粗粒土与结构接触面的静动本构规律  

Monotonic and cyclic constitutive law of interface between structure and coarse grained soil

作　　者：张嘎[1] 张建民[1] 

机构地区：[1]清华大学岩土工程研究所,北京100084

出　　处：《岩土工程学报》2005年第5期516-520,共5页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金资助项目(50279015);北京市自然科学基金重点资助项目(8011002)

摘　　要：进行了系统的粗粒土与结构接触面静动力学试验以研究其本构规律。基于试验得到的宏观和细观测量结果,归纳总结了粗粒土与结构接触面静动力学特性的五条基本规律,即:(1)抗剪强度与法向应力近似成线性关系;(2)在一条法向应力不变条件下的单调剪切应力路径中,剪应力随着剪应变的增加而不断增长并趋向于一稳定值;(3)剪胀体应变由不可逆性和可逆性的体应变分量构成,可逆性剪胀体应变表现出明显的接触面异向性,与剪胀体应变有关的剪应变在总剪应变中所占比例在不同剪切阶段是不同的;(4)压缩性随着法向应力的增大而逐渐降低;(5)受载过程中发生物理状态及力学特性的演化并逐渐趋于稳定。Systematic tests were conducted to investigate constitutive rule of the interface between structure and coarse grained soil. Based on macro- and micro-observation, five essential constitutive rules could be induced to characterize the monotonic and cyclic behavior of such interface. The constitutive rules includes: (1) the shear strength is nearly proportional to normal stress; (2) the shear stress would increase and tend to a stable value with the development of shear strain due to a monotonic stress path application under constant normal stress condition; (3) the volumetric strain due to dilatancy is composed of a reversible and an irreversible dilatancy component. The reversible dilatancy component obviously exhibits anisotropical behavior. The shear strain component related to the volumetric strain due to dilatancy exhibits a variable proportion in total shear strain during shear application; (4) the compressibility decreases with the increase of normal stress; (5) the physical state and mechanical behavior evolve and tend to be stable during shear application.

关 键 词：接触面 力学特性 粗粒土 规律 本构关系 

分 类 号：TU43[建筑科学—岩土工程]