注气增压作用下的软土排水增效机理试验研究  

Experimental Study on Drainage Efficiency Enhancement Mechanism of Soft Soil Under Air-injection Pressurization

作　　者：梁泽龙 谢立全[1] 顾宽海 江波 LIANG Zelong;XIE Liquan;GU Kuanhai;JIANG Bo(College of Civil Engineering,Tongji University,Shanghai 200092,China;CCCC Third Harbor Consultants Co.,Ltd.,Shanghai 200032,China;Shanghai Real Estate North Investment Development Co.,Ltd.,Shanghai 201907,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中交第三航务工程勘察设计院有限公司,上海200032 [3]上海地产北部投资发展有限公司,上海201907

出　　处：《同济大学学报（自然科学版）》2023年第8期1251-1258,共8页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(51479137)。

摘　　要：通过重塑土的一维物理试验研究了软土注气增压排水效果的内在机理。试验系统包括增压装置、软土压密(劈裂)观测装置、排水量测量装置等。随后观测了软土沉降、排水过程及裂隙发育特征。结果表明:压力气体通过孔隙水的驱替与孔隙的弹塑性扩张实现土体排水压密与劈裂,同时结合表层土体的明显薄弱特征(或裂隙)、平整密实程度,可将注气增压作用下的软土排水增效机理分为排水且劈裂、排水并压密与排水且贯通3种排水增效机制。In this paper,we investigate the inherent mechanism of the drainage effect of soft soil under airinjection pressurization through one-dimensional physical tests on the remolded soil.The experimental system includes pressurization devices,soft soil compaction(fracture)observation devices,drainage measurement devices,etc.Then,we observe the settlement of the soft soil,the drainage process,and the crack development characteristics.The results show that the pressure gas achieves the drainage compaction and fracturing of the soil by displacing the pore water and elastically expanding the pores.Combined with the obvious weak characteristics(or cracks)and the degree of surface soil compaction,the drainage enhancement mechanisms of soft soil under air injection pressurization can be divided into three types:drainage with fracturing,drainage with compaction,and drainage with permeability.

关 键 词：真空预压法 注气增压 软土 排水 劈裂 沉降 

分 类 号：TU447[建筑科学—岩土工程]