不同击实功对新疆非耕地固化戈壁土力学性能的影响

【目的】研究改变击实次数,获取不同击数下的击实功,结合无侧限抗压强度试验及抗压回弹模量试验分析不同击实功对新疆非耕地固化戈壁土力学性能的影响,为新疆日光温室固化戈壁土墙体填筑施工提供一定的数据支持和理论依据。【方法】依据《土工试验方法标准》GB 50123-1999、《公路工程无机结合料稳定材料实验规程》(JTG E51-2009)的测试要求,采用颗粒分析试验、击实试验测定土体的颗粒级配、类别和击实性能,研究戈壁土固化前的物理性能,进一步测定固化土不同龄期的抗压强度、抗压回弹模量试验。【结果】(1)随着击实功的增加,固化戈壁土最优含水率减小,最大干密度增大。(2)固化戈壁土试件的无侧限抗压强度在养护龄期7~60 d期间随击实功的增加而增加,当养护龄期到60~90 d时标准击实数及以上的击实功所得到的无侧限抗压强度变化不大。(3)固化戈壁土在同一养护龄期内随着击实功的增加抗压回弹模量增大,在同一击实功下,抗压回弹模量随着固化戈壁土养护龄期的增加呈增长趋势。【结论】25%的标准击实功的固化戈壁土在养护7 d龄期时的无侧限抗压强度为5.34MPa,满足日光温室墙体对强度(5.0MPa)的需求,可以节约施工成本和加快施工进度。

Effects of Different Compaction Work on Mechanical Properties of Non-arable Solidified Gobi Soil in Xinjiang

【Objective】 In this project, the compaction work under different number of compaction was obtained by changing the number of compaction times and the influence of different compaction work on mechanical properties of non-arable solidified Gobi soil in Xinjiang was studied with unconfined compressive strength test and compressive resilience modulus test. 【Method】Based on the test requirements of Standard for Soil Test Method (GB 50123-1999) and Material Test Methods of Materials Stabilized with Inorganic Highway Engineering (JTG E51-2009), the particle analysis test and compaction test were adopted to determine the soil grain composition, category and compaction performance. And the physical properties of Gobi soil before curing were studied and the compressive strength and compressive resilience modulus of cured soil at different ages were further measured. 【Result】(1)The results showed that with the increase of compaction work, the optimal moisture content of Gobi soil was reduced and the maximum dry density increased. (2) The unconfined compressive strength of the solidified Gobi soil specimen increased with the increase of the compaction work during the curing period of 7-60 d, when the curing age reached 60-90 d, the unconfined compressive strength obtained by standard compaction or above standard compaction had little change. (3) In the same curing age, the modulus of compressive resilience of solidified Gobi soil increased with the increase of compaction work. Under the same compaction work, the modulus of compressive resilience increased with the increase of curing age in the curing period of Gobi soil. 【Conclusions】The tests showed that the unconfined compressive strength of 25% standard compaction power for Gobi soil curing at 7 d age is 5.34MPa, which meets the demand for the strength (5.0MPa) of the solar greenhouse wall, thus saving the construction cost and speeding up the construction progress. The research provides some data support and theoretical basis for the construction of the solidified Gobi soil wall in Xinjiang.