早期人防隧硐工程泡沫混凝土现浇回填施工应用研究  

Application of Foam Concrete in Backfill of Abandoned Civil Air Defense Tunnel

作　　者：马永政[1,2] 温小栋 冯蕾[1] 张振亚 王赛赛[1] MA Yongzheng;WEN Xiaodong;FENG Lei;ZHANG Zhenya;WANG Saisai(Ningbo Institute of Engineering,Ningbo 315016;Zhejiang Research Center for Civil Engineering and Industrialization of Construction Engineering Technology,Ningbo 315016)

机构地区：[1]宁波工程学院,浙江宁波315016 [2]浙江省土木工程工业化建造工程技术研究中心,浙江宁波315016

出　　处：《土工基础》2021年第5期553-556,共4页Soil Engineering and Foundation

基　　金：浙江省基础公益项目(LGF19E080004);宁波市人民防空办公室公益项目(201701)。

摘　　要：针对沿海软土地区城市内废弃的早期人防隧硐工程回填治理问题,探讨研究采用泡沫混凝土现浇回填施工技术措施。首先明确了早期工程治理对应的泡沫混凝土回填设计指标,通过室内材料实验,确定采用的水泥、粉煤灰以及发泡剂、外加剂等的用量配合比;接着进行与实际隧硐比例尺为1∶1的模型实验,通过回填充盈性、表观完整性等回填体质量检测,以验证现场施工搅拌技术措施有效性。最后进行现场工程示范,对施工过程回填体温度压力和软土地基沉降影响变化进行监测,对地下水环境下的回填体容重强度指标长期变化,进行跟踪取样检测分析其耐久性,结果表明施工过程需要适当控制水化热,泡沫混凝土长期耐水性能良好,对地基沉降等环境影响可忽略。In order to resolve the problem of backfill treatment of the abandoned civil air defense tunnels in the coastal soft soil area,this paper presents the construction measures of the cast-in-place foam concrete as the backfill material.The targets of the foam concrete backfill in the abandoned tunnels are defined.Throughout the laboratory material tests,the mix ratios of cement,fly ash,foaming agent and other additives were determined.Then,the 1:1 cross-section model test of the tunnel was performed to verify the degree of filling,apparent integrity,and the effectiveness on-site mixing measures.Finally,apilot demonstration backfill tunnel was carried out to monitor the temperature and pressure changes in the backfills,the settlement of soft soil foundation during the construction process,and the long-term variation of backfill density under the groundwater.The results show that the hydration heat and the foam concrete should be properly controlled;the long-term water resistance performance during the construction is acceptable,and the environmental impact of the foam concrete is minimal.

关 键 词：早期人防工程 泡沫混凝土 回填治理 耐水性 环境影响 

分 类 号：TU433[建筑科学—岩土工程]