Experimental Study on Mechanical Properties of Oily Sludge Residue-Lime Modified Loess
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摘要: 含油污泥是油田开采、石油炼制以及运输、使用等过程中产生的一种工业废弃物。全球范围内每年的含油污泥产量数目惊人,若不加以妥善处理,会产生巨大的存放成本,并造成严重的环境污染问题。以热解后的含油污泥残渣为原料,将残渣、石灰掺入黄土中,用于填方工程,以实现残渣资源化利用,并研究了最优配合比下不同压实度、含水率、固结围压对掺含油污泥残渣-石灰的黄土的力学特性的影响。结果表明,压实度、含水率和固结围压均会对应力-应变曲线产生较大影响,高压实度、低含水率和低固结围压条件下,大多为应变软化型曲线;随着含水率、固结围压的增大,压实度降低,应力-应变曲线由软化型逐步向硬化型过渡;压实度越大、含水率越低,黏聚力和内摩擦角均越高;低围压、低含水率下土体呈剪切滑移破坏,其余条件下呈侧胀破坏。该研究结果可对含油污泥残渣处理及工程应用提供理论与试验支持。Abstract: Oily sludge is an industrial waste generated from oil field exploitation, petroleum refining, transportation, and usage. Every year, a great amount of oily sludge is produced worldwide, which will bring huge storage cost and cause serious environmental pollution problems if not properly treated. In this article, we carried out a trial study to mix the oily sludge after pyrolysis and lime with loess, and applied it to filling engineering to utilize the residue. The effects of different compactness, water content, and consolidation confining pressure on the mechanical properties of oily sludge-lime loess under the optimal mix ratio were studied. The research results showed that compaction degree, water content, and confining pressure all had a great influence on the stress-strain curve. Under the conditions of high compaction, low water content, and low confining pressure, most of the stress-strain curves were strain softening curves. With the increase of water content and confining pressure, the degree of compaction decreased, and the stress-strain curve gradually transitions from softening type to hardening type. And with the increase of compaction degree and decrease of the water content, both the cohesion and internal friction angle increased. The soil showed shear slip failure under low confining pressure and low water content, and lateral expansion failure under other conditions. The research results can provide theoretical and experimental support for the treatment and engineering application of oily sludge residue.
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Key words:
- oily sludge residue /
- loess /
- mechanical properties /
- stress-strain relationship /
- strength
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