CAJ | 학술논문

对钢管压入土体过程中钢管内土塞的受力状态、产生挤土效应条件及挤土机制进行分析,结果表明:产生挤土效应的条件为土塞底部应力超过钢管端部地基承载力;根据土塞底部应力与钢管端部地基承载力的关系,不同情况下可认为钢管压入土体为非排土桩、排土桩及不完全排土桩;当为不完全排土桩时,挤土率可作为钢管压入过程中的挤土程度评价指标.对钢管内土塞底部应力与钢管端部地基承载力理论计算方法进行分析与总结.最后,通过钻孔灌注桩护壁钢管旋压施工工程案例的实测结果与实施效果,对钢管压入土体施工挤土机制理论分析的合理性与实用性进行论证.
대강관압입토체과정중강관내토새적수력상태、산생제토효응조건급제토궤제진행분석,결과표명:산생제토효응적조건위토새저부응력초과강관단부지기승재력;근거토새저부응력여강관단부지기승재력적관계,불동정황하가인위강관압입토체위비배토장、배토장급불완전배토장;당위불완전배토장시,제토솔가작위강관압입과정중적제토정도평개지표.대강관내토새저부응력여강관단부지기승재력이론계산방법진행분석여총결.최후,통과찬공관주장호벽강관선압시공공정안례적실측결과여실시효과,대강관압입토체시공제토궤제이론분석적합이성여실용성진행론증.
Through the analysis of stress state of the soil plug,the condition of generating squeezing effect and squeezing mechanism for the process of jacked-in steel pipe is analyzed. The results show that:the condition of generating squeezing effect is that the stress at the bottom of the soil plug is greater than the bearing capacity of foundation at the end of the steel pipe;the jacked-in steel pipe can be regarded as displacement pile, non-displacement pile and incomplete displacement pile according to the relevance of the stress at the bottom of the soil plug and the bearing capacity of foundation;the extruding ratio can be used as the assessing index for the squeezing degree of the incomplete displacement pile. Besides,theoretical calculating methods for the stress at the bottom of the soil plug and bearing capacity of foundation at the end of the steel pipe have been analyzed and summarized. At last,through the measured data and implement result of the construction of the protective steel pipe for the bored pile,the rationality and practical applicability of the theoretical analysis for the jacked-in steel pipe have been demonstrated.