CAJ | 학술논문

目前关于深浅式异形基坑的开挖并未形成专门的规范，针对此类工程的施工方法及其相应的地表沉降特点仍不明确。为了解决这些问题，研究以北京地铁6号线车站基坑为背景展开讨论，研究利用有限差分软件建立数值模型，对比常见开挖工法的地表沉降控制能力，认为先浅后深的方法在该工程的支护条件下最为有效。在此基础上，研究进一步分析先深后浅、先浅后深、同步开挖3种工法在分步开挖条件下的地表沉降特点，总结两侧地表最大沉降值的变化规律。
목전관우심천식이형기갱적개알병미형성전문적규범，침대차류공정적시공방법급기상응적지표침강특점잉불명학。위료해결저사문제，연구이북경지철6호선차참기갱위배경전개토론，연구이용유한차분연건건립수치모형，대비상견개알공법적지표침강공제능력，인위선천후심적방법재해공정적지호조건하최위유효。재차기출상，연구진일보분석선심후천、선천후심、동보개알3충공법재분보개알조건하적지표침강특점，총결량측지표최대침강치적변화규률。
At present, there is no special specification for the excavation of deep-shallow special-shaped foundation pit, and the construction methods and surface settlement characteristics are defined. To solve these problems, this paper addresses the issue with based on the construction of Beijing Metro Line 6 station. The finite differential software is employed to establish a numerical model to compare the ability of common construction methods to control surface settlement. The results show that the method of“shallow to deep excavation” is most effective in the construction where supporting is provided. On this basis, further analyses are conducted to study surface settlement control with such three methods as“first deep then shallow, first shallow then deep, and synchronized excavation” and variation laws of the maximum surface settlement on both sides are derived.