粉喷桩复合地基水平荷载原型试验研究

In-Situ Experimental Investigation of the Hoizontal Loads for Composite Foundation of Dry-Injeting Cement Mixing Piles

通过对天井湖引河闸粉喷桩复合地基的原型水平荷载试验研究，可以看到粉喷桩加固淤泥质软土地基的效果是显著的．天然淤泥质地基的C＝13．5kPa，＝10．8°，K＝tg＝0．20，用粉喷桩加固后复合地基的C＝36kPa，＝22．2°，K＝tg＝0．41，对于校长6．1m的粉喷极复合地基在水平荷载作用下，弯矩分布的深度为荷载板以下3．8m左右，最大弯矩出现在深度约0．8～1．3m的范围内．

In-situ experiments on the composite foundation of dry-injecting Cement mixing piles under horizontal loads of Tianjinghu Sluice have shown obviously that the drysiinjecting Cement mixing piles can strengthen effectively the soft silt base of structures. The testing parameters of this composite foundation are C = 36 kPa, = 22. 2°and K=tg = 0. 41, while the natural data are C= 13. 5 kPa, = 10. 8°and K =tg = 0. 20respectively before reinforcement. The depth of action of bending moment caused by horizontal loads is about 3. 8 m beneath the loading plate, and the maximum bending moment is observed within the limits of 0. 8~1.3m, while the length of a pile is 6. 1m.