UTILIZATION OF CEMENT-TREATED SOILS BY PLASTIC WASTE

从岩土工程的角度，提出了一种利用塑料废料的方法，认为通过将塑料废料块掺入地面，可以改善软土地基的通过性和稳定性。本研究旨在评估塑胶废料片改良地基的效果，并将其应用于工程实践中。本文的主要研究成果如下：（1）研制了水泥土塑性变形模量的无损检测装置，明确了水泥土塑性变形模量受围压的影响。(2)水泥土的不排水强度随塑料片含量的增加而增加。(3)根据弯曲试验结果，研究了弯曲强度的改善效果。(4)通过对表面加固地基的室内模型载荷试验结果的分析，发现随着塑料片掺量的增加，加固地基的承载力也随之提高。(5)考虑到脆性破坏的影响，可以通过有限元分析来评估塑料件的加固效果。(6)证实了废塑料对水泥土力学性能的改善是有益的。

A method for utilization of plastic waste in a geotechnical point of view, it is considered that trafficability and stability of soft ground are improved by mixing plastic waste pieces into surface of the ground. The purpose of this study is to evaluate improvement effect of the ground with plastic waste pieces and to make use it in a practice. The main conclusions obtained from this study are as follows,(1) The nondestructive testing apparatus for measuring the deformation modulus of the cement-treated soils with plastic pieces was developed and the influence of confinging pressure on the deformation modulus was clarified.(2) The undrained strength of the cement-treated soils increases as the content of plastic pieces increases.(3) The improvement effect in bending strength was investigated based on the bending test results.(4) From the model loading test results of surface stabilized ground, it is found that the bearing capacity of the improved ground increases in increase with the content of plastic pieces.(5) The improvement effect by plastic pieces can be evaluated by FEM analysis in consideration of brittle failure.(6) It is confirmed that the plastic waste is useful for improving the mechanical properties of the cement-treated soils.