Effect of intergranular friction on soft-sedimrnt deformation

粒间摩擦对软沉积物变形的影响

• 批准号: 16540418
• 负责人: MIYATA Yuichiro
• 金额: $ 1.98万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540418/
• 关键词: soft-sediments; failure style; intergranular friction; singing sand; grain surface; 安息角; スティックスリップ; ストレスチェーン; 歪の局所化; soft-sediments; failure style; intergranular friction; singing sand; grain surface; 安息角; スティックスリップ; ストレスチェーン; 歪の局所化

This study focused on the intergranular friction as a major factor contralling the deformation style of soft-sediments. In order to verify this problem, material with different intergranular friction but with the same physical properties other than the friction is needed. The singing sand is one of such material, because they show higher friction than usual sands, and had been changed due to long-term polish under water. In the same way, we can change the friction property of sands in laboratory. Various kinds of physical properties were examined, such as porosity, angle of repose of sand slope, angle of shear resistance, and vane-shear strength for variously posished sands both in air and in water. The deformatin styles were also examined under shear both in air and in water, including the condition of sound producing. As the results ;(1)The intergranular friction becomes higher in enough polished sands for singing, probably because of intermolecular force including pressure solution at grain contact, as shown by the above physical properties of the dry singing sands.(2)The intergranular friction becomes lower in sufficiently sands with very smooth grain-surfane, especially under water.(3)Puzzling high shear-resistance shown by singing sands under water regardless of low friction may be explained as caused by dense packing (higher coordination number) realized by lower intergranular friction.(4)The incipient failure in a singing sand layer under water may show a different deformation style from dry singing sands with apparent slip plane and from usual sands with ductile deformation when applied lower stress.The stress-strain relationship as well as deformation style is, therefore, stlongly affected by intergranular friction.

这项研究的重点是晶间摩擦是与软囊泡变形样式相反的主要因素。为了验证此问题，需要具有不同晶体间摩擦的物质，但需要具有相同的物理特性。唱歌的沙子就是这样一种材料之一，因为它们显示出比通常的沙子更高的摩擦，并且由于水中的长期抛光而改变了。同样，我们可以更改实验室中沙子的摩擦特性。检查了各种物理特性，例如孔隙率，砂斜率的安息角，剪切抗性角度以及叶片剪切强度，以在空气和水中使用各种沙子。在空气和水中的剪切中，还检查了变形蛋白样式，包括声音产生的状况。随着结果的结果；（1）在足够的抛光沙子中播出的晶间摩擦变得更高，这可能是由于分子间力包括在谷物接触时的压力溶液，如干式唱片的上述物理特性所示。（2）在谷物中尤其是在水中，较低的s s salls sansighand of shers s s s s s s s s s s s s s s s s s s s s s s s s s s s s s s s s salls s s s salls s s s salls s s salls s s s s salls s sarls s s s salls comectional的较低较低。（3）较低。（3）解释是由较低的晶间摩擦实现的致密堆积（较高的协调数）引起的。（4）在水下唱歌的砂层中的初期故障可能显示出与具有明显滑动平面的干式砂的变形样式不同的变形样式，并且在施加较低的压力时，正常情况下的压力变形。