土工膜防渗层稳定性的离心模型试验研究和极限分析

本文用土工离心模型试验方法对均质坝上游土工膜防渗层的稳定性状作了较为系统的研究，探讨了土工膜类型、上游坡比和压实粘土层的厚度三种因素对这类土工膜防渗体稳定性的影响规律。在此基础上用极限平衡法推导了土工膜防渗层安全系数计算公式，用它求得的安全系数真实反映了土工膜防渗层模型的安全性。离心模型试验结果和建立的稳定分析公式为用压实土层代替碎石垫层铺设土工膜防渗层提供了先例和设计计算方法，可大大节省工程费用。

Centrifuge modeling and limit equilibrium analysis of the stability of an innovated geomembranes anti-seepage system

A comprehensive study has been done of the stability of geomembranes anti seepage system by both centrifugal model testing and limit equilibrium analysis. The innovation of the anti seepage system is in that the conventional stone cushion overlying on the geomembranes is tried to be substituted by a layer of compacted fill. The factor experiment method is used in the model tests to determine the influence of types of geomembranes, angle of upstream slope, and thickness of ovevlying cushion of compacted fill. Moreover, equations of the factor of safety of geomembranes anti seepage system are given for the most critical conditions and justified by the results of model tests. The successful practical example is also presented in the paper to encourage such substitution in the light of local conditions in the application of geomembranes in practical engineering.