摘要
提出了一种利用原位试验成果求解非均质非线弹性地基最终沉降的新方法。对分层原状土载荷试验或螺旋板试验成果进行双曲线拟合,建立分层原状土切线模量与竖向附加应力的关系方程;在沉降计算公式中引入附加应力修正系数,以考虑基础埋深、地基非均质非线性特征等因素对应力分布的影响;利用双曲线切线模量方程及附加应力弹性解,可准确求解地基的总沉降。通过对几个压板载荷试验成果的拟合分析,得出了各土类的双曲线切线模量方程,用于求解地基在各级荷载下的沉降。计算结果表明,计算值与实测值吻合得很好。该方法原理简单、参数可靠、结果准确,为地基沉降计算开辟了一条新途径。
A new technique is proposed to calculate final settlement for non-isotropic, nonlinear elastic subsoils by using the data of in-situ tests. Firstly, hyperbolic curves are fitted out from the data of load tests or screw plate tests on stratified, undisturbed soils. Secondly, the relationships between additional stresses and tangent modulus of the soils are established; and additional stress factor is added to consider the influences of foundation depth, non-isotropic and nonlinear elastic character. Finally, the total final settlement is calculated by using hyperbolic curve tangent modulus equation and additional stresses. After fitting hyperbolic curves from the data of load tests, different equations of hyperbolic curve tangent modulus for soils are obtained to find the settlements under different loads. The calculated results show that, the predicted settlements are well in agreement with those from load tests. This technique may be potential to calculate settlements with its simple principle, reliable parameters and accurate results.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2008年第7期1987-1992,共6页
Rock and Soil Mechanics
关键词
地基沉降
载荷试验
双曲线切线模量方程
附加应力修正系数
附加应力
ground settlement
load test
hyperbolic curve tangent modulus equation
additional stress level factor
additional stresses
