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中文摘要：
山区高速公路建设中,明洞顶回填应用广泛。通过大量的室内土工试验和理论分析,对水泥改良黄土的物理性质、应力—应变关系、强度特性、压缩特性及影响水泥改良黄土的力学特性的主要因素进行了研究。实验结果表明：水泥改良黄土的应力—应变关系曲线存在明显的应力峰值点,水泥改良土表现出明显的脆性破坏;最大干密度随水泥掺合比的增加变化不明显;压实度、掺合比以及龄期对水泥改良黄土的粘聚力均有影响;压缩模量与掺合比成正比,压缩系数随水泥掺合比的增加而降低。
英文摘要：
Open cut tunnel vault backfill has been widely applied to the construction of high speed railway in mountainous areas.This text,based on massive indoor soil tests and theoretical analysis,conducted research on the physical property,stress-strain relationship,strength characteristics,compression characteristics and the major factors that influence the mechanical properties of cement improved loess.Experimental results show that there exists obvious peak stress point in the stress-strain relationship curve of cement improved loess and there exists obvious brittle failure in cement improved loess.The change of maximum dry density is inconspicuous with the climbing of cement blending proportion.Cohesive force are influenced by degree of compaction,blending proportion and cycle.Modulus of compression is in direct proportion to blending proportion and coefficient of compressibility declines with the climbing of cement blending proportion.
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