黄河上游第三系泥质沉积物室内超高压试验研究

Study on the laboratory compression test of the Tertiary argillaceous sediments in the upstream of Yellow River under super-high pressure

通过室内超高压试验 ,再现了黄河上游第三系泥质沉积物成岩作用中的压密变化过程。论证其较好的工程特性是由于曾经遭受较大的压应力作用的结果 (包括自重应力和构造应力 )。这与青藏高原强烈的构造运动和地壳的差异隆升密不可分。对比现场试验与室内试验成果 ,证明用室内超高压试验获得的力学参数与物理指标的关系可以评价第三系泥质沉积物的力学参数 。

By the laboratory compression test under super high pressure, the evolution of the Tertiary argillaceous sediments in the upstream of Yellow River from soil to rock reappears. Due to the strong geological tectonics and distinct differential upwarping in the formation of Qinghai Tibet Platean, the Tertiary argillaceous sediments have good physical and mechanical properties. The laboratory compression test also proves that the argillaceous sediments studied in this paper had ever suffered high compressive pressures. The correlation between void ratio and pressure obtained from the laboratory compression test can be used to evaluate the mechanical parameters of the Tertiary argillaceous sediments, by contrast to the in situ deformation tests. Therefore, the laboratory compression test in this paper is very convenient and economic to be used to predict the mechanical parameters of the Neogene argillaceous sediments, especially where the in situ tests are difficult to carry out.