School of Architectural and Civil Engineering, Zhongyuan University of Technology, Zhengzhou, Henan, China.
Department of Civil Engineering Mechanics, Yellow River Institute of Hydraulic Research, Zhengzhou, Henan, China.
PLoS One. 2024 Sep 10;19(9):e0308364. doi: 10.1371/journal.pone.0308364. eCollection 2024.
To explore the mechanical properties of weak expansive soil under different moisture contents and confining pressures.
The triaxial remolded soil samples with different moisture contents (14%, 16%, 18%, and 20%) were prepared for the obtained Nanyang weak expansive soil. Four groups of 16 consolidated drained triaxial shear tests with a confining pressure of 50, 100, 200, and 300 kPa were carried out to study the effects of confining pressure and water content on the deviatoric stress and pore pressure of weak expansive soil with strain.
The study showed that the shear strength of weak expansive soil samples gradually increased with the increase of the water content, but its increase nonlinearly decreased as the confining pressure increased. When the axial strain was small, the pore pressure significantly increased, and the pore pressure increased tended to be stable slowly and gradually as the axial strain gradually increased. Therefore, the research results could be used to avoid the diseases caused by the characteristics of weak expansive soil in engineering construction and provide theoretical references for improving engineering foundations in weak expansive soil areas.
探讨不同含水量和围压下弱膨胀土的力学特性。
为获得南阳弱膨胀土，制备了不同含水量（14%、16%、18%和 20%）的三轴重塑土样。进行了四组围压为 50、100、200 和 300kPa 的固结排水三轴剪切试验，以研究含水量和围压对弱膨胀土应变时的偏应力和孔隙水压力的影响。
研究表明，弱膨胀土试样的剪切强度随含水量的增加而逐渐增大，但随围压的增加，其增加非线性减小。当轴向应变较小时，孔隙水压力显著增大，随着轴向应变逐渐增大，孔隙水压力逐渐趋于稳定。因此，研究结果可用于避免工程建设中弱膨胀土特性引起的病害，并为改善弱膨胀土地区工程基础提供理论参考。
