静力触探判别软土固结历史

确定地基土的固结历史对计算其变形和强度特性有着重要的作用。以福建沿海地区软土为例,应用静力触探测试技术进行软土固结状态的判别。结果表明,正常固结软土其锥尖阻力与深度曲线的拟合直线延长线与坐标原点近似相交,超固结软土则与横轴(正轴)有一截距,欠固结软土则与横轴(负轴)有一截距。根据截距大小可进一步判别软土固结程度。利用静力触探技术判别软土固结历史能避免采取土样及室内土工试验对土样的扰动,结果能反映土体实际固结状态。研究结果对合理评价软土的特性、对软土地基的沉降变形计算具有理论及实际意义。

CONSOLIDATION STATE OF SOFT SOIL DIFFERENTIATED BY STATIC CONE SOUNDING

The consolidation state of soft soil is of significance for evaluation of deformation and strength of foundation soil. The consolidation state of soft soil in the coastal area of Fujian Province is differentiated by static cone sounding. For the normal consolidation state,the fitting beeline of static cone sounding of soft soil between cone resistance and test depth intersects the x-coordinate at the origin approximately;for the overconsolidation state,intersects the positive x coordinate;and for the underconsolidation state,intersects the negative x coordinate. The consolidation state of soft soil can be differentiated by the intercept of the line. The consolidation state of soft soil,tested by in-situ static cone sounding,fits the actual condition of soft soil;and the method can be used for the evaluation of the consolidation state of soft soil.