Experimental Study Of Environmental Change Effects On The Structral Strength Of Marine Soft Soil

For the sake of studying the characteristics of environmental change on strength of marine soft soil structure,in this paper,the marine soft soil of Fangchenggang Guangxi reclamation area is studied,using mechanism simulation technology to simulate the change of the environment of marine soft soil and the element of environmental change is marked on the artificial preparation.In this paper,to get the artificially prepared samples of conventional physical and mechanical tests and analysis the influences of environmental change on the physical and mechanical properties of marine soft soil;through the interior structural mechanics test get occurrence environmental change marine soft soil structure strength;the freeze-dried samples are prepared by mercury injection test.Analysis occurrence environment change sea product pore structure change rules of marine soft soil.Finally,this paper discusses the relationship between the pore fractal dimension and the structure strength of marine soft soil under different occurrence environment.From two angles of macro mechanics and micro view,the influence of environmental change on the strength of marine soft soil structure is studied comprehensively.This article research content and research results mainly includes following parts:1.With a fifty-days period of "immersion-loading" linkage research,so that the marine soft soil is marked by environmental factors.In the process of making samples,it is found that the change of environmental factors will have a certain effect on the settlement characteristics of marine soft soil.2.Through to artificially prepared samples are ion concentration test,permeability test and direct shear test,the following conclusions are obtained:the increase of Ca²⁺ concentration in soaked liquid will affect the exchange of the chemical components(e.g.Ca²⁺and Mg²⁺)between the soaking solution and the marine soft soil.;with the increase of Ca²⁺concentration in soaking liquid,marine soft soil permeability coefficient decreased;the increase of Ca²⁺concentration in soaking plays a certain role in promoting on marine soft soil shear strength index c value and φ value.3.Through the structural mechanics test（one-dimensional consolidation compression tests）on the man-made preparation and the reconstituted sample,can be drawn:with the increase of the calcium ion concentration in the soaking solution,marine soft soil structure yield stress and structural strength are improved.4.Through the mercury intrusion test is applied to study the pore characteristics of artificial preparation and study marine soft soil pore size and distribution in different occurrence conditions,discusses the relationship between the pore fractal dimension and the structure strength,from the view of micro-structure sea product strength of the soft soil structure formation mechanism is analyzed.