摘要
对土压平衡盾构渣土出土量进行准确评估,有利于渣土处理处置工艺、处理能力、处理成本的确定。基于土力学中土的三相组成理论分析了渣土松散特性计算原理并推导出评估公式,形成土压平衡盾构渣土松散特性的评估方法。结合土工试验(密度和含水量试验),采用该评估方法测定出松散系数,并与工程计量结果进行对比分析,结果显示:不考虑地层不均和塑流化过程的渣土松散系数为1.50,只考虑地层不均的松散系数为1.52,只考虑塑流化的松散系数为1.53,同时考虑地层不均和塑流化过程的松散系数为1.54,工程实际计量所得松散系数为1.64。由此可见,塑流化过程是主要因素,地层不均为次要因素,其结果与现场计量结果虽有差距但考虑地层不均和塑流化过程的松散系数与之趋近。该方法为渣土松散系数的确定提供一种新的方法和思路,同时为渣土量的准确预测提供基础数据的获取方法。
Accurate assessment of the EPB shield slag is conducive to the determination of the slag treatment process,treat-ment capacity,and treatment cost.Based on the three-phase composition theory of soil in soil mechanics,it analyzes the calculation principle of the loose characteristics of slag soil and deduces the evaluation formula,and forms the evaluation method of the loose char-acteristics of the slag soil of EPB shield.Based on the geotechnical test(density and water content test),the coefficient of looseness was determined by this evaluation method and compared with the engineering measurement results.The results show that the loose coeffi-cient of the slag soil without considering the formation unevenness and plastic fluidization is 1.50,the loose coefficient only consider-ing the formation unevenness is 1.52,the loose coefficient only considering the formation plastic fluidization is 1.53,the loose coeffi-cient considering the formation unevenness and plastic fluidization is 1.54,and the loose coefficient obtained by the actual measure-ment of the project is 1.64.It can be seen that the plastic fluidization process is the main factor and the formation unevenness is the sec-ondary factor.The results are in good agreement with the actual measurement results.This method provides a basic data acquisition method for the accurate prediction of the amount of residual soil.
作者
邓烨
李懿
陈益人
郑好
李露露
蒋雨露
Deng Ye;Li Yi;Chen Yiren;Zheng Hao;Li Lulu;Jiang Yulu(R&D Center,San-chuan De-qing Technology Co.,Ltd.,Wuhan 430070,Hubei,China;Guangzhou Railway Polytechnic,Guangzhou 511300,Guangdong,China)
出处
《岩土工程技术》
2023年第6期644-648,共5页
Geotechnical Engineering Technique
基金
广州市博士后科研项目(62216246)
中国冶金地质总局科研项目(CMGBK202109)。
关键词
土压平衡盾构渣土
地层不均
塑流化
评估方法
EPB shield slag
stratum unevenness
plastic fluidization
evaluation method
