土体dp模型参数取值(国外英文资料).doc

土体dp模型参数取值(国外英文资料) The model that ANSYS can use for geotechnical materials is only the DP model. DP model is the ideal elastic-plastic model, ideal elastic-plastic stress (under complex stress conditions should be equivalent stress) reach the yield limit, stress increases no longer, but the strain growth. In ANSYS, the DP model requires input 3 parameters, cohesion c, internal friction Angle fai, expansion Angle faif, and the expansion Angle faif is used to control the volume expansion. In geotechnical engineering, the size of the solid soil and super solid soil will expand when shear occurs because the particles are rearranged. The average sandy soil, or the normally consolidated earth, will only be clipped. So when you use the DP model, the expansion Angle faif set to 0 is more realistic for general soil. For the other two parameters, c, the internal friction Angle fai, which specifies the following relationships in the DP model (for simplicity, the internal friction Angle fai is called x, which is the sine of fai = sin x) The yield equation: sigma (stress) = 6 ccosx / [3 ^ 0.5 * (3 - sinx)], three of them ^ 0.5 express the operation of the square root of 3, * for multiplication sign So lets say that cosine of x is not equal to zero, and were going to divide the numerator and denominator of the yield equation by cosine of x, and were going to get the following formula Sigma (stress) = 12 ^ 0.5 c/(3 / cosx - tanx) Assume sigma peak and derivation operation, because the sigma value curve slope is zero, it is known that, at the time of take x 19.47 degrees, can have the biggest yield limit (yield stress). The following relation (assuming c = 20kpa, the internal friction Angle fai (x) is constantly changing, and the expansion Angle faif) depends on the yield equation. Angle/yield stress 0/23.094 10/24.14 19.47/24.495 20/24.494 30/24 40/22.515 50/19.935 60/16.233 70/11.501 80/5.970 90/0 The above figures show that under certain conditions of cohesion, the yield stress