【Daily Question】Utilities - Civil Engineering - 20200103

2020-01-03View Original

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When constructing building foundations in soil layers where the seepage hydraulic gradient is less than the critical hydraulic gradient, it is possible that (). A. Mild flow sand B. Moderate flow sand C. Severe flow sand D. Mechanical piping 【Answer】D 【Explanation】When the hydraulic gradient of the seepage water is less than the critical hydraulic gradient, flow sand phenomenon does not occur; however, the fine particles in the soil can still be carried away by the seepage water through the pores between the coarse particles. Over time, tubular voids are formed in the soil layer, which destroys the soil structure, reduces its strength, and increases its compressibility; this phenomenon is known as mechanical gullitation.

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【Daily Question】Utilities - Civil Engineering - 20200103

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