Multivariate Regression Analysis On Influencing Factors Of The Building Bearing Capacity Of Foundation In Hebei Province

The bearing capacity of Foundation is ground’s ability to bear. Determination of the bearing capacity of Foundation cannot be underestimated, are important issues in engineering survey and design. Influence factors of bearing capacity of Foundation is a variety, methods of determining bearing capacity of foundations are also not the same.We collection of706group integrated comparison information of load test of different landforms unit of Hebei province, and combination actual geological situation of Hebei Province, on Varied effect factors of foundation bearing capacity, using Univariate regression analysis、Bivariate regression analysis, the multiple regression, cluster statistic analysis,grey associated theory and so on, draw its regression curve, determines its regression target and summary out the effect when different effect factors combination on foundation bearing capacity in this area. Putting forward the correlations between empirical calculating formula、bearing capacity characteristic value and the physical and mechanical indexes of geotechnical test、loading test and other testing of in-situ test. As for soft soil in littoral area, the characteristic value of Foundation bearing capacity, relative to liquidity index(IL) and specific penetration resistance(Ps) isfak=47.396-11.899/L+79A29PS.And cohesive soil in piedmont plain, the characteristic value of Foundation bearing capacity, relative to liquidity index and specific penetration resistance is fak=109.405+19.278Ps-59.583IL;the characteristic value of Foundation bearing capacity, relative to natural water content(w) and compression modulus(ES) is fak=150598+7.899Es-3.98lw;the characteristic value of Foundation bearing capacity, relative to natural water content、compression modulusand void ratio(e) is fak=596570-7.449v-290788+243Es; the characteristic value of Foundation bearing capacity, relative to compression modulus、natural water content and specific penetration resistance is fak=133.558+7.298Es-3.890w+11.932Ps and so on。And comparative analysis of the results and conclusions, are given by the current codes, establishing diagrams of comparative analysis and drawing analysis curves three-dimensional histograms、3D-cluster analysis of scatter, and so on.The results show that Revised bearing capacity characteristic value of the standard just is the special case of bearing capacity of basic values. When considered multiple different effect factors, characteristic value of foundation bearing capacity is large of different with that only considered single effect factor. Generally, Single factors areconsidered analysis a certain effect factors, and assumption other effect factors areconservative; and multivariate can considered analysis different factors at the sametime,which can improve accuracy and reliability of characteristic value of foundationbearing capacity, Give full play to bearing capacity of Foundation, reducing the cost ofground treatment, improve work efficiency, and increase efficiency. Hope that thiswork will enrich and perfect the method of determining the bearing capacity ofFoundation, both and reference utilization by practical.