摘要
针对工程上涉及的大量缩孔现象,从土的基本工程性质出发,考虑土的应变软化特性和不相适应流动法则,推导了建立在弹性-软化-塑性模型基础上的柱形孔和球形孔收缩的弹性区、软化区和塑性区的解析解,给出了卸载压力与塑性区半径和软化区半径之间的关系。研究了反映软化特性的参数对计算结果的影响,并与理想弹塑性材料进行比较,克服了在弹塑性交界处p/p_0与r/r_0出现突然转折的缺点。
For lots of contracting phenomenon in practice, analytical solutions are presented for contraction of both cylindrical and spherical cavities from in-situ state of stresses under undrained conditions. The non-associated Mohr-Coulomb model and strain softening are taken into consideration. The relationship between the unloading pressure with the radius of plastic flow zone and softening zone is obtained. The effect of the parameters of strain softening on the results is investigated. Compared with the results of perfectly elastic and plastic model, the present solution can avoid the sudden turning in the curves of the normalized support pressure and the normalized radius at the boundary of elastic and plastic zone.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2002年第A02期2432-2438,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
浙江省自然科学基金青年人才专项基金(RC9609)
关键词
土力学
应变软化
缩孔
摩尔-库仑准则
塑性流动区
软化区
soil mechanics
strain softening
contracting cavity
Mohr-Coulomb criterion
plastic flow zone
softening zone
