膨胀土含水量记忆膨胀模型  

Water content memorized expansive model of expansive soils

作　　者：孙即超[1] 高全臣[1] 杨永琦[1] 周富华 刘飞[3] 

机构地区：[1]中国矿业大学力学与建筑工程学院,北京100083 [2]广西交通科学研究所,南宁530001 [3]北京建筑工程学院土木系,北京100044

出　　处：《岩土力学》2006年第S1期99-102,共4页Rock and Soil Mechanics

摘　　要：在现场施工过程中膨胀土切坡很稳定,但当降水时膨胀土遇水膨胀,发生破坏,挖除坍滑的部分,切坡遇雨又继续破坏,不断往复,针对这一实际情况,结合以往的杆件单元模型提出了膨胀土的含水量膨胀模型。膨胀模型在外力作用以及历史上的最大含水量作用下对最大含水量具有记忆性,外力卸除,表现出一般土的特性,只有再次来临的含水量大于历史上的最大含水量时,才表现出膨胀土所特有的膨胀性。给出了此模型的应力-应变关系,与以往的弹塑性硬化体所不同之处的直观上的表现在于,此模型的应力-应变关系曲线整体发生了向左移动。In the field construction,the expansive soil cut slope is very stable,but during or after a rainfall,it is destroyed.After the destroyed part is dug,the slope is destroyed again when a rainfall comes again.It happens again and again according to the above course.So the paper gives a water expansive model of expansive soils.The model memorizes the max water content in the history under some certain stress,and it has stored much energy.When the stress is removed,the expansive soil is deformed only according to the stress-strain curve of the general soils.But when a rainfall comes,the model begins to show its nature of expanse.The paper gives the stress-strain curve and the elastic modulus formula,which is different to the one of the before elastoplastic hardening model, and the difference is obvious;and it is obtained after removing the strain-strain curve of the general elastoplastic hardening model to the left some distance.

关 键 词：膨胀土 含水量 记忆模型 弹塑性硬化体 

分 类 号：TU443[建筑科学—岩土工程]