以下为句子列表：
英文: Based on the lab orthogonal tests, using self-manufactured constant head permeameter, the effect of gravel content, void ratio and particle shape on the coefficient of permeability of soil-rock-mixture was studied.
中文: 本文采用室内正交实验，利用自制的常水头渗透仪，研究了砾石含量、孔隙比和颗粒形状3个因素在不同水平下对土石混合体渗透系数的影响。
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