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Field and laboratory study of stress relief due to unloading in block samples of sensitive clay

机译：敏感粘土嵌段样本卸载引起的应力缓解的现场与实验室研究

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摘要

A block sample goes through stress changes during and after sampling. Sensitive clays are affected by sample disturbance and stress changes have a great effect on sample quality. Reduction of the in-situ total stresses to zero causes a soil sample to develop a negative pore pressure. In an ideal situation, a block sample retains its negative pore pressure during sampling and storage, preventing it from swelling. To study this, five in-situ tests were conducted in which the pore pressure variations inside block samples were monitored during and after sampling. The pore pressure was measured continuously during a storage period of several days and the results were compared with tests on reconstituted clay in an attempt to simulate the same stress conditions as those in situ. Similar to the in-situ tests, the pore pressure inside the reconstituted samples was measured throughout the test. The findings suggest that the negative pore pressure in mini-block samples may be reduced in a matter of minutes or hours after sampling. Parallel testing on mini-block and reconstituted clay samples indicated that pore pressure dissipation had a negative effect on the preconsolidation pressure, constrained modulus and sample quality.
机译：在采样期间和之后，块样本经过压力变化。敏感粘土受样品干扰的影响，压力变化对样品质量有很大的影响。将原位总应力降低为零导致土壤样品产生负孔隙压力。在理想情况下，块样品在取样和储存期间保持其负孔隙压力，防止其免于肿胀。为了研究这一点，进行了五种原位测试，其中在抽样期间和之后监测嵌段样品内的孔隙压力变化。在储存期间连续测量孔隙压力，并将结果与​​对重构粘土的测试进行比较，试图模拟与原位原位相同的应力条件。类似于原位测试，在整个测试中测量重构样品内的孔隙压力。结果表明，在取样后的几分钟或小时内，可以减少迷你块样品中的负孔隙压力。在迷你嵌段和重构粘土样品上并行测试表明孔隙压力耗散对前透镜压力，约束模量和样品质量具有负面影响。

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