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针对静载试验中锚桩形式对单桩极限承载力的影响规律,采用荷载增量法,运用有限元软件计算分析锚桩不同布置方式和不同设计形式下的受力情况,并与现场试验进行对比分析。计算结果表明:常见的“四锚一”布置方案优于“二锚一”布置方案;当锚桩与试桩中心距小于三倍桩径时,锚桩上拔对试桩桩顶沉降影响较大,当锚桩与试桩中心距大于等于四倍桩径时,锚桩上拔对试桩沉降影响很小;当锚桩与试桩中心距较小时,随着锚桩桩径的增大,所测得的试桩极限承载力偏大,当锚桩与试桩的中心距大于6倍试桩桩径时,锚桩桩径变化对试桩极限承载力产生的影响可忽略不计。
Aiming at the influence law of the form of anchor pile on the ultimate bearing capacity of single pile in static load test, the load increment method is adopted to analyze and analyze the force under different layout and different design styles of anchor pile by means of finite element software. Comparative analysis. The calculation results show that the common “four anchor one” arrangement scheme is better than the “two anchor one” arrangement scheme. When the center distance between anchor pile and test pile is less than three times of pile diameter, When the center distance between anchor and test piles is greater than or equal to four times the diameter of pile, the effect of anchor pile on the test pile settlement is very small. When the center distance between anchor and test piles is small, When the distance between the anchor and test piles is greater than 6 times the test pile diameter, the influence of the pile diameter on the ultimate bearing capacity of the test piles may be affected can be ignored.