【作者】 杨光华； 张玉成； 张有祥；

【Author】 YANG Guang-hua~[1,2],ZHANG Yu-cheng~[1,2,3],ZHANG You-xiang~[2] (1.Guangdong Research Institute of Resource and Hydropower,Guangzhou 510610; 2.School of Civil and Architectural Engineering,Wuhan University,Wuhan 430072 3.The Third Chinese Bureau of Construction Wuhan 430070;)

【机构】 广东省水利水电科学研究院； 武汉大学土木建筑工程学院； 中国建筑第三工程局有限公司；

【摘要】 目前用于边坡稳定的数值分析中的边坡强度折减法通常是仅对强度参数进行折减,且采用的是理想弹塑性模型。该方法未充分考虑岩土破坏屈服前岩土的非线性,采用这种理想弹塑性模型的强度折减法其计算的变形是偏小的,用于现场实测监控是不够的。本文基于Duncan-Chang模型基础上,提出在弹性阶段也对弹性模量进行折减的变模量弹塑性模型强度折减法,可以获得更符合实际的变形场。通过与条形基础沉降的理论解和原位压板试验结果证实新方法的合理性,初步应用于边坡工程的变形计算,并希望由此进一步建立变形与安全系数的关系,以便于更合理进行现场的变形监控。同时,对于采用变形突变来确定安全系数,则理想弹塑性模型的强度折减法更明显一些,因此,建议采用理想弹塑性模型的强度折减法确定安全系数,而采用变模量弹塑性模型强度折减法确定变形。更多还原

【Abstract】 At present,only the strength parameters are reduced when the strength reduction method is used to analysis the slope stability,moreover the ideal elastic-plastic model is used in this analysis.This method isn’t considering fully the nonlinear of the soil before yield.The deformation calculated by using the strength reduction method based on the ideal elastic-plastic model is lower,and is not enough accurate for the field measurement.On the base of the Duncan-chang’s model,variable modulus elastic-plastic model strength reduction method which reduces the elastic modulus during elastic state is proposed in this paper,and more practical deformation field would be obtained.By comparing with the theoretical solution for strip foundation and the in-situ loading test results, the new method reasonability is proved.This new method is applied to calculate the deformation of slope engineering,and it is hoped to establish the relation between deformation and safety coefficient furthermore in order to make the field deformation monitoring more reasonable.But on the otherhand,it is more easy to get the safety coefficient based on the deformation mutation calculated by the ideal elastic-plastic model.We propose that use the ideal elastic-plastic model to determine the safety coefficient,and use the variable modulus elastic-plastic model to calculate the the deformation.更多还原