【作者】 吕美彤； 赵均海； 姜志琳； 张磊；

【Author】 Lü Mei-tong;ZHAO Jun-hai;JIANG Zhi-lin;ZHANG Lei;School of Civil Engineering, Chang’an University;

【机构】 长安大学建筑工程学院；

【摘要】 基于统一强度理论和非相关联流动法则,考虑中间主应力、软化和剪胀特性的影响,根据与塑性区应力相关的弹性应变推导扩孔过程中的位移场和应变场,利用体积守恒原理推导得到了塑性区半径和极限扩孔压力的理论解。通过算例分析,得出了各参数对柱孔扩张过程的塑性区半径和极限扩孔压力的影响规律:软化特性和剪胀特性能真实的反映土体的真实受力状况,若不考虑其影响,将明显增大极限扩孔压力,工程设计偏危险;考虑中间主应力能更充分发挥材料的强度潜能,节约工程造价。对比可知,剪胀和软化特性比中间主应力对塑性区半径影响更显著。该理论解为柱形扩孔问题的求解提供了理论依据,对工程设计有一定的参考价值。更多还原

【Abstract】 Based on unified strength theory and the associated flow rule,the displacement field and strain field are obtained considering the intermediate principal stress,the influence of softening and dilatancy characteristics,which is associated with the elastic strain of the plastic zone.Using the theory of conservation volume,the radius of plastic zone and the limit pressure of bore hole are deduced.It is concluded that the influence of the parameters on the plastic zone radius and limit pressure through the example analysis.Soften and dilatancy characteristic can reflect the real stress state of soils,and engineering design will be danger without it.It can exert the potential of the material strength,and save the project cost considering the intermediate principal stresst.It is found that dilatancy and softening properties is more significant than the intermediate principal stress on the plastic zone radius.更多还原