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首页> 外文会议>Deep Foundations Institute Annual Conference on Deep Foundations; 20050922-24; Chicago,IL(US) >FULL-SCALE O-CELL LOAD TEST FOR A ROTATOR DRILLED ROCK SOCKET AT THE MAIN SPAN OF THE NEW BENICIA-MARTINEZ BRIDGE
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FULL-SCALE O-CELL LOAD TEST FOR A ROTATOR DRILLED ROCK SOCKET AT THE MAIN SPAN OF THE NEW BENICIA-MARTINEZ BRIDGE

机译：新BENICIA-MARTINEZ桥主桥上的旋转凿岩船坞的全尺寸O池载荷测试

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摘要

Due to implementation of the rotator construction method from which a smooth shaft was anticipated, a full-scale pile load test (Osterberg Method) was performed at Pier 14 Pile 9 of the main span of the New Benicia-Martinez Bridge to confirm the design parameters of the rock sockets. Two levels of load cells were fabricated in the reinforced cage of the rock socket. Each level consisted of three 670-mm Osterberg load cells with a total testing capacity of more than 50 MN in both directions. In an attempt to separate side friction and end bearing, a 75 mm thick compressible Styrofoam material was placed at the bottom of the cage. The pile load test was carried out in four stages. The multi-level multistage pile load test data was interpreted for casing friction, side friction for two rock strata, end bearing, and residual side shear values under repeated loading in opposite directions. The side friction from the casing in soils at Stage 2 is approximately 9 MN. The end bearing at the tip of the rock socket at Stage 3 was calculated to be approximately 17 MN at a displacement of about 75 mm. The residual side shear resistance for the 10 m 50% RQD rock strata was calculated to be 9 MN or approximately 50% of initial values, after being pushed 0.3 mm upward in Stage 1, 71 mm downward in Stage 2, then 55.5 mm upward again in Stage 3, and finally 105.3 mm downward in Stage 4. The test results surprisingly indicate that the side shear resistances from both low RQD intensely weathered rock and higher RQD slightly weathered competent rock are about the same at approximately 19 MN. This pile load test provides very critical information for confirming deep shaft design and analyses.
机译：由于采用了可以预测光滑轴的旋转器施工方法，因此在新贝尼西亚-马丁内斯大桥主跨的14号墩9号墩上进行了全面的桩载荷试验（奥斯特伯格法），以确认设计参数的岩石窝。在岩石承窝的加强笼中制造了两层称重传感器。每个级别由三个670毫米的Osterberg称重传感器组成，两个方向的总测试能力均超过50 MN。为了分离侧面摩擦和端部轴承，将75毫米厚的可压缩聚苯乙烯泡沫塑料材料放在保持架的底部。桩载荷试验分四个阶段进行。解释了多级多级桩荷载测试数据，包括套管摩擦力，两个岩层的侧向摩擦力，端承和在相反方向反复荷载下的残余侧向剪切力值。在第2阶段，土壤中来自套管的侧向摩擦约为9 MN。在第3阶段，在岩石承窝末端的端部轴承经计算约为17 MN，位移约为75 mm。在第1阶段向上推0.3 mm，在第2阶段向下推71 mm，然后再次向上55.5 mm之后，计算出10 m 50％RQD岩层的残余侧剪切阻力为9 MN或约为初始值的50％。在阶段3中，最后在阶段4中向下105.3 mm。测试结果出乎意料地表明，低RQD强风化岩石和较高RQD轻度风化岩石的侧向剪切阻力在大约19 MN处大致相同。该桩载荷测试为确认深井设计和分析提供了非常关键的信息。

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