| In order to solve the problem of local slip and collapse of ditch slope from agricultural irrigation and drainage project in Yellow River irrigation area of Ningxia,this thesis has explored the application of geo-textile bags technique to stabilize the slope of agricultural ditch.Firstly,an overview on the design and construction method was introduced to proctect the agro-ditch with geotextile containers for high standard farmland construction project from Dong Fanghong Village,Shaogang town where is located to Qing Tongxia irrigation area of Ningxia.Then the plan was formulated,and the equipment were installed so as to conduct monitoring survey task.The data were analyzed and discussed based on the information of prototype monitoring experiment from November,2016 to November,2017.And the results were compared to the monitoring data of traditional way which reinforces slope with grass-soil and wood-pile on the agro-ditch at same term.The main conclusions are as follows:(1)according to the characteristics of farmland drainage ditch slope,the design and construction method was presented and the survey data showed that the programme is feasible from information more than a year.(2)putting forward the detail scheme of farmland drainage ditch slope monitoring,the lateral errth pressure,earth displacement,soil moisture,pore pressure,groundwater and water table were surveyed on the ditch section from the test site of monitoring experiment,which can be provided the reference to analyze landslide deformation of agro-ditch.(3)the analysis from monitoring data show that the earth pressure increase quickly between 50 cm to 100 cm under the ditch slope where is the location within regime range of groundwater and ditch flow.And the position of the slope is possbile unstable site.It can be as the index to design the paving slope of agro-ditch through analysing the potential slide position based on erath pressure of rmonitoring experiment.(4)in the process of groundwater seeping to agro-ditch,geo-textile containers can relieve the seepage pressure keeping the slope stability due to the characters of filtrating water and retaining soils of geo-textile containers,and the pore pressure keep smooth from the site test data.(5)in three slope protection ways of pulp stone paving,grass soil pile revetment and geo-textile bags paving,monitoring results showed that the slope internal displacement change of geotextile bags is small due to set geo-textile sand gravel containers as anti-sliding body preventing the slope collapse effectively in the slope toe,in addition,reducing the slope foot was scoured by sueface flow and keeping the good permeability.It has the advantage of showing more stable to ditch slope than original mode of grass-soil and wood-pile. |
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