结论。研究成果可以指导北京地区及其他地区同类基坑的设计与施工，对防止工程事故、避免资源浪费意义重大，同时也为城市坑中坑工程建设对周边环境影响的精细化控制提供了参考。
갱중갱시비상보편각미능진행계통연구적기갱공정문제，기자신형태적다변성불단급설계、시공대래료일정적난도，경증가료기영향범위내지층변형적복잡성。통과대허의개알선화공능토체적가설천술료갱중갱주변지층변형산생차이적원인급기역학궤제；결합지층손실법화상관적경험공식제출료괄용우북경지구갱중갱공정적지표침강곡선급최대침강치적예측방법；재차기출상장지여수치모의법급경험공식법진행비교，분석료소제예측방법적합이성여괄응성，병득출료갱중갱주위지표침강대내갱개알심도최위민감적결론。연구성과가이지도북경지구급기타지구동류기갱적설계여시공，대방지공정사고、피면자원낭비의의중대，동시야위성시갱중갱공정건설대주변배경영향적정세화공제제공료삼고。
The mode of pit-in-pit is becoming more and more common in foundation pit projects,however,it has not been systematically studied. Its uncertainty in position and shape,on one hand,raises the bar in design and construction,on the other hand,makes the surrounding strata deformation much more complicated. Based on the hypothesis of theoretical excavation line and function mass,the mechanism of difference in surrounding strata deformation was proposed. A prognoses method on curve and the maximum value of ground subsidence which is suitable for Beijing area was put forward combining the theory of ground loss with empirical equations. And on this basis,the reasonableness and adaptability of prognoses method by comparing with numerical simulation method and the empirical method were analyzed. Moreover,conclusion of ground settlement which is sensitive to excavation depth the most was also presented. The research findings can guide the design and construction of similar engineering in Beijing and other areas,and has a great significance in preventing engineering accidents and avoiding wasting resources,which can also be provided as reference material for precise control of impact made by pit-in-pit excavation on surrounding environment.