Study On Stability Analysis And Engineering Measures Of Reclaimed Paddy Field In Slag Field Under Saturated Condition

Part of the temporary land of the construction project occupies the permanent basic farmland for inevitable reasons.According to the relevant national codes and regulations,it must be land reclamation after the expiration of the period,and the principle of "occupy one,make up one,occupy the superior and make up the superior" must be strictly observed.If the paddy field in the permanent basic farmland is occupied,it needs to be reclaimed as paddy field on its original site.For example,some important linear engineering slag field occupy permanent basic farmland and are all paddy fields.In order to ensure that the area of paddy fields will not be reduced after reclamation,the slag field need to be designed as vertical slope slag field.Therefore,it is very necessary to analyze the stability of slag field that need to be completely reclaimed paddy fields.In this paper,FLAC3 D simulation calculation software is used to establish single bench slag field and multi-step bench slag field with different heights on the cultivated land around similar linear projects.The stacking amount of single bench slag field and multi-step bench slag field corresponds to each other.Pile sheet wall is selected for support.The maximum stacking height of single bench slag field and multi-step slag field and the optimal pile section size of pile sheet wall are explored,and the single bench slag field and multi-step slag field are comprehensively analyzed,Finally,combined with the simulation results and analysis conclusions,a slag field of a project is designed.The main conclusions are as follows:Under natural conditions,the maximum stacking height of the single bench slag field is21 m on the cultivated land around such similar linear projects;The maximum stacking height of the three bench slag field is 27 m,and its stacking amount corresponds to the stacking amount of the 25 m high single bench slag field;The maximum stacking height of the five bench slag field is 35 m,and the stacking amount corresponds to the 31 m high single bench slag field;The maximum stacking height of the seven bench slag field is 40 m,and its stacking amount corresponds to the 33 m high single bench slag field.Under the saturated condition,the maximum stacking height of the single bench slag field is 19 m on the cultivated land around such similar linear projects;The maximum stacking height of the three bench slag field is 21 m,and its stacking amount corresponds to the stacking amount of the single bench 19 m high slag field;The maximum stacking height of the five bench slag field is 25 m,and the stacking amount corresponds to the 21 m high single bench slag field;The maximum stacking height of the seven bench slag field is 29 m,and its stacking amount corresponds to the 23 m high single bench slag field.Compared with natural conditions,the maximum amount of slag piled up in the slag field with different number of steps under saturated conditions decreases,and with the increase of the number of steps,the decrease of the maximum amount of slag piled up in the slag field increases.Under natural and saturated conditions,with the increase of the number of steps in the slag field,the maximum amount of slag piled in the slag field will increase.However,with the increase of the number of steps under the same amount of slag,the floor area of the slag field and the quantities of pile sheet wall measures will increase.During the design of the slag field,the slag field shall be designed as single bench slag fieldunder the condition of ensuring the stability of the slag field;If the single bench slag field cannot be stable,the slag field can be designed as a multi bench slag field,and priority should be given to the slag field with few steps.Finally,combined with the results of numerical simulation,two slag field occupying permanent basic farmland generated by a linear project are designed.On the premise of ensuring the stability of the slag field,1# slag field is designed as a single bench slag field16.97 m high slag field,and 2# slag field is designed as a five step 24.71 m high slag field,which saves land resources and engineering measures.In this paper,the stability and engineering measures of vertical slope slag field in reclaimed paddy field are studied,which provides a reference for similar projects in the future.