Evaluation of the Environmental Impact due to the Geotechnical Utilization of Waste Materials

为促进废弃物的岩土工程利用，减少地面污染，对废弃物再利用的地质环境影响进行了评价。（1）系统地总结和总结了大量的岩土工程废弃物利用技术和危险化学品地面污染控制技术，主要是在设计方法方面。(2)通过几种浸出试验方法，评价了废弃物岩土工程利用对环境的影响。主要关注的是测试协议，包括废物的粒度和暴露于水的条件，以模拟原地浸出行为。通过室内试验研究了pH值和氧化还原对重金属淋溶量的影响以及土壤对重金属的衰减能力。(3)在室内淋滤试验的基础上，提出了废弃物再利用和处置对地质环境影响的简化评价方法。减少环境影响的各种措施的有效性（例如，过滤层，废物的稳定，或粘土衬里）进行了评估，使用所提出的方法。(4)提出了评价填埋场衬垫（土工膜、粘土衬垫、复合衬垫）性能的方法，重点研究了双层衬垫系统的效果。基于所提出的方法进行的参数研究，提出了内陆和海上垃圾填埋场的合适衬垫结构。

Evaluation of the geo-environmental impact due to the reuse of waste materials was studied to promote the geotechnical utilization of them and minimize the ground contamination. The main results obtained by this study can be summarized as follows : (1) A lot of techniques to utilize the waste materials in geotechnical applications and control the ground contamination with hazardous chemicals were developed and summarized systematically, mainly in aspect of the design method. (2) Environmental impact due to the geotechnical utilization of waste materials was evaluated through several leaching test methods. The main concern is given to the testing protocols, including the particle size of waste and the conditions exposing to water, to simulate the in-situ leaching behavior. The pH and redox effects on the leaching amount of heavy metals and the attenuation capacity of soil were also assessed by laboratory tests. (3) Simplified methods for evaluating the geo-environmental impact due to the reuse and disposal of waste materials were proposed based on laboratory leaching tests. The effectiveness of various measures to reduce the environmental impact (e.g., filtration layers, the stabilization of wastes, or clay liners) was evaluated using the proposed methods. (4) The methods for evaluating the performance of landfill liners (geomembrane, clay liner, composite liner) were also proposed with the focus on the effectiveness of the double liner system. An appropriate liner structure of the inland and offshore landfill sites was proposed based on the parametric studies using the proposed methods.