长板短桩复合地基桩土应力比试验研究

FIELD TEST STUDY ON STRESS RATIO OF PILE TO SOIL IN COMPOSED GROUND OF THE CEMENT MIXING PILE COMPOSITE FOUNDATION COMBINED WITH PREFABRICATED VERTICAL DRAIN

通过在上海A15公路上进行的长板短桩现场试验,分析了长板短桩工法中桩土应力分配情况,得到了桩土应力比参数。试验结果表明:水泥土搅拌桩桩长较短,在受到荷载时可以向下刺入变形,并且通过排水固结作用提高地基土的强度,更大地发挥桩间土的承载力,导致长板短桩工法比常规的地基处理方法的桩土应力比要稍小。

Field test research is carried out on the pile-soil stress ratio of the D-M method on the foundation of A15 highway in Shanghai. On the basis of the test data, the stress ratio of the pile to soil and the bearing capacity is calculated. The result shows that： the cement mixing pile is short, it can pierce down into the soils. And for the intensity is raised by the prefabricated drain the soil can bare more load . So that the pilesoil ratio of the D-M method is less than the conventional method.