jgj94-94建筑桩基技术规范英文版

jgj94-94建筑桩基技术规范英文版内容摘要：

t coefficient for overall pile lateral resistance and end resistance – the ratio of foundation pile average limit bearing capacity in the group pile to the average limit bearing capac ity of a single pile. Group pile effect coefficient for cap bottom soil resistance – the ratio of cap bottom average limit soil resistance in the group pile to the foundation soil at cap bottom limit resistance. Negative friction resistance – the downward friction resistance produced by soil on the pile lateral surface as a result of settlement of soil around the pile body greater than that of the pile body due to self solidification, saturated yielding by gravity and additional load on ground. At a given depth of the pile body, the displacement of both pile and soil is the same, and this point is referred to as the neutral point. The neutral point is the demarcation point of positive and negative friction resistance. Downdrag – for a single pile foundation, the accumulated value of negative friction resistance above the neutral point is the downdrag. For pile foundations in group pile foundation, the group pile effect 3 coefficient of negative friction resistance should also be taken into consideration, . the downdrag shall be discounted by multiplying the downdrag of the single pile with the corresponding group pile effect coefficient of negative friction resistance. Blocking effect – during sinking of an open end pipe pile, part of soil at the pile end is squeezed to the periphery, while part enters the pipe to form the “soil plug”. Certain pression will take place in the soil plug under the friction resistance action of the pipe wall, and the height of soil plug and degree of blocking is related to a number of factors, such as soil property, pipe diameter, wall thickness and the depth by which the pipe enters the bearing layer. The degree of blocking has a direct bearing on the action of end resistance, the damage property and pile bearing capacity. This is referred to as “blocking effect”. Signs Resistance and material property qsik — characteristic value of limit lateral resistance of the ith layer of soil for a single pile。 qpk — characteristic value of limit end resistance of a single pile。 qck — characteristic value of limit resistance of foundation soil at cap bottom。 Qsk, Qpk — characteristic value of total limit lateral resistance and total limit end resistance of a single pile。 Quk — characteristic value of single pile vertical limit bearing capacity。 Qck — characteristic value of the total limit resistance of foundation soil at cap bottom corresponding to any posite foundation pile。 R — design value of vertical bearing capacity of the posite foundation pile or foundation pile in the pile foundation。 Uk — characteristic value of antiextracting limit bearing capacity of a single pile。 Ugh — characteristic value of antiextracting limit bearing capacity of any foundation pile in group pile。 Rh1 — design value of horizontal bearing capacity of posite foundation pile or foundation pile。 Rh — design value of horizontal bearing capacity of a single pile。 Ps — specific peration resistance value of single probe in static sounding。 fs, qc — average lateral resistance and average end resistance of double probes in static sounding。 m — proportional coefficient of horizontal resistance coefficient of pile lateral foundation soil。 frc — saturated singleaxis pression strength of rock。 ft, fc — design value of concrete tensile and pression strength。 Es — pression modulus of soil。 γ, γe — unit weight and effective unit weight of soil. Action and action effect F — design value of the vertical force acting on the top of pile foundation cap。 G — design value of weight of pile foundation cap and soil on the cap。 Ni — design value of vertical force on the ith posite foundation pile or foundation pile。 Mx, My — moment of external force acting on cap bottom with respect to x and y axis of the group 4 pile pattern。 H — design value of horizontal force acting on the cap bottom。 H1 — design value of horizontal force acting on any posite foundation pile or foundation pile。 qnsk — characteristic value of average negative friction resistance of a single pile。 Qnk — characteristic value of downdrag acting on the side of a single pile。 Qngk — characteristic value of downdrag acting on any foundation pile of the group pile。 qf — design value of tangent frost heaving force。 s — final settlement of pile foundation。 Geometric parameters sn — center spacing of piles。 l — length of pile body。 d — design diameter of pile body。 D — design value of pile end enlarged bottom ds — outer diameter of steel pipe pile。 u — peripheral length of pile body。 Ac — area of cap bottom。 A — section area of pile body。 Ap — area of pile end。 An — converted sectional area of pile body。 hn — converted depth of pile。 Lc — length of cap。 Bc — width of cap。 zn — calculated depth of pile foundation settlement (starting from end plane). Calculation coefficients γ0 — importance coefficient of building pile foundation。 γs, γp — partial safety factor of pile lateral resistance and end resistance。 γsp — partial safety factor of overall pile lateral and end resistance。 γc — partial safety factor of resistance of cap bottom soil。 ηs, ηp — group pile effect coefficient of pile lateral resistance and end resistance。 ηsp — group pile effect coefficient of overall pile lateral and end resistance。 ηc — group pile effect coefficient of cap bottom soil resistance。 ηf — influential coefficient of frost heaving。 ξs, ξp — correction coefficient of lateral resistance and end resistance of section inlaid in rock。 ψs, ψb — dimension effect coefficient of lateral resistance and end resistance of large diameter pile。 γs。