考虑土体堆积与泥浆压力的地连墙抓斗成槽推压计算方法
曹昱1孟洪峰1王芊1王晓辉2李杰3陈福旦4
Thrust Resistance Calculation Method in Diaphragm Wall Grab Trenching Considering Soil Accumulation and Slurry Pressure
CAO Yu1MENG Hongfeng1WANG Qian1WANG Xiaohui2LI Jie3CHEN Fudan4
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作者信息:1.宁波轨道交通集团有限公司建设分公司， 315101， 宁波
2.中铁一局集团城市轨道交通工程有限公司， 214105， 无锡
3.中铁十一局集团有限公司， 430061， 武汉
4.浙江华展研究设计院股份有限公司， 315012， 宁波
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Affiliation:1.Construction Branch of Ningbo Rail Transit Group Co., Ltd., 315101, Ningbo, China
2.Urban Rail Transit Engineering Co., Ltd. of China Railway First Group Co., Ltd., 214105, Wuxi, China
3.China Railway 11th Bureau Group Co., Ltd., 430061, Wuhan, China
4.Zhejiang Huazhan Research and Design Institute Co., Ltd., 315012, Ningbo, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20253053
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中图分类号/CLCN:TU551.4+2
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栏目/Col:土建工程
摘要:
［目的］随着我国城市轨道交通的快速发展，车站基坑地连墙的开挖深度不断增加，穿越的土层也越来越复杂。地连墙抓斗成方法］针对地连墙液压抓斗成槽施工，分析了挖掘过程中土体的破坏、运动以及堆积特性，在现有模型的基础上引入了斗内土体堆积角以及泥浆压力，利用塑性极限分析方法构建了改进的推压阻力计算模型，并推导出了相对应的计算公式。［结果及结论］槽施工的直接作用对象为土体，抓斗在不同土层中受到的挖掘阻力直接影响施工的成本、成槽质量及效率。但现有研究中针对地连墙抓斗成槽推压阻力的研究较少，多集中在河道疏浚等工程领域，且未能充分考虑斗内土体堆积和泥浆存在对推压阻力的影响。因此需对地连墙抓斗成槽推压阻力计算方法进行针对性研究。［所构建模型计算得到的挖掘过程中抓斗推压阻力计算结果与试验结果间的误差为-0.55%。验证了所推导模型的可用性，同时也证明了计算抓斗推压阻力时考虑斗内土体堆积和泥浆压力影响的可行性与正确性，具有实际应用价值。
Abstracts:
［Objective］ With the rapid development of urban rail transit in China, the excavation depth of station foundation pit diaphragm wall is increasing continuously, and the soil layers that are excavated through is becoming more complex. The direct object of diaphragm wall grab trenching is the soil, and the excavation resistance encountered by grab in different soil layers directly affects the construction costs and trenching quality/efficiency. However, there are few studies on the thrust resistance of diaphragm wall grab trenching, and most of them focus on engineering field such as river dredging, without comprehensively considering the impact of soil accumulation and slurry in grab on thrust resistance. Therefore, it is necessary to conduct targeted research on the thrust resistance calculation method in diaphragm wall grab trenching. ［Method］ Aiming at diaphragm wall hydraulic grab trenching construction, the failure, movement, and accumulation characteristics of soil in the excavation process are analyzed. Based on the existing model, the soil accumulation angle and slurry pressure in grab are introduced, and an improved calculation model of thrust resistance is constructed using plastic limit analysis method, and the corresponding calculation formula is derived. ［Result & Conclusion］ The error between the calculated results of thrust resistance during grab excavation by the constructed model and the experimental results is -0.55%. The availability of the derived model is verified, and the feasibility and correctness of considering the impact of soil accumulation and slurry pressure in grab when calculating grab thrust resistance are also proven, contributing practical application value.
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