佳木斯大学学报（自然科学版）
佳木斯大學學報（自然科學版）
가목사대학학보（자연과학판）
JOURNAL OF JIAMUSI UNIVERSITY (NATURAL SCIENCE EDITION)
2014年
5期
703-706,710
,共5页
修正剑桥模型%沉桩%圆孔扩张%孔径%挤土效应
脩正劍橋模型%沉樁%圓孔擴張%孔徑%擠土效應
수정검교모형%침장%원공확장%공경%제토효응
modified Cam-clay model%pile driving effect%cavity expansion%preboredhole diameter
为研究预钻孔孔径大小对沉桩挤土效应的影响，基于修正剑桥模型的圆孔扩张理论解答，把沉桩过程看作不排水的圆柱形孔扩张的过程，把桩周土体分为塑性区与弹性区，对比分析不同预钻孔孔径下沉桩产生的塑性区半径、桩土接触压力、桩周土体位移、孔隙水压力。分析表明土体性质及修正剑桥模型中的参数对挤土效应均有影响，其中各向同性超固结比对挤土效应的影响最大，当预钻孔孔径小于一定值时，孔径大小变化对挤土效应影响不明显。本文分析可以为沉桩工程提供理论参考。
為研究預鑽孔孔徑大小對沉樁擠土效應的影響，基于脩正劍橋模型的圓孔擴張理論解答，把沉樁過程看作不排水的圓柱形孔擴張的過程，把樁週土體分為塑性區與彈性區，對比分析不同預鑽孔孔徑下沉樁產生的塑性區半徑、樁土接觸壓力、樁週土體位移、孔隙水壓力。分析錶明土體性質及脩正劍橋模型中的參數對擠土效應均有影響，其中各嚮同性超固結比對擠土效應的影響最大，噹預鑽孔孔徑小于一定值時，孔徑大小變化對擠土效應影響不明顯。本文分析可以為沉樁工程提供理論參攷。
위연구예찬공공경대소대침장제토효응적영향，기우수정검교모형적원공확장이론해답，파침장과정간작불배수적원주형공확장적과정，파장주토체분위소성구여탄성구，대비분석불동예찬공공경하침장산생적소성구반경、장토접촉압력、장주토체위이、공극수압력。분석표명토체성질급수정검교모형중적삼수대제토효응균유영향，기중각향동성초고결비대제토효응적영향최대，당예찬공공경소우일정치시，공경대소변화대제토효응영향불명현。본문분석가이위침장공정제공이론삼고。
Based on the modified Cam -clay model and the cavity expansion method , the process of pile driving was considered as cylindrical cavity expansion along the pile .Soil around the pile was divided into two zones:plastic zone and elastic zone .This paper analyzed the influence of different preboredhole diameters on ra-dius of plastic zone , contact pressure between pile and soil , soil displacement and pore water pressure around the pile when driving piles .Analysis showed that both soil properties and modified Cam -clay model parameters can influence the driving effect , whose isotropic over consolidation ratio is the most important factor .When the pre-boredhole diameter is smaller than a critical one , it has a little impact on the driving effect .This paper aims to provide a theoretical analysis reference for pile driving practice .
