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不同固化剂改良淤泥土的试验研究

2020-08-03夏艳波任睆遐何振华邓新宇张艺馨

价值工程 2020年21期

夏艳波 任睆遐 何振华 邓新宇 张艺馨

摘要:为了探究不同土壤固化剂对淤泥土的改良效果,开展了一系列室内土工试验,探究多种固化剂改良淤泥土的液塑限以及无侧限抗压强度。研究结果表明:水泥、石灰、细砂土以及生物酶均可降低淤泥质土的含水率、液限及塑性指数,并都使固化淤泥质土的无侧限抗压强度增加;通过比较分析发现,细砂土改良淤泥质土的含水率下降最明显;水泥与生物酶固化淤泥质土的无侧限抗压强度最明显,增幅分别是687.1%和903.9%,而石灰与细砂土的固化效果不显著,无侧限抗压强度增幅只有272.7%和309.5%。

Abstract: In order to explore the effect of different soil hardeners on the improvement of silt, a series of laboratory geotechnical tests were carried out to explore the liquid plastic limit and unconfined compressive strength of various soil hardeners. The results show that: cement, lime, fine sand and biological enzyme can reduce the water content, liquid limit and plasticity index of silt soil, and increase the unconfined compressive strength of solidified silt soil; through comparative analysis, it is found that the water content of improved silt soil with fine sand decreases most obviously; the unconfined compressive strength of cement and biological enzyme solidified silt soil increases most obviously, it is 687.1% and 903.9% respectively, but the curing effect of lime and fine sand is not significant, and the increase of unconfined compressive strength is only 272.7% and 309.5%.

关键词: 固化剂;淤泥质土;无侧限抗压强度

Key words: curing agent;muddy soil;unconfined compressive strength

中圖分类号:TU43                                      文献标识码:A                                  文章编号:1006-4311(2020)21-0217-02

0  引言

我国幅员辽阔,土地资源种类繁多,但是在工程建设中遇到的不良土质也比较多。随着经济高速发展,基础工程建设速度提高,在海滨、湖泊、中小型河流处的工程建设中所产生的淤泥质废弃软土的处理问题也越来越值得我们重视。在工程实际中,往往会产生大量的废弃淤泥质土。因为淤泥质土一般具有含水率较大、有机质含量高、强度低等特点,难以直接应用在工程中。如果不能加以利用,则会造成一定的环境污染以及资源浪费。倘若能对其进行改良固化,用作路基材料,可以使淤泥成为一种再生资源[1-2],实现生态友好型工程。对于淤泥土已经有一些学者开展了许多研究,如徐杨等[3]采用水泥、石灰无机固化材料对淤泥进行……

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