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采用砂垫层作人工地基可提高地基土的承载力,并通过砂垫层减小软弱土层所承受的压力,减少基础沉降。砂垫层透水性良好,可通过它排出软土中的部分水分,从而加速软土固结。一、砂垫层的设计设计砂垫层,主要是确定垫层的合理截面,使垫层和软弱下卧层的强度和变形满足建筑物的要求。 1.砂垫层的厚度:垫层厚度应根据垫层底部软弱土的承载力确定,即作用在砂垫层底面处土的自重应力与附加应力之和应不大于软弱土层的容许承载力(图1)。σ_(h+d)+σ_d≤R_(h+d)或
The use of sand cushion as artificial foundation can increase the bearing capacity of the foundation soil, and reduce the pressure on the soft soil layer through the sand cushion to reduce the foundation settlement. The sand cushion has good water permeability, and it can discharge part of the water in the soft soil, thereby accelerating the consolidation of the soft soil. First, the design of sand cushion sand mat, mainly to determine the reasonable cross section of the cushion, so that the strength and deformation of the cushion and the soft underlying layer to meet the requirements of the building. 1. The thickness of the sand cushion: The thickness of the cushion shall be determined according to the bearing capacity of soft soil at the bottom of the cushion, that is, the sum of the self stress and the additional stress of the soil acting on the bottom of the sand cushion shall not be greater than the allowable bearing capacity of the soft soil layer. (figure 1). Σ_(h+d)+σ_d≤R_(h+d) or