旁压试验在天津地区确定地基土承载力的修正研究

摘要:

地基土中旁压试验机理近似于载荷试验，反映出了土体弹塑性体的受力变化特性，通过旁压试验临塑压力pf、极限压力pL两种方式可快速方便地确定承载力特征值。确定承载力特征值过程中选用合理的修正系数λ与安全系数K值，能够保证旁压试验结果应用的准确性及适用性。本文通过与土工试验、静力触探试验指标查表法确定的承载力数值对比分析，适当调整修正系数λ与安全系数K，得到了较为客观可靠的旁压试验承载力特征值。

Abstract:

In foundation soil the mechanism of Pressuremeter test is similar to the plate loading test，the stress variation characteristics of soil elastoplastic body are reflected，with two ways of plastic pressure pf and limit pressure pL the characteristic value of bearing capacity can be determined quickly and conveniently in the Pressuremeter test. In the process of determining the characteristic value of bearing capacity reasonable correction factor λ and safety factor K can ensure the accuracy and applicability of the Pressuremeter test results. In this paper，the numerical analysis of bearing capacity being compared with that of Geotechnical test and Static penetration test，through adjusting the correction factor λ and safety factor K appropriately，more objective and reliable characteristic values of foundation bearing capacity are obtained.