碱矿渣粉固化沙漠土力学性能及耐久性能研究
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摘要
结合新疆古尔班通古特沙漠环境特性,通过固化沙漠土击实试验、干湿循环试验以及冻融循环试验,研究其力学性能和耐久性能。结果表明:固化沙漠土最优碱矿渣粉固化剂掺量为14%,最优含水率为10%,此时最大密度为2.09 g/cm~3,28 d抗压强度为6.34 MPa。固化沙漠土28 d无侧限抗压强度随干湿循环次数的增多而增大,干湿循环9次时强度最大(8.67 MPa),比标准试样减小27.9%,之后无侧限抗压强度逐渐降低。固化沙漠土无侧限抗压强度随冻融循环次数的增加而增大,当冻融循环5次后增幅趋于平缓,冻融循环7次后强度随龄期的增大逐渐减小,9次冻融循环后的强度为7.8 MPa(标准养护试样的80.4%)。
Based on the environmental characteristics of Gurbantunggut Desert in Xinjiang, the mechanical properties and durability of desert soil compaction test, dry and wet cycle test and freeze-thaw cycle test were studied. The results show that the curing agent of the optimal alkali slag powder in solidified desert soil is 14%, and the optimum water content is 10%, at which time the maximum density is 2.09 g/cm~3 and 28 d compressive strength is 6.34 MPa. The compressive strength of 28 d without lateral limit of cured desert soil increases with the increase of the number of dry and wet cycles, and when the number of dry and wet cycles reaches 9 times, the compressive strength of the non-lateral limit decreases gradually, at this time the maximum strength is 8.67 MPa, which is 27.9% lower than that of the standard specimen. The compressive strength of the solidified desert soil increases with the increase of the number of freeze-thaw cycles, and when the freeze-thaw cycle is 5 times, the increase tends to be flat, and when the number of freeze-thaw cycles reaches 7 times, the intensity decreases gradually with the increase of age, and the strength after 9 times freeze-thaw cycles is 7.8 MPa, which is 80.4% of the standard specimen.
Based on the environmental characteristics of Gurbantunggut Desert in Xinjiang, the mechanical properties and durability of desert soil compaction test, dry and wet cycle test and freeze-thaw cycle test were studied. The results show that the curing agent of the optimal alkali slag powder in solidified desert soil is 14%, and the optimum water content is 10%, at which time the maximum density is 2.09 g/cm~3 and 28 d compressive strength is 6.34 MPa. The compressive strength of 28 d without lateral limit of cured desert soil increases with the increase of the number of dry and wet cycles, and when the number of dry and wet cycles reaches 9 times, the compressive strength of the non-lateral limit decreases gradually, at this time the maximum strength is 8.67 MPa, which is 27.9% lower than that of the standard specimen. The compressive strength of the solidified desert soil increases with the increase of the number of freeze-thaw cycles, and when the freeze-thaw cycle is 5 times, the increase tends to be flat, and when the number of freeze-thaw cycles reaches 7 times, the intensity decreases gradually with the increase of age, and the strength after 9 times freeze-thaw cycles is 7.8 MPa, which is 80.4% of the standard specimen.
引文
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[4] PHILIPPE Claudin,BRURO Ardreotti.A Scaling Law for Aeolian Dunes on Mars,Venus,Earth,and for Subaqueous Ripples[J].Earth and Planetary Science Letters,2006,25(2):30-44.
[5] 梁止水,吴智仁,杨才千,等.基于W-OH的砒砂岩抗蚀促生机理研究[J].水利学报,2016,47(9):1160-1166.
[6] SIVAPULLAIAH P V,LAKSHMI K H,MADHU K K.Geotechnical Properties of Stabilized Indian Red Earth[J].Geotechnical and Geological Engineering,2003,21:399-413.
[7] 李驰,于浩.固化风沙土强度特性及固化机制试验研究[J].岩土力学,2009,30(增刊2):48-53.
[8] 鲍恩财,邹志荣,张勇.日光温室墙体用相变固化土性能测试及固化机理[J].农业工程学报,2017,33(16):203-210.
[9] 白二雷,许金余,李浩,等.碱激发剂对矿渣粉煤灰活性激发特性影响试验研究[J].科学技术与工程,2014,14(1):96-99.
[10] 何晶.碱矿渣粉固化剂及其沙漠土的固化特性研究[D].乌鲁木齐:新疆农业大学,2017:10-22.
[11] 何晶,何建新.利用碱激发矿渣粉制备的土体固化剂的力学性能研究[J].新疆农业大学学报,2016,39(5):414-418.
[12] 水利部.土工试验规程:SL 237—1999[S].北京:中国水利水电出版社,1999:97-104.
[13] 水利部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009:1-13.
[14] 彭浩.基于骨料级配优化的混凝土配合比设计方法研究[D].北京:北京建筑大学,2014:9-35.
[15] 李从娟,雷加强,徐新文,等.古尔班通古特沙漠土壤水分与化学性质的空间分布[J].生态学报,2014,34(15):4380-4389.