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Reasonable Design Method for Reinforced Slope Cutting

加筋边坡切削的合理设计方法

基本信息

批准号：
01550388
负责人：
MATSUI Tamotsu
金额：
$ 1.34万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01550388/
关键词：
Failure Finite Element Method Limit Equilibrium Method Reinforcement Slip Surface Slope Stability 切土斜面設計法

项目摘要

Reinforcement mechanism and stability characteristics of reinforced slope cutting were studied both experimentally and analytically to establish a reasonable design method for reinforced slope cutting.A hybrid slope stability design method for reinforced slope cutting was proposed. The proposed method is a kind of hybrid method of the finite element method and limit equilibrium method, in which the potential failure slip surface of a slope is defined as the failure shear strain zone, according to strain failure criterion, being developed from the toe to the top of the slope tracing by shear strength reduction technique, and the safety factor of the slope is defined as the invert of the average stress level, according to stress failure criterion. Analytical results showed that the safety factor and the failure pattern obtained from the proposed hybrid method were quite close to those from the Bishop's method.In order to verify the hybrid method for reinforced cut slope stability analysis, two full scale field tests on reinforced cut slopes in residual soil were performed. The predicted behavior of the reinforced slope cutting by the hybrid method agreed with the field test data and site observation. Based on the analytical results and field measurements, a modified Fellenius' method for reinforced slope was also proposed. Agreement between the hybrid method and the modified Fellenius' was found to be satisfactory. Consequently, applicability of the hybrid method to the practical in-situ reinforcement slope stabilization was demonstrated in success. Also, the modified Fellenius' method can be applied as a simplified method.

通过试验和分析研究了加筋土路堑的加固机理和稳定性特征，建立了合理的加筋土路堑设计方法。提出了加筋土路堑的混合边坡稳定性设计方法。该方法是有限元方法和极限平衡法的一种混合方法，将边坡潜在的破坏滑动面定义为破坏剪应变区，根据应变破坏准则，采用抗剪强度折减技术从坡脚向坡顶发展，根据应力破坏准则，将边坡安全系数定义为平均应力水平的倒数。分析结果表明，该混合方法得到的安全系数和破坏模式与Bishop法的结果非常接近。为了验证该混合方法在加筋路堑边坡稳定性分析中的有效性，进行了两个残留土中加筋路堑边坡的足尺现场试验。混合法预测的加筋土路切性状与现场试验数据和现场观测结果吻合较好。在分析结果和现场实测的基础上，提出了一种修正的Fellenius加筋土法。混合方法与改进的Fellenius方法之间的一致性是令人满意的。从而验证了该混合方法在现场加固边坡加固工程中的适用性。此外，改进的费勒尼乌斯方法也可以作为一种简化方法应用。