基于贝叶斯–粒子群优化算法的污染场地隔离墙阻隔效果CPTU原位评价方法

doi:10.13722/j.cnki.jrme.2022.0396

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Abstract Hydraulic impermeability and homogeneity should be ensured before the newly built cutoff walls put into operation. The difficulties of the rapid evaluation of the cutoff walls lie in the high-quality sampling and time-consuming laboratory testing. In this study，piezocone penetration test(CPTU) is used to evaluate the barrier performance of a newly built cutoff wall. Based on the correlation analysis between excess pore water pressure and horizontal permeability coefficient，the random field theory is used for modeling，and the model parameters are defined to quantitatively describe the impermeability defects. Bayesian approach combined with particle swarm optimization is used to solve the model parameters，which realizes the rapid identification of impermeable defect layers and quantitative characterization. Comparing with the stratification results of traditional Robertson soil behavior type(SBT) method，the inapplicability of SBT method in evaluating the goodness of cutoff wall is pointed out. Finally，combined with the CPTU pore pressure dissipation test results，the continuous horizontal permeability coefficient profile of the cutoff wall is evaluated. Results show that the proposed CPTU in-situ evaluating method based on the excess pore water pressure can identify the impermeable defect layers and quantitively reflect its causes. The analysis results can be used as guiding information for making remediation plans.

Key words： soil mechanics cutoff wall piezocone penetration test excess pore water pressure Bayesian approach

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	Articles by authors
	WU Meng1
	ZHAO Zening1
	WANG Caijin1
	CAI Guojun1
	2

Cite this article:

WU Meng1,ZHAO Zening1,WANG Caijin1, et al. In-situ evaluation of barrier performance of cutoff wall based on Bayesian-Particle swarm optimization using piezocone penetration test [J]. , 2023, 42(2): 483-496.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0396 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I2/483

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