红层软岩表观预固结压力的测定

L. Lv, H. Liao, Li Song, Yingpeng Fu, Josephine Musanyufu
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引用次数: 1

摘要

视预固结压力是软岩的重要参数。本文对甘肃省定西地区的红层软岩进行了研究。为了获得软岩的表观预固结压力,首先重新设计了一种新的YS-1高压计,并将其用于阶梯加载约束压缩试验。由于软岩的压缩性较低,压缩曲线较为平坦。考虑到曲线曲率变化不明显,提出了数值映射方法。其次,引入了给定区域内孔隙率随垂向压力单调减小的实际边界条件;使用新定义的条件对现有的7种数学模型进行了比较。结果表明,Harris模型与压缩试验结果吻合较好。最后,利用所建立的方程计算了软岩的表观预固结压力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Determination of the red bed soft rock’s apparent preconsolidation pressure
Apparent preconsolidation pressure is an important parameter for soft rock. In this paper, investigated red bed soft rock was taken from Dingxi region, Gansu province, China. In order to obtain the apparent preconsolidation pressure of the soft rock, firstly, a new YS-1 high pressure oedometer was redesigned and used in the step loading confined compression experiments. Due to the soft rock’s low compressibility, the compressive curve was flat. Numerical mapping method was proposed considering curvature variation of the curve was not obvious. Secondly, the actual boundary condition which is the void ratio should monotonically decrease with the vertical pressure in the given domain was introduced. The existing 7 mathematical models were compared using the new defined conditions. The results showed that the Harris model was in good agreement with the compressive experimental results. Finally, the apparent preconsolidation pressure of the soft rock was calculated using the equations established in this research.
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