【摘要】 为了将原位载荷试验应用于地基沉降计算,以延安地区黄土填土工程为实例依托,采用弹性理论中的应变影响系数和完全侧限点的应力应变关系理论,推导了利用载荷试验结果计算地基压缩模量的方法。研究结果表明:符合完全侧限应力状态的点位于载荷板中心点下0.834倍荷载板半径R处;将载荷试验结果中荷载P乘以0.737、荷载板沉降S乘以0.522与荷载板半径R的比值,可将载荷试验的P-S曲线转化成单向压缩的应力-应变曲线,进而可以计算出压缩模量;由该文方法计算的压缩模量均值与室内试验测试结果均值一致,两者平均值的差异仅为5.53%;由于原位测试避免了对土样的扰动,所以得到的压缩模量的离散性低于室内试验测试结果,方差减小了57.2%。研究成果可为压缩模量的测试方法和地基沉降计算方法的拓展提供参考。更多还原

【Abstract】 In order to apply the situ loading test to the calculation of foundation settlement,this paper adopted theoretical derivation to calculate the compressive modulus of the loess foundation in Yan’an based on the test data.The results show that the point that conforms to complete confining stress state is located in 0.834 times of the radius under the center of loading plate.The PScurves of the loading test can be transformed into uniaxial compressive stress-strain curves through multiplying the load(P)by 0.737 and multiplying the settlement(S)by the ratio between 0.522 and the radius of loading plate(R).And then,the compressive modulus is obtained.The average of the compressive modulus obtained from the present method is in agreement with the laboratory test results,and the difference between them is only 5.53%.Due to the prevention of the soil disturbance,the dispersion of the compressive modulus form the present method is lower than the laboratory test results,with variance reduction of 57.2%.The result of the present paper provides reference for the improvement of the test method of compressive modulus and the calculation of the foundation.更多还原