非粘土地基中灌注桩超载受压后的承载性状  

Bearing Behaviour of Bored Piles after Surcharge Precompression

作　　者：楼晓明[1] 刁惠荣 

机构地区：[1]同济大学地下建筑与工程系,华中房地产开发公司

出　　处：《工程勘察》1999年第1期17-19,23,共4页Geotechnical Investigation & Surveying

摘　　要：对数根达到极限状态后的钻孔灌注桩进行了第２次静载试验，发现前后两次试验Ｑ～ｓ曲线的拐点发生明显的变化，第２次试验的拐点接近于第１次试验的最大加载量Ｑｍａｘ，单桩极限承载力有了较大提高，但试桩初始静刚度的变化很小，其原因主要是由前一次超载预压引起的，而加载方法及时间间隔影响并不大。Static load tests were conducted on several bored piles for the second time as ultimate states were reached.It is found that the load at inflexion point of the second Q-s curve is close to the maximum load Q max of the first test.The ultimate bearing capacity of pile is enhanced obviously but the initial static rigidity of the test piles are nearly unchanged which are induced mainly by surcharge precompression in the previous time.The impacts of loading method and time interval are inconsiderable.

关 键 词：超载预压 极限承载力 静载试验 灌注桩 

分 类 号：TU413.4[建筑科学—岩土工程] TU473.14[建筑科学—土工工程]