黏性土起动研究现状综述

综述国内外学者在泥沙起动(包括散体沙的起动和新淤土的起动)研究和黏性土的起动模式、影响因素等方面的研究成果,指出各研究者、研究思路、研究成果的差别,以及现有研究成果所存在的问题:由于黏性土本身的复杂性,加之各研究者考虑的参数不尽相同,现已建立的黏性土起动模式差别较大;影响黏性土起动的因素主要有土的物理因素、土力学参数、化学特性等.认为今后的研究重点应放在黏性原状土上,在此基础上再进行重塑土试验,以探求各影响因素等起动切应力之间的关系,进而分析黏性土起动机理及其影响因素,确定黏性土起动的物理模式,并选择足够的土样,通过大量的水槽试验,积累资料,从中分析综合内在规律.

Summarization of cohesive soil initiation

A summary was made of the advances in research at home and aboard on sediment initiation(including the loose sediment and newly sedimentary soil),the initiation model,and some affecting factors.The thoughts of and results from different research works in this area were compared,and some problems existing were listed.Owing to the complexity of cohesive soil and the different parameters adopted in different research works,the initiation models of cohesive soil,which have been developed in former research works,are of great differences. The factors affecting the initiation of cohesive soil mainly lie in the physical factors,geomechanical parameters,and chemical characteristics.It is considered that,in the further study,the emphasis should be placed on the undisturbed cohesive soil,and that manipulated soil tests should be performed to find the relationship between each affecting factor and the shear stress of initiation,to analyze the mechanism of cohesive soil initiation and its affecting factors,and further to determine the physical model.Thus,the inherent law can be found by information accumulation of enough soil samples from great amount of flume tests.