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中文摘要：
针对常规计算方法未能考虑老填埋场侧向变形对中间衬垫系统应变的影响这一问题，提出了模拟老填埋场总沉降和侧向变形的数值分析方法，即通过选取简化的垃圾本构模型，使得老填埋场的最大总沉降与传统一维沉降计算结果相同，从而得到老填埋场侧向变形的分布，结合某山谷型填埋场扩建工程进行了分析，计算结果表明，采用摩尔一库仑模型和邓肯一张模型均可较好地模拟老填埋场的总沉降；老填埋场侧向变形对中间衬垫系统应变的影响较大，常规计算方法将明显低估其实际值。
英文摘要：
The existing method ignored the lateral movements of old landfill in calculating the tensile strain of intermediate liner system. A numerical analysis method was presented to simulate the total settlements and lateral movements of old landfill in order to solve the problem. Simplified constitutive models were chosen for the waste so that the maximum settlement of old landfill was equal to that calculated by the conventional one-dimensional settlement analysis. Then the lateral deformations of old landfill can be determined. A vertical expansion landfill case was analyzed. Results show that the simplified constitutive models for the waste such as Mohr-Coulomb （M-C） model or Duncan-Chang （D-C） model can effectively simulate the total settlements of old landfill. The lateral movements of old landfill can heavily influence the tensile strains of intermediate liner system and the existing method may obviously underestimate the actual values.
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