水泥、土凝岩改良黏性土路用性能试验研究
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摘要
文章通过室内试验和理论分析,以轻质粉黏土为研究对象,进行了击实试验、无侧限抗压强度试验,以及冻融试验,研究了水泥和土凝岩两种改良剂对黏性土路用性能的影响。结果表明:改良黏性土无侧限抗压强度随水泥、土凝岩含量的增加而增加;且相同条件下土凝岩改良黏性土强度比水泥改良黏性土强度高;标准养护条件下,同等改良剂含量的改良土7d和14d的无侧限抗压强度呈明显上升趋势,28d后的无侧限抗压强度的增长趋势较为平缓;浸水条件下,则为7d到28d的无侧限抗压强度呈下降趋势,当养护龄期超过28d后,土凝岩改良土的无侧限抗压强度呈逐渐上升趋势;经冻融试验后的改良土试件,无侧限抗压强度明显降低。
Based on laboratory tests and theoretical analysis,the light weight silty clay is taken as the research object. Compaction tests,unconfined compressive strength tests and freeze-thaw were carried out to study the effect of two modifiers,cement and soil stabilizer,on the road performance of cohesive soil. The results show that: the unconfined compressive strength of modified cohesive soil increases with the increase of cement and soil stabilizer. At the same time,when the content of improver and curing period remain unchanged,the soil stabilizer improvement effect is better than cement; Under standard curing conditions,the same improver content of 7 d and14 d improved soil unconfined compressive strength was significantly increased,and after 28 d no increase in unconfined compressive strength is relatively smooth; Under soaking condition,the unconfined compressive strength of 7 d to 28 d showed a downward trend,when the curing period is over 28 d,unconfined compressive strength of soil stabilizer increased gradually; After frozen-thaw test soil thawing test,the compressive strength obviously decreased.
Based on laboratory tests and theoretical analysis,the light weight silty clay is taken as the research object. Compaction tests,unconfined compressive strength tests and freeze-thaw were carried out to study the effect of two modifiers,cement and soil stabilizer,on the road performance of cohesive soil. The results show that: the unconfined compressive strength of modified cohesive soil increases with the increase of cement and soil stabilizer. At the same time,when the content of improver and curing period remain unchanged,the soil stabilizer improvement effect is better than cement; Under standard curing conditions,the same improver content of 7 d and14 d improved soil unconfined compressive strength was significantly increased,and after 28 d no increase in unconfined compressive strength is relatively smooth; Under soaking condition,the unconfined compressive strength of 7 d to 28 d showed a downward trend,when the curing period is over 28 d,unconfined compressive strength of soil stabilizer increased gradually; After frozen-thaw test soil thawing test,the compressive strength obviously decreased.
引文
[1]王超,李增光.交通荷载作用下生物酶固化土路基动力特性数值模拟研究[J].公路工程,2014,39(1):54-55.
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[6]王保田,张福海,张文慧.改良膨胀土施工技术与改良土的性质研究[J].岩石力学与工程学报,2006,(S1):3157-3161.
[7]崔宏环,刘建坤,张立群等.寒区路基改良土冻融循环与荷载耦合作用下损伤力学研究[J].冰川冻土,2016,38(04):1183-1188.
[8] JANOO V C,FIRICANO A J,BARNA L A,et al. Field testing of stabilized soil[J]. Journal of Cold Regions Engineering,1999,13(1):37-53.
[9] SHIHATA S A,BAGHDADI Z A. Simplified method to assess freeze-thaw durability of soil cement[J]. Journal of Materials in Civil Engineering,2001,13(4):243-247.
[10] JTG E40—2007,公路土工试验规程[S]. JTG E40—2007,Test method of soil for highway engineering[S].
[2]朱辉,杜明芳,袁二键等.水泥石灰改良土在粉砂土路基处理中的应用[J].建筑技术,2014,45(07):608-611.
[3]王勇,李国芬,黄凯健等.水泥/石灰对滨海盐渍路基土性能的影响[J].南京林业大学学报(自然科学版),2014,38(05):165-169.
[4]刘福春.京沪高速铁路填料改良试验方法及效果[J].铁道技术监督,2001(3):27-31.
[5]向文俊,刘爱兰,吴育琦等.改良土二次掺灰工艺的石灰剂量检测方法[J].河海大学学报(自然科学版),2004,(03):313-315.
[6]王保田,张福海,张文慧.改良膨胀土施工技术与改良土的性质研究[J].岩石力学与工程学报,2006,(S1):3157-3161.
[7]崔宏环,刘建坤,张立群等.寒区路基改良土冻融循环与荷载耦合作用下损伤力学研究[J].冰川冻土,2016,38(04):1183-1188.
[8] JANOO V C,FIRICANO A J,BARNA L A,et al. Field testing of stabilized soil[J]. Journal of Cold Regions Engineering,1999,13(1):37-53.
[9] SHIHATA S A,BAGHDADI Z A. Simplified method to assess freeze-thaw durability of soil cement[J]. Journal of Materials in Civil Engineering,2001,13(4):243-247.
[10] JTG E40—2007,公路土工试验规程[S]. JTG E40—2007,Test method of soil for highway engineering[S].