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首页> 外文会议>Deep Foundations Institute annual conference on Deep Foundations >DEEP MIXING GROUND IMPROVEMENT DESIGN TO SUPPORT LARGE MSE WALLS FOR KITIMAT LNG, BC
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DEEP MIXING GROUND IMPROVEMENT DESIGN TO SUPPORT LARGE MSE WALLS FOR KITIMAT LNG, BC

机译：深混合地面改进设计，可为卑诗省KITIMAT LNG支持大型MSE墙

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An extensive, deep mixing (DM) ground improvement program using the Cutter Soil Mixing (CSM) technique was designed and constructed in 2013 to support up to 20 m (66 ft) high Mechanically Stabilized Earth (MSE) walls and bulk earthworks for the development of the Kitimat Liquefied Natural Gas (LNG) facility at Bish Cove, British Columbia. The deep mixing program consisted of overlapping rectangular panels of in situ cement treated soils, constructed using the CSM technique, to form barrettes covering an area of approximately 12,900 m (15,428 yd~2) and providing suitable static and seismic stability of foundation soils for support of the proposed MSE walls, which would in turn support LNG facilities. The deep mixing program comprised of 1645 CSM panels that were constructed through varying thicknesses and discontinuous layers of very soft fine-grained marine deposits and/or loose sandy silt to silty sand deposits, embedding typically 2 m ( 6.6 ft) into dense silty sand to sand and gravel. CSM panel depths ranged from 5 m (16 ft) to 30 m (98 ft) and were constructed by treating approximately 73,900 m~3 (96,658 yd~3) of soil yielding average unconfined compressive strengths exceeding 2.5MPa (363 psi). This paper outlines the approach adopted for the design of the CSM ground improvement program in the highly variable subsurface conditions present at the site. A phased site-specific investigation consisting of boreholes, test pits, Cone Penetration Tests, piston tube sampling, advanced laboratory testing and groundwater monitoring was implemented. In addition, soil-cement bench scale testing was completed, followed by installation of 8 CSM panels for field trial purposes. Extensive geotechnical static and seismic analyses including Limit Equilibrium stability analyses, liquefaction assessments, and advanced numerical modeling were undertaken to optimize the design and meet the project-specific design performance criteria. The Design-Build team worked closely to develop and implement Quality Assurance and Quality Control plans and managed significant construction challenges while achieving suitable panel termination depths.
机译：2013年，设计并建造了使用刀具土壤混合（CSM）技术进行的广泛的深层混合（DM）地面改良计划，以支持高达20 m（66 ft）的高机械稳定土（MSE）墙和大型土方工程的开发位于不列颠哥伦比亚省比什科夫（Bish Cove）的Kitimat液化天然气（LNG）设施。深层搅拌程序由使用CSM技术构造的原位水泥处理过的土壤的矩形重叠面板组成，以形成覆盖约12,900 m（15,428 yd〜2）的发夹，并为支撑的基础土壤提供适当的静态和地震稳定性拟建的MSE墙中的一部分，这将反过来支持液化天然气设施。深度混合程序由1645个CSM面板组成，这些面板通过变化的厚度和不连续的非常细密的海相沉积物和/或疏松的粉砂淤积层到粉砂沉积物的层构造而成，通常将2 m（6.6 ft）嵌入到稠密的粉砂中。沙子和碎石。 CSM面板的深度范围从5 m（16 ft）到30 m（98 ft），是通过处理大约73,900 m〜3（96,658 yd〜3）的土壤而构造的，其平均无侧限抗压强度超过2.5 MPa（363 psi）。本文概述了现场存在高度变化的地下条件下，CSM地面改善计划设计所采用的方法。实施了分阶段的针对特定地点的调查，包括钻孔，测试坑，锥孔渗透测试，活塞管采样，高级实验室测试和地下水监测。此外，完成了土壤水泥台面规模测试，随后安装了8个CSM面板用于现场试验。进行了广泛的岩土静力和地震分析，包括极限平衡稳定性分析，液化评估和高级数值建模，以优化设计并满足特定项目的设计性能标准。设计-建造团队密切合作，以制定和实施质量保证和质量控制计划，并在实现合适的面板端接深度的同时，应对了重大的施工挑战。

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