基于不同初始含水量的压实黄土力学特性试验研究  

Research on Mechanical Properties of Compaction Loess with Different Initial Water Content

作　　者：杨晶[1,2] 白晓红[1] 王林浩[1] 马富丽[1] 王敏[1] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024 [2]太原电力高等专科学校土木工程系,太原030013

出　　处：《太原理工大学学报》2012年第6期669-673,共5页Journal of Taiyuan University of Technology

基　　金：国家自然基金资助项目(51178287);山西省自然科学基金资助项目(2010011029)

摘　　要：用常规击实方法制备不同击实能下的压实黄土土样,比较三个不同击实能下的击实曲线,通过室内试验研究了随含水量和击实能的变化压实黄土强度的变化规律。试验结果表明:压缩系数随含水量增加而增大,随击实能变化表现为当含水量为某一击实能对应的最优含水量时,该击实能下的压实黄土压缩系数最小;剪切强度随含水量增加降低,随击实能的变化同样与相应击实能下的最优含水量密切相关。提出严格控制含水量是提高回填土地基和路基压实质量的重中之重,并指出采用压实度作为指标控制填土压实质量时必须注意击实能的影响,以确保压实度作为压实质量控制指标的合理性。The engineering mechanical property of compaction loess is an important basis for loess backfill foundation and road foundation engineering, because it is directly related to the compaction quality of loess. Compaction loess samples were prepared under different compaction energy by normal compaction methods, three compaction curves under different compaction ener- gy were compared. The intensity variation of compaction loess under different water content and compaction energy was researched by laboratory experiments. The test results show that the compression coefficient increased with the increase of water content, and the minimum compres- sion coefficient was obtained under a particular compaction energy when the water content was exactly the optimum water content corresponding to compaction energy. The shearing strength increased with the increase of water content and was closely related to the optimum water content under corresponding compaction energy. The strict control of water content was found to be the top priority to improve the compaction quality of loess backfill foundation and road foundation en gineering. With the degree of compaction as an indicator to control the quality of backfill loess, the effects of compaction energy should be noticed, so as to ensure the rationality of the degree of compaction as a compaction quality control indicator.

关 键 词：压实黄土 击实能 含水量 压缩系数 剪切强度 

分 类 号：TU416.1[建筑科学—岩土工程]