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首页> 外文会议>Deep Foundations Institute annual conference on deep foundations >BORED PILE CONSTRUCTION CHALLENGES IN HIGHLY VARIABLE LIMESTONE FOR A SUPERTALL BUILDING
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BORED PILE CONSTRUCTION CHALLENGES IN HIGHLY VARIABLE LIMESTONE FOR A SUPERTALL BUILDING

机译：高层建筑在高度可变的石灰岩中的钻孔桩施工挑战

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This paper presents a case study on bored pile construction in challenging karst conditions below a supertall building in Kuala Lumpur. Innovative design and construction techniques helped keep the project moving through very difficult and unpredictable geological and drilling conditions. The development encompasses about 12,400 square meters and includes a 77-story tower, a 59-story tower, a five-story podium, and four contiguous basement levels. The site is underlain by a residual soil derived from a siltstone/claystone (the Kenny Hill formation), then limestone bedrock. Subsurface conditions are relatively uniform within the Kenny Hill and highly variable at the limestone surface. Extreme cases included 40-meter-tall underground caverns, 40-meter-tall pinnacles, and a 50-meter-tall underground rock ledge. Local piling practice in Kuala Lumpur involves deriving pile capacity entirely in the Kenny Hill formation to avoid the unpredictable limestone surface. However, the massive tower foundation loads and relatively shallow bedrock required the piles to be socketed in the limestone. The 77-story tower will be supported by 2.0- and 2.2-meter-diameter bored piles 50 to 100+ meters long, socketed in limestone, with working loads between 40 and 70 Meganewtons. Two Osterberg-cell load tests were used to develop a site-specific rock socket skin friction correlation with RQD. Exploratory rock probes were drilled at each pile location to design the rock socket length based on the rock quality and sloping rock conditions. The rock mass was pressure-grouted during each rock probe to improve the rock quality and fill voids in the rock.
机译：本文介绍了在吉隆坡超高层建筑下面具有挑战性的岩溶条件下钻孔桩施工的案例研究。创新的设计和施工技术有助于使该项目在非常困难且不可预测的地质和钻探条件下运行。该开发项目占地约12,400平方米，包括77层塔楼，59层塔楼，5层裙楼和四个连续地下层。该地点被粉砂岩/粘土岩（肯尼山地层）和石灰岩基岩的残留土壤所覆盖。在肯尼山，地下条件相对均匀，而在石灰岩表面则变化很大。极端情况包括40米高的地下洞穴，40米高的尖峰和50米高的地下岩石壁架。吉隆坡当地的打桩实践涉及完全在肯尼山地层中推导桩的能力，以避免不可预测的石灰石表面。但是，巨大的塔基础负载和相对较浅的基岩要求将桩套入石灰岩中。这座77层高的塔楼将由直径为50至100+米的2.0和2.2米长的钻孔桩支撑，并用石灰石承插，工作载荷在40至70兆牛顿之间。使用两个Osterberg单元载荷测试来开发与RQD特定位置的岩石承窝皮肤摩擦相关性。在每个桩位置钻探性探岩器，以根据岩石质量和倾斜岩石条件设计岩槽长度。在每个岩石探查器中对岩体进行压力灌浆，以改善岩石质量并填充岩石中的空隙。

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