Based on field test and theoretical analysis , the mechanism of instability of slurry - supported excavations was investigated from angles of soil arching effect , time - dependent effect , overall stability , and local stability 同時,根據(jù)現(xiàn)場試驗和理論研究成果,從土拱效應(yīng)、時間效應(yīng)、整體穩(wěn)定性和局部穩(wěn)定性等方面分析了泥漿護壁開挖的失穩(wěn)機理。
Based on the available rule of variation in undrained shear strength during excavation , and the basic idea of the merchant model , this paper presents a constitutive relationship for saturated cohesive soils , capable of taking into account both stress path and time - dependent effect . it ' s named by the author as modified merchant model 本文根據(jù)前人基坑開挖前后土的不排水抗剪強度變化規(guī)律的研究結(jié)果,并結(jié)合merchant模型的思想,提出了能同時考慮開挖應(yīng)力路徑和應(yīng)力應(yīng)變隨時間變化的飽和粘土應(yīng)力應(yīng)變關(guān)系,亦可稱之為修正merchant模型。