The Research And Numerical Analysis On The Elevated And Expanded Plan Of Soda Dam In A Soda Plant

Soda ash is an important basic chemical raw material.Most alkali plants at home and abroad use the ammonia-alkali method(Solvay method)to produce soda ash.In the process of making alkali,a large amount of waste residue is generated.Most alkali factories store alkali residue in the form of building the dam.The dam body has a high safety risk because of the special engineering characteristics of alkali slag.The safe operation of alkaline slag dam is closely related to people’s lives and property safety,so maintaining the stability of alkaline slag dam is crucial.In addition,with the increase of soda ash production capacity,alkali-making waste residues are increasing.But it is accompanied by higher and higher land prices.Therefore,based on the original alkali residue field,it is of great practical significance to safely and effectively increase and expand the alkali residue dam.The alkali slag dam is a kind of tailings dam.This paper first briefly introduces the relevant research methods and current status,including the physical and mechanical indicators of alkali slag,domestic soft ground treatment and tailing dam stability analysis.After that,the engineering investigation and on-site inspection were carried out on a certain alkali slag filed.We collected geological data of alkali slag dam,analyzed the stability of the dam body under the action of seepage,and studied the design of the plan for heightening and expansion.The main work of this paper is as follows:(1)Two sections were selected based on the geological survey report of the alkali slag field.According to the relevant material parameters,ABAQUS was used to establish the corresponding calculation model to analyze the stability of the current slope under the seepage.The results show that the current infiltration line in the dam is at a high position,which is not conducive to the stability and safety of the slope.The stability coefficients of the slopes are all around 1.1,and the stability coefficients on the seaside are lower than 1.15 as required by the code.(2)According to the above analysis results,the method of combining the addition of high-pressure rotary jetting piles and drainage and seepage systems is used to reinforce the dam body,and the corresponding heightening and expansion plan is designed.(3)The ABAQUS and Lizheng software were used to analyze the seepage and stability of the heightened dam body.ABAQUS uses the fluid-solid coupling method to obtain the corresponding infiltration surface,and then uses the strength reduction method to calculate its safety stability factor.The Lizheng software uses the two-dimensional finite element method for seepage calculation,and the Swedish slice method for stability calculation.The calculation results of the two are similar,and the slope stability coefficient is greater than 1.15,indicating that the scheme is safe and feasible.