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黄土湿陷变形使得工程造价变高,且工程事故引起的损失增大,湿陷性仍是值得研究和探索的问题。湿陷变形量的计算目前常用的方法有原位浸水试验和规范建议的湿陷系数法。原位浸水测试结果准确但成本高、耗时长,湿陷系数法更为常用,但计算结果和实际值差异很大,为此需对湿陷系数的影响因素进行研究。文章旨在探索湿陷系数与初始含水率和上覆压力的关系,在甘肃兰州和平镇取样进行基本物理力学性质的测试,取环刀样烘干后配置不同含水率的固结试验,双线法获得不同初始含水率和压力下的湿陷系数,分析其关系。结果表明:相同初始含水率下,湿陷系数随着压力的增大先快速增大后基本保持不变;相同压力下,初始含水率越高,湿陷系数越小。湿陷系数与初始含水率和上覆压力的关系可在三维空间中湿陷面表示,根据试验结果文章建立了该湿陷面的数学表达式。
The deformation of loess collapses makes the project cost high, and the loss caused by engineering accidents increases. Collapsibility is still worth to be studied and explored. Calculation of deformation of collapsible Currently commonly used methods are in situ immersion test and the proposed method of collapse coefficient method. In situ immersion test results are accurate but costly, time-consuming, collapsible coefficient method is more commonly used, but the calculated results and the actual value is very different, for which factors affecting the collapse coefficient needs to be studied. The purpose of this paper is to explore the relationship between collapsibility coefficient and initial moisture content and overburden pressure, and to test the basic physical and mechanical properties at Heping Town, Lanzhou City, Gansu Province. Law obtained under different initial moisture content and pressure collapse coefficient, analysis of the relationship. The results show that under the same initial moisture content, the collapsibility coefficient first increases rapidly with the increase of pressure and remains basically unchanged. Under the same pressure, the higher the initial water content, the smaller the collapsibility coefficient. The relationship between collapsible coefficient, initial moisture content and overburden pressure can be expressed in three-dimensional space. According to the experimental results, the mathematical expression of the collapsed surface is established.