共查询到18条相似文献，搜索用时 156 毫秒
1.
粉土及其稳定土的三轴试验研究 总被引：9，自引：1，他引：8
以粉土和4 %石灰、2 %水泥+2 %石灰、4 %SEU-2型固化剂、8 %SEU-2型固化剂处理的粉土为研究对象,通过不固结不排水三轴剪切试验(UU)和固结不排水三轴剪切试验(CU)对变掺量、变龄期条件下粉土及稳定土的强度和变形特性进行了研究。试验结果表明：粉土及其稳定土的应力-应变曲线主要为软化型。SEU-2型固化剂在改善粉土的凝聚力方面起了很好的作用,综合考虑了不同稳定方法的强度指标,表明掺SEU-2型固化剂是稳定粉土的最有效的方法。 相似文献
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GT型土壤固化剂改良土的工程特性研究 总被引：18，自引：3，他引：15
GT型土壤固化剂是一种新型的土壤改性加固材料,以高钙灰和脱硫石膏两种工业废料为主要原料,辅以生石灰、水泥、熟石膏、硫酸铝及明矾石等次要成分,采用生石灰消解法除去脱硫石膏中的自由水,按全粉料配料的方法研制而成。按一定掺量向土中掺入石灰和GT型土壤固化剂制成石灰改良土样和固化剂改良土样并进行养护、浸水,对土样进行击实试验、直剪试验、压缩试验和渗透试验。试验结果表明固化剂改良土的击实效果、抗剪强度、压缩性、抗渗透性等工程特性明显优于石灰改良土。分析了GT型土壤固化剂加固土的机理,为进一步的研究和工程应用提供参考。 相似文献
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BS-100型土壤固化剂在季冻区的路用性能试验研究 总被引：9，自引：0，他引：9
采用美国Base-Seal固化剂（BS-100型）,对长春地区典型黏性土进行了固化处理,同时对其加固土的路用性能进行了系统地试验研究。首先,进行了Base-Seal固化剂加固土的最佳配合比筛选试验,在此基础上进行了最佳配合比条件下加固土的无侧限抗压强度、间接抗拉强度、室内回弹模量、冻稳定性、水稳定性和渗透性等路用性能指标方面的试验研究,得出Base-Seal固化剂加固土作为路面基层材料具有早期强度和回弹模量高、抗弯拉性能、冻稳定性能、水稳定性能和抗渗性能好的结论,适合在长春地区及其气候、土质相似地区的道路工程中应用。 相似文献
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工业废渣加固土强度特性 总被引：3，自引：0，他引：3
工业废渣的资源化是解决工业废渣环境污染的有效途径之一。以粉煤灰和高炉矿渣为固化剂,石灰为碱性激发剂,对黏土进行加固。通过室内试验的方法,分析固化剂掺入量、养护龄期等对固化土无侧限抗压强度、pH值和饱和度等发展规律的影响。试验结果表明,固化土的无侧限抗压强度随固化剂掺入量的增加而增大,随养护龄期的增加而增大,提出一个综合反映固化剂掺入量、养护龄期和压实度等因素对固化土强度影响规律的综合影响因子,固化土强度与综合影响因子呈负指数函数关系;粉煤灰+石灰和高炉矿渣+石灰可有效改良土体无侧限抗压强度特性;石灰是一种有效的碱性激发剂,可提供工业废渣发生火山灰反应的高碱性环境。试验成果为工业废渣改良不良土质的设计提供试验依据。 相似文献
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为了解决宁波地区电镀场地重金属污染问题,研究利用自配固化剂开展铬污染土的毒性浸出试验、无侧限抗压强度试验、动荷载作用下的长期稳定性试验以及扫描电镜试验。在此基础上分析固化土的力学特性、浸出特性等随养护龄期、固化剂掺量、固化剂配比、铬污染水平的变化规律。结果表明：自配固化剂对铬污染土的固化率均达85%以上,固化率大体上随... 相似文献
6.
为探究纳米SiO2和石灰对黄泛区粉土的改良效果,通过击实试验、无侧限抗压强度试验、扫描电镜试验和XRF试验等系列试验,研究纳米SiO2和石灰掺量对黄泛区粉土压实性、抗压强度、水稳性等力学特性的影响,分析改良粉土的微观结构及固化机理。结果表明:纳米SiO2改良土的最大干密度和最优含水率随纳米SiO2掺量的增加而提高,纳米SiO2改良土中掺加石灰会降低最大干密度,但会提高最优含水率;纳米SiO2与石灰联合使用改良效果优于单独掺入纳米SiO2,1.5%纳米SiO2-2%石灰改良土的无侧限抗压强度、黏聚力和内摩擦角提升最为显著;与素土和纳米SiO2改良土相比,纳米SiO2-石灰改良土的水稳性得到显著改善;在纳米SiO2改良土中,纳米SiO2主要起到填充土颗粒之间孔隙的作用,纳米SiO2与石灰联合使用可在土中形成胶结物质、发挥黏结与填充作用、大幅提高土的强度。 相似文献
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我国城市污泥产量巨大,如果得不到妥善处理将会严重影响环境综合治理。为了研究一种高效、资源、稳定的城市污泥处理技术,对城市污泥先进行生石灰消化处理,再通过正交试验,以无侧限抗压强度为指标,优选出生石灰、原料土、城市污泥、固化剂等的最佳配比,配制成一种新型城市污泥固化土,并对其力学特性进行试验研究。试验结果表明：研制的新型城市污泥固化剂固化处理城市污泥效果很好,重金属浸出量满足国家规范要求,污泥固化土强度随着养护龄期的增加而增大,且28 d后慢慢趋于相对稳定,碱性对强度有促进作用,建议固化土初始配制含水率最高控制在45%～50%之间。三轴剪切试验得到的应力峰值和结构屈服应力随着围压和养护龄期的增大而增大,环剪试验得到的残余强度与养护龄期及有效法向应力成正比,与剪切位移成反比。 相似文献
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为解决淤泥固化及其资源化利用的问题,以宁波地区淤泥为研究对象,利用水玻璃基淤泥固化剂制备固化土,通过室内试验、固化机理分析和现场试验研究固化土的力学性质。室内试验给出了无侧限抗压强度和压缩模量随固化剂掺入比改变的规律,并指出存在最佳掺入比为7%;固化机理分析表明随着固化剂掺入比增加,固化土颗粒由鳞片状或条块状向团块状变化,团块体积呈增大趋势,固化土孔隙率小幅增大,中值孔径亦小幅增大,固化土由黏性土向粉土化转变;现场试验取心土样无侧限抗压强度约为室内试验值的70%。结果表明,水玻璃基淤泥固化剂加固淤泥土方案切实可行。 相似文献
10.
滨海盐渍土的固化方法及固化土的偏应力-应变 总被引：2，自引：0，他引：2
滨海盐渍土可使用水泥、石灰、粉煤灰和高分子材料SH固土剂单独及联合固化,以提高土的强度、抗变形能力和水稳性。为研究各种固化方法固化盐渍土的抗变形能力和偏应力-应变特征,通过三轴UU压缩试验得到盐渍土和6种固化盐渍土的偏应力-应变曲线。曲线显示：水泥＋石灰类固化土呈应变软化型、石灰＋粉煤灰类固化土呈应变软化型、石灰类固化土呈应变硬化型。掺入SH固土剂,提高了固化土的浸水前后的强度,同时也增强了固化土的水稳性。掺入SH固土剂使固化土达到偏应力峰值所需的应变增加,即抗变形能力增强;0.9%SH固土剂+12%石灰+36%粉煤灰固化土具有适中的强度、良好的弹性变形和水稳性的优点,作为轻质路堤填料使用,还可减少滨海地区软土路基的沉降量,这使其成为滨海盐渍土的6种固化方案中的最适宜方案。 相似文献
11.
Silt cannot satisfy the requirements of highway construction because of its low strength. A new stabilizing agent (SEU-2) was developed to improve the mechanical performance and applicability of silt in road. Laboratory tests, including unconfined compression and shrinkage tests, were performed. Test results show that the new stabilizing agent can significantly increase the strength and the water stability, and decrease the shrinkage strain of silt. Field tests were also carried out and the results indicated that the new stabilizing agent could effectively improve the entire stiffness of subgrade. From the point of view in mechanics and applicability in road, adding 4% new stabilizing agent is an economic and reasonable method to stabilize the silt. The stabilized silt has high early strength, small shrinkage deformation, and high entire stiffness. It can satisfy the requirements of highway subgrades. 相似文献
12.
改性石灰粘土固化剂的研究 总被引：3，自引：0，他引：3
通过运用正交试验和XRD等方法,研究了改性石灰粘土固化剂的最佳配比及各种外加剂的增强机理,试验表明：对于最佳含水量的土壤,改性石灰粘土固化剂的最佳配比为：生石灰84％,石膏3％,硫酸钠5％,硫酸铝8％。用它固化的土壤州抗压强度比同一条件下用生石灰固化的土壤提高56．9％。外加剂的作用机理在于使稳定土早期形成较多的钙矾石。 相似文献
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Greeshma Nizy Eujine Sreedharan Chandrakaran Natesan Sankar 《Arabian Journal of Geosciences》2017,10(20):454
Atterberg Limit Tests, unconfined compressive strength tests, and California Bearing Ratio Tests were conducted on the two minerals—kaolinite and bentonite—after subjecting them to stabilization with lime, enzyme, and enzymatic lime. The purpose of the study was to evaluate the effectiveness of enzymatic lime as a stabilizer over lime and enzyme. Results establish that enzymatic lime stabilization is the better stabilizer in terms of strength development. The unconfined compressive strength and California Bearing Ratio values of enzymatic lime stabilized samples have increased up to 5 and 30 times in the case of kaolinite mineral, but to only less than 1.5 times in the case of bentonite mineral. The study thus indicates that enzymatic lime stabilization is predominantly effective for clays containing kaolinite minerals. 相似文献
15.
Pozzolanic fly ash as a hydraulic barrier in land fills 总被引：2，自引：0，他引：2
The liner plays an important role in controlling migration of contaminants present in the leachate in waste containment systems such as land fills and impoundments. Although questions have been raised about the performance of clay liners, they are increasingly used singly or as double liners in disposal sites. Though the clay liners possess many advantages such as low permeability and large attenuative capacity, they also possess high shrinkage potential and hence can crack under unsaturated conditions causing instability and increase in leakage rates. Further, the permeability of the clay linear can increase due to clay–pollutant interaction. This study examines the potential of pozzolanic fly ash as a hydraulic barrier in land fill. The behaviour of three different types of fly ashes, showing a range of physical properties and chemical composition from three different sources are reported in the study. Geotechnical properties, needed to evaluate the use of fly ashes as barriers, such as shrinkage, compaction, permeability, consolidation and strength characteristics are reported. The results show that fly ashes possess low shrinkage and hence do not crack. Compacted fly ashes undergo very little volume changes. They also show that pozzolanic fly ashes develop good strength properties with time. Pozzolanic fly ashes containing sufficient lime develop strength even without addition of lime. Non-pozzolanic fly ashes do not develop strength even on addition of lime. Fly ashes generally consist of silt size particles and consequently possess high permeability. However, pozzolanic fly ashes with lime exhibit low permeability on curing because of the formation of gelatinous compounds which block the pores. Thus, pozzolanic fly ashes appear to be promising for construction of liners to contain alkaline leachate. 相似文献
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淤泥富含大量有机质,受微生物作用,有机质会逐步分解出腐殖酸;同时,腐殖酸又会影响有机质降解,进而影响淤泥固化效果。为此,通过维持恒定的碱性缓冲溶液环境（pH=9.0）,将淤泥浸泡其中,观测其有机质含量的变化过程。结果表明,碱性缓冲溶液既能加快有机质分解,也能消耗腐殖酸,使溶液保持为碱性状态;当有机质分解完成,腐殖酸也释放结束,降解过程大约持续28 d。通过掺入水泥和石灰固化淤泥,发现含有机质的固化淤泥,其强度随养护时间会先增长后衰减,但预降解有机质的固化淤泥强度不会衰减。由此说明,通过碱性缓冲溶液预降解淤泥有机质,可以提升固化土耐久性。 相似文献
17.
Industrial waste generation has reached up to millions of tons yearly. One way to solve the problems of the large accumulating amount of waste could be to incorporate it into the soil; thus, finding a way for the use of industrial waste could be a quest for soil improvement studies. Industrial sludge in certain pozzolanic form reacts with soil and possesses cementitious properties. This paper illustrates the utilization of lime, steel and copper sludge in improvement of high plasticity clayey soil. The influence of stabilizer type, different curing times and various ratios of lime to sludge are evaluated by Atterberg limits, standard proctor compaction, unconfined compressive strength and unconsolidated undrained strength in triaxial test. The test results show that adding lime and sludge results in an increase in maximum strength. Moreover, the strength of soil increases with the increase of curing time. Utilizing stabilizers also influences plasticity index and compaction parameters. Finally, the results demonstrate that steel sludge has better performance than that of copper sludge in term of strength development. 相似文献
18.
石灰改良红层无侧限抗压强度试验研究 总被引：3，自引：1，他引：2
红层是一种特殊岩土,作为路基材料时,常会导致不均匀沉陷、翻浆冒泥等病害。为改善其力学性质,工程上通常掺入一定剂量的石灰（Ca（OH）2）进行改良。由于降水-蒸发的周期性变化,运营期间反复干湿循环作用对路基土的工程性质造成较大影响。基于此,结合室内无侧限抗压强度试验,研究了干湿循环作用对不同掺量的石灰改良红层无侧限抗压强度的影响。结果表明：在最佳含水率下,石灰改良红层的无侧限抗压强度随石灰掺量的增加而增大;干湿循环作用对改良红层无侧限抗压强度的影响与石灰掺量有关,石灰掺量较低时,改良红层的抗压强度随干湿循环次数的增加而减小,石灰掺量较高时,改良红层的无侧限抗压强度随干湿循环次数的增加而显著增大;未改良红层塑性较大,试样均为塑性鼓胀破坏,掺入石灰后,红层强度增大,脆性增强,呈脆性剪切破坏,经历干湿循环作用后,石灰改良红层试样呈多缝锥形破坏。 相似文献