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P_0在地基工程中是一项很重要的指标。它涉及土工试验,地基评价和地基计算等方面。在三轴试验中规定,对软塑和流塑状态的软土,要采用P_0等向固结后再作不排水压缩试验。对超固结土评价,要把Pc与P _0进行比较。Pc>P_0为超固结土,否则为正常固结土或次固结土。求修正后的允许承载力R=[R]+m_Bγ(B-3)+m_Dγ_P(D-1.5),计算基底压力P=(N+G)/F和确定压缩层下限σ_zp≤0.1～0.2σ_(z(?))等公式中,都与土自重有密切关系。γ的取值直接影响工程设计。
P_0 is a very important indicator in foundation engineering. It involves aspects such as geotechnical testing, foundation evaluation and foundation calculation. In the triaxial test, it is stipulated that the soft soil in the soft plastic and flow-plastic state should be subjected to the undrained compression test after isotactic consolidation with P_0. For the evaluation of overconsolidated soils, compare Pc with P_0. Pc>P_0 is an overconsolidated soil, otherwise it is a normal consolidated soil or a secondary consolidated soil. Determine the allowable bearing capacity R = [R] + m_Bγ (B-3) + m_Dγ_P (D-1.5), calculate the base pressure P = (N + G) / F and determine the lower limit of the compression layer σ_zp ≤ 0.1 ~ 0.2 σ _ (z(?)) and other formulas are closely related to the weight of the soil. The value of γ directly affects the engineering design.