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基于大量室内试验结果,系统分析高原湖相泥炭土一维固结特性,探讨取样深度、固结压力p、加荷比R、加荷方式和预压荷载等因素对固结系数Cv的影响及机制。试验结果表明:泥炭土重塑和原状样Cv均满足随p增大而迅速减小之后趋于稳定的规律,和普通黏性土差异较大;经过预压的泥炭土,当预压荷载≤100 k Pa时,其Cv-p关系和未预压样基本一致;预压荷载>100 k Pa时,Cv较未预压样大幅度减小,并且随着p的增大,Cv变化不大;当固结压力p>200 k Pa后,所有经过预压土样和未预压样的Cv值大小相近。分析表明:原状样结构性不显著是造成泥炭土固结特性的主要原因;固结压力作用下,泥炭土经历了从多孔隙状态至相对密实状态的转变。
Based on the results of a large number of indoor experiments, the one-dimensional consolidation characteristics of plateau lacustrine peat soils were systematically analyzed and the effects of sampling depth, consolidation pressure p, loading ratio R, loading mode and preloading pressure on consolidation coefficient Cv mechanism. The results show that both the remolded peat soil and the original sample Cv meet the law that tends to be stable after decreasing rapidly with the increase of p, which is quite different from ordinary cohesive soil. When the preloading pressure is less than or equal to At 100 kPa, the Cv-p relationship is basically the same as that of the un-pre-pressed sample. When the preloading pressure is higher than 100 kPa, the Cv decreases greatly compared with the un-pre-pressed sample, and with the increase of p, ; When the consolidation pressure p> 200 k Pa, all pre-pressed soil samples and non-pre-pressed samples of similar size Cv. The analysis shows that the structural property of the original sample is not significant, which is the main reason for the consolidation of peat soil. Under consolidation pressure, the peat soil undergoes the transition from porous to relatively dense state.