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Objective Evaluation of Preconsolidation Stress for Soft Clays from Constant Rate of Strain Pore Pressure Data

机译：从恒定孔隙率压力数据评估软土的预固结应力

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A simple and direct procedure for estimating the preconsolidation stress (σp) from constant rate of strain consolidation (CRS) excess pore pressure data is described. For soft clays, excess pore pressure (ub) measured at the base of a CRS test specimen normalized by total vertical stress (σv) almost always reaches a distinct minimum value during the test. The vertical effective stress (σ1v) at the minimum value of ub/σv corresponds well with σ1p as determined from commonly used interpretation methods such as Casagrande construction and the strain energy method. The method of σ1p = σv at the minimum ub/σv is straight forward and objective; whereas most existing σ1p interpretation methods use log scales, require graphical construction procedures and often subjective interpretation of the construction. Examples are given in the paper for a variety of soft clays from test sites located worldwide.

机译：描述了一种简单而直接的程序，用于根据恒定的应变固结速率（CRS）多余孔隙压力数据估算预固结应力（σp）。对于软粘土，在CRS测试样品底部测得的通过总垂直应力（σv）归一化的过大孔隙压力（ub）几乎总是在测试过程中达到一个明显的最小值。 ub /σv最小值处的垂直有效应力（σ1v）与σ1p很好地吻合，这是通过常用的解释方法（例如卡萨格兰德构造和应变能方法）确定的。最小ub /σv时σ1p=σv的方法是直接而客观的。而大多数现有的σ1p解释方法使用对数标度，需要图形化的构造程序，并且通常需要对构造进行主观解释。论文中举例说明了来自世界各地测试地点的各种软粘土。

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《GEO-DENVER 2007》|2007年|P.1-10|共10页
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Don J. DeGroot; Melissa M. Landon; Robert M. Ryan;
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中图分类土力学、地基基础工程;
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1. Impact of Shear Stress on Strain and Pore Water Pressure Behavior of Intact Soft Clay Under Principal Stress Rotation [J] . Zhou Jian, Xu Changjie Geotechnical testing journal . 2014,第3期

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2. Effect of strain rate on pore pressure evolution and effective stress path of soft soil under different stress history conditions [J] . Gundeep K.Sudan, Ajanta Sachan International journal of geotechnical engineering . 2017,第1期

机译：应变速率对不同应力历史条件下软土孔隙压力演化及有效应力路径的影响
3. Comment on "Strain and pore pressure development on soft marine clay in triaxial tests with a large number of cycles" published in Ocean Engineering. (2013) 74:125-132 [J] . Jamali Hassan Ocean Engineering . 2017,第nova15期

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4. Objective Evaluation of Preconsolidation Stress for Soft Clays from Constant Rate of Strain Pore Pressure Data [C] . Don J. DeGroot, Melissa M. Landon, Robert M. Ryan GEO-DENVER . 2007

机译：菌株孔隙压力数据恒定率的软粘土预溶解应力的客观评价
5. Use of the 9-arm self-boring pressure meter to measure horizontal in situ stress, stress anisotropy, and stress-strain behavior in soft clay. [D] . Findlay, R. Craig. 1991

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Objective Evaluation of Preconsolidation Stress for Soft Clays from Constant Rate of Strain Pore Pressure Data

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