按桩顶沉降控制法确定水泥搅拌桩有效桩长  

DETERMINATION OF EFFECTIVE LENGTH OF CEMENT-MIXING PILE WITH THE CONTROL METHOD OF SETTLEMENT OF TOP PILE

作　　者：曾友金[1] 章为民[1] 

机构地区：[1]南京水利科学研究院土工研究所,南京210024

出　　处：《工业建筑》2003年第1期32-35,38,共5页Industrial Construction

摘　　要：采用线弹塑性荷载传递函数 ,按桩顶沉降控制法确定水泥搅拌桩的有效桩长。分析了桩的刚度系数、桩端土持力层弹性模量与桩周土弹性模量之比值、桩侧极限位移、桩径及土的泊松比等因素对水泥搅拌桩有效桩长的影响。结果表明 ,除土的泊松比对水泥搅拌桩有效桩长的影响不明显外 ,其余因素均有一定或较大的影响 ,并与弹性理论法分析结论一致。在桩的刚度系数较大且整根桩都搅拌得较均匀而使得整根桩的强度较高的情况下 ,水泥搅拌桩有效桩长能超过 2 0m。According to the control method of settlement of top pile, effective length of a cement\|mixing pile is analyzed and calculated with the linear elastic\|plastic function of load transfer. Influence factors of effective length, such as coefficient of rigidity of pile, elastic modulus ratio of the bottom soil and surrounding soil, side ultimate displacement, pile′s diameter and Poisson′s ratio of soil are thoroughly analyzed. It can be seen that the factors have certain effects on the effective length except Poisson′s ratio of soil. Analytic results agree to analytic conclusions with the elastic theory method. When coefficient of rigidity of pile is large and the whole pile is equally mixed, effective length of cement\|mixing pile can exceed 20 meter.

关 键 词：水泥搅拌桩 有效桩长 荷载传递 弹性理论法 

分 类 号：TU753.3[建筑科学—建筑技术科学]