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阐述了软土地区某基坑由于地下室增加一层,在基坑原支护墙已施工完成情况下的加固措施。充分利用已有支护结构,在其内侧增设排桩形成复合支护结构,以满足稳定性要求;利用复合支护减小已施工支护结构所受内力以满足其强度要求;设置底板“倒牛腿”等措施实现新增支护结构对地下室建筑面积的“零侵占”。理论分析及工程实践均证明复合支护结构应用在基坑加深工程中的合理性与适用性,本工程取得的经验对于类似工程具有借鉴意义。
The reinforcement measures of a foundation pit in the soft soil area due to the addition of a basement in the basement have been described. Make full use of the existing support structure, in the inner side of the row of piles to form a composite support structure to meet the stability requirements; use of composite support to reduce the construction support structure suffered internal force to meet the strength requirements; set the floor Inverted Leg “and other measures to achieve the new support structure of the basement floor area ” zero invasion ". Both theoretical analysis and engineering practice prove the rationality and applicability of composite supporting structure applied in deepening of foundation pit. The experience gained in this project can be used as reference for similar projects.