静力压实不同含水率红砂岩粗粒土能耗规律试验研究

Experimental study of energy evolution ofcoarse-grained red sandstone soil under static loading conditions

为研究静力压实不同含水率红砂岩粗粒土能量消耗规律,利用自制装置在电子万能试验机上进行静力压实试验,得到6种不同含水率红砂岩粗粒土静力压实试验的压力-位移关系,分析含水率和压实能量对红砂岩粗粒土压实特性的影响.结果表明:在相同的压实能量作用下,当含水率为8.3%时,土体产生的压实位移最大;土体干密度随单位体积静压功增大而增加,两者符合对数关系;土体静力压实的实质是挤出土中气体,而不是挤出土中水分;含水率偏大将对土体的压实产生不利影响.

To study energy evolution of coarse-grained red sandstone soil under static loading conditions, static load compaction tests were conducted by using an electronic universal testing machine. Stress-displacement relations of coarse-grained red sandstone soil were obtained and the effects of moisture content and compaction energy on compaction property were analyzed. The results show that under the same compaction energy, when the moisture content is 8.3 %, the soil gets largest displacement; the relationship between unit-volume static compaction work and dry density can be described as logarithm relation; the essence of static compaction of soil is extruding soil gas, not squeezing out the moisture from the soil; the general moisture content has an adverse effect on the compaction of soil.