Q_2黄土力学性质的研究进展与展望

Review of Recent Studies on Mechanical Properties of Q_2 Loess and Its Research Prospects

对近年来我国学者在Q2黄土的湿陷性、非饱和土力学特性、微细观结构、本构模型以及工程问题处理等方面的研究成果进行了评述,并在此基础上对Q2黄土力学性质的进一步研究进行了分析。分析指出,Q2黄土的湿陷性和结构性本构模型的研究受到了非饱和土仪器设备,微细观试验等方面的制约,还存在一定缺陷;黄土结构性研究应着眼于探求定量化的有效参数以及这一参数的广泛应用;建立参数少且易测定的本构模型是推动黄土工程中数值计算发展的关键;适用于Q2黄土层的地基处理、施工等方面的工程新技术研究不多,且现有的工艺仍需优化。

A review and evaluation of recent studies on Q2loess,including its characteristics as a kind of unsaturated soil,collapsibility,meso-structure and microstructure,constitutive model and engineering problems in practice,is presented. Then a discussion on research prospects of Q2loess is conducted,it is pointed out that studies on the constitutive model and collapsibility of Q2loess fall short,resulting from restrictions as the limitation of apparatus specified for the study of unsaturated soil mechanics and lack of studies on the deformation during loading and wetting through micro-test methods. Emphasis should also be put on both the study of quantificational parameters of soil structure and their application. Constitutive models with less parameters and easy to be determined,also make sense for the development of numerical analysis in engineering practice of loess. Researches on new ground treatment methods and construction techniques specified for Q2loess are in demand,and the existing techniques need to be refined.