岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2014年
5期
1303-1310
,共8页
散体材料桩复合地基%未打穿%等效双层地基%平均固结度%解析解
散體材料樁複閤地基%未打穿%等效雙層地基%平均固結度%解析解
산체재료장복합지기%미타천%등효쌍층지기%평균고결도%해석해
composite ground with granular columns%partial penetration%equivalent-double-layered ground%average degree of consolidation%analytical solution
利用平均固结度普遍解，将未打穿散体材料桩复合地基转化为等效双层地基，推导出未打穿散体材料桩复合地基固结简化解，给出其平均固结度计算简化公式。根据简化解、现有解和有限单元法编制程序，绘制考虑贯入比、桩体渗透系数、土体扰动区渗透系数和土体扰动区影响因子等因素对固结的影响曲线图，分析了各因素对未打穿散体材料桩复合地基固结性状的影响，并对3种计算方法所求出的平均固结度进行了比较研究，进而探讨了简化解的适用性。研究结果表明，无论是在单面排水还是在双面排水条件下，简化解求出的平均固结度总体上是介于现有解和有限单元法二者之间，尤其在固结过程的“中后期”（即固结度≥50%时）。从实用角度来看，简化解的计算结果具有足够精度，且简便、实用；在各种影响因素中，散体材料桩长度和桩体渗透系数对固结过程的影响最大。
利用平均固結度普遍解，將未打穿散體材料樁複閤地基轉化為等效雙層地基，推導齣未打穿散體材料樁複閤地基固結簡化解，給齣其平均固結度計算簡化公式。根據簡化解、現有解和有限單元法編製程序，繪製攷慮貫入比、樁體滲透繫數、土體擾動區滲透繫數和土體擾動區影響因子等因素對固結的影響麯線圖，分析瞭各因素對未打穿散體材料樁複閤地基固結性狀的影響，併對3種計算方法所求齣的平均固結度進行瞭比較研究，進而探討瞭簡化解的適用性。研究結果錶明，無論是在單麵排水還是在雙麵排水條件下，簡化解求齣的平均固結度總體上是介于現有解和有限單元法二者之間，尤其在固結過程的“中後期”（即固結度≥50%時）。從實用角度來看，簡化解的計算結果具有足夠精度，且簡便、實用；在各種影響因素中，散體材料樁長度和樁體滲透繫數對固結過程的影響最大。
이용평균고결도보편해，장미타천산체재료장복합지기전화위등효쌍층지기，추도출미타천산체재료장복합지기고결간화해，급출기평균고결도계산간화공식。근거간화해、현유해화유한단원법편제정서，회제고필관입비、장체삼투계수、토체우동구삼투계수화토체우동구영향인자등인소대고결적영향곡선도，분석료각인소대미타천산체재료장복합지기고결성상적영향，병대3충계산방법소구출적평균고결도진행료비교연구，진이탐토료간화해적괄용성。연구결과표명，무론시재단면배수환시재쌍면배수조건하，간화해구출적평균고결도총체상시개우현유해화유한단원법이자지간，우기재고결과정적“중후기”（즉고결도≥50%시）。종실용각도래간，간화해적계산결과구유족구정도，차간편、실용；재각충영향인소중，산체재료장장도화장체삼투계수대고결과정적영향최대。
A composite ground with partially penetrated granular columns is turned into a equivalent-double-layered ground on the basis of the general solution of the average degree of consolidation; and its simplifying analytical solution of 1D consolidation is worked out;furthermore, the simplifying formula of the average degree of consolidation is gained. Based on this solution, the present existing solutions and finite element method, these relevant programs are programmed. The consolidation process is investigated and the relevant results are prepared in graph forms which considering the influence of some factors including penetration ratio, permeability coefficient of a granular column, permeability coefficient of disturbed soil and impact factor of disturbed zone. The influence of various factors on the consolidation behavior of composite ground with partially penetrated granular columns is analyzed;and the comparative study of the average consolidation degrees by the three calculation methods is carried out; and then the applicability of the simplifying solution is discussed. The research results show that, the average consolidation degree of the simplifying solution under single-sided drainage or double-sided drainage conditions is between the ones of the existing solutions and the finite element method;and especially in the middle-latter of the consolidation process (≥50%degree of consolidation), the results of the simplifying solution meet the engineering precision requirements;and it is simple, and practical;and in the various influencing factors, both length and permeability coefficient of granular column have the most effects on the consolidation process.
