Design And Reclamation Adaptability Evaluation For Abandoned Dreg Field And In Highway Construction

Highway industry is expanding in our country, which will cause adverse effect on ecological environment quickly inevitably. Highway construction construction process produces a large number abandon slag, which destroyed the original vegetation and applied the slope stability, formed a new source of soil and water loss, serious impact on the environment and applied ecological balance. And if abandon residue processes improper, the damage will be greater. The current highway design and reclamation slag games have often only pay attention to the theoretical design measures and from the region ecological environment and projects of the combination of features, the design of identity often makes engineering soil and water conservation and land reclamation was less than very good effect of ecological restoration. At present, for soil and water conservation and the rationality of the design of land reclamation suitability is still not better discriminant analysis method. The fuzzy comprehensive evaluation method has both the strict quantitative score, but also to difficult to the quantitative analysis of fuzzy phenomena of subjective qualitative description, the qualitative description and quantitative analysis closely combined, it is a more suitable for stability comprehensive evaluation method of evaluation, and is also developing rapidly in recent years, a new method of fuzzy comprehensive evaluation method to highway running in soil and water conservation and land reclamation discriminant analysis has wide application prospects.On the basis of research on current situation of temporary occupation project of the Chengdu-Chongqing Expressway (Chongqing section), using four types of soil and water conservation technical parameters in abandoned dreg field of the existing freeway as the sample, and adopting a single-factor analysis based on fuzzy comprehensive analysis method, soil and water conservation stability and reclamation of temporary occupation of highway are reflected objectively, and a comprehensive evaluation of soil and water conservation design and land reclamation are made ultimately. The results show that:Based on fuzzy comprehensive evaluation, suitability of temporary occupation project of the Chengdu-Chongqing Expressway is evaluated.2m,3m retaining Wall of Bishan shows significantly great stability.2m,3m Retaining Wall of Bishan is artificial accumulated slope with high quality soil, a layered type, is unlikely to happen to the sliding of the soil along the top surface of the bedrock and within soil, which have great stability and strength; 4m retaining Wall of Tongliang and 5m retaining wall of Dazu show great stability, with relatively low shear strength, which is easy to form a debris flow or gravel flow under heavy rainfall, and may occur sliding damage along the underside of the retaining wall and sliding damage within soil. On the other hand, safety factor of the composite sliding surface formed by the underside of the slope and in the internal soil sliding have (?) the regulatory requirements, and the slope is unlikely to collapse, so the stability and strength of the (?)aining wall are great. On the whole, soil of experimental block in Chengdu-Chongqing Expressway (Chongqing section) have high permeability coefficient, and take the drainage measures can effectively reduce underground water level in internal slope. Retaining wall of Bishan, Tongliang and Dazu can reduce underground water level and change slope shape to enhance stability of slope geologic body and improve slope stability. Overall, into chongqing highway (chongqing boundary) within each experimental block soil permeability coefficient is bigger, take drainage measures can effectively reduce the slope body internal underground water level. Bishan section, TongLiang section, DaZu period of slag wall all is to reduce the groundwater level and change shape and improve the slope way own stability of slope geological body stabilization measures to improve the stability of the slope. Slag wall have the support of the games as slag structure, and its stability will directly affect the stability of the slope abandon slag field. In the block the slag wall slope toe setting retaining structure, and the slope of prestressed anchor for reinforcement, can further improve slag wall overall stability, slag wall along the bottom slip and slide the safety of internal damage. To increase abandon slag field and the overall stability of slag wall, close to the slag wall face casting downstream number two concrete retaining wall, the wall and slag wall to wall at the top.Soil moisture, nutrients and organic matter content of experimental block in Bishan are the highest, that of Tongliang are the second highest, and that of Dazu is the lowest. In the same experimental block, with deepening of soil depth, soil moisture, nutrient content and soil organic matter content reduced. Soil moisture, nutrients and organic matter content are important indicators for the characterization of soil nutrients. Experimental block in Bishan and Tongliang have high soil moisture, nutrients and organic matter content, also with high soil nutrient. Land quality of Bishan and Tongliang is improved after reclamation, indicating land reclamation adaptability of Bishan and Tongliang is significantly great. Experimental block in Dazu has relatively low soil moisture, nutrients and organic matter content, and physicochemical property and farming improvement status of land still need to be improved after reclamation, having great land reclamation adaptability. Using fuzzy comprehensive evaluation method, nutrient data from four typical blocks of three different test blocks of temporary occupation project in the Chengdu-Chongqing Expressway (Chongqing section) is analyzed, and show that Bishan and Tongliang are greatly suitable for reclamation, and Dazu is suitable for reclamation. Through the evaluation example show that the fuzzy comprehensive evaluation method to abandon slag field reclamation comprehensive assessment, theoretically more rigorous, can more accurately reflect the land reclamation suitability. Due to the influence of different factors in soil degree of difference, only from the test data is very hard to distinguish between the difference on, and fuzzy comprehensive evaluation method can make full use of limited test data, the judge can clear land reclamation suitability. Through the membership and weight stack and objectively the land grading boundaries and land reclamation suitability, noticed the fuzziness of the actual line, can reflect the influence degree of reclamation of different factors on the influence of the reclaimed land, which made the assessment close to the objective. The fuzzy comprehensive evaluation method for land reclamation suitable assessment to a scientific discriminant reclaimed land suitability degree. Research results can for the new highway construction engineering soil and water conservation design rationality and land reclamation suitability of provide guidance and reference.