Interaction mechanism between deep mixing column and surrounding clay during installation
Interaction mechanism between deep mixing column and surrounding clay during installation
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DOI：
10.1139/t02-109
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发表时间：
2003-04
影响因子：
3.6
通讯作者：
S. Shen;N. Miura;H. Koga
中科院分区：
文献类型：
--
作者：
S. Shen;N. Miura;H. Koga
实验室和现场调查表明，在安装后的短时间内，深层搅拌（DM）柱附近周围粘土的抗剪强度增加。现场观测结果表明，安装过程中会产生明显的超静孔压，其值可能高于水力劈裂压力，安装过程中DM柱与周围粘土相互作用的行为可以用圆柱形孔洞的剪切-膨胀过程来模拟。提出了一种简单的方法来计算安装过程中DM柱周围的超静孔隙水压力。所提出的计算方法考虑了混合期间由旋转叶片引起的剪切力的影响。在所提出的方法中，超孔隙水压力表示为粘土的不排水强度，剪切力，注射压力，和孔隙水压力参数。提出了一种基于拉伸破坏机理的粘土破裂分析方法。分析结果…
Laboratory and field investigation has shown that the shear strength of the surrounding clay increased in the vicinity of a deep mixed (DM) column in the short period following installation. Field observations indicated that significant excess pore pressure, which may be higher than the hydraulic fracture pressure, was generated during installation.The behaviour between a DM column interacting with the surrounding clay during installation can be simulated as the shearing-expanding process of a cylindrical cavity. A simple approach is proposed to calculate the excess pore pressure around a DM column during installation. The proposed method of calculation considers the effect of a shearing force caused by rotating blades during mixing. In the proposed approach, the excess pore pressure is expressed in terms of undrained strength of clay, shearing force, injection pressure, and a pore pressure parameter. An approach is developed to analyze clay fracturing using a tensile failure mechanism. Analytical results...