Shear Wave Velocity Measurements During Ground Improvement at a Municipal Solid Waste Landfill Site in South Carolina

作者：Clifford Astill castill@nsf.gov注意日期： 1998年5月5日12：15 PM优先级：正常TO：acoles at nsf 18主题：摘要：CMS-9813564，Edward Kavazanjian，GeoSyntec咨询-摘要：CMS-9813564，Edward Kavazanjian，GeoSyntec Consultants 该项目的目的是收集有关地震的重要数据， 城市固体废物的处理和地面改善，以加强 通过爆破使砂土密实而抗液化。一个独特 存在通过剪切同时实现这些目标的机会 在爆炸引起的地面改进试验期间的波速测量 位于美国南部多切斯特县的橡树岭卫生填埋场的项目 卡罗莱纳。 通过地面监测，测量了固体废弃物中的剪切波速 运动引起的测试爆炸，而剪切波速度的 在爆破前和爆破后使用十字孔测量改良的地面， 井下测试这些固体废物的剪切波速度测量 以及爆破前后的地下情况将提供有价值的信息 这些材料的动态行为，并可能确定重要的 这一现象值得进一步研究。 关于城市固体废物剪切波速度的信息有限 在南加州垃圾填埋场获得的数据，但它是基础， 美国垃圾填埋场地震反应的评价 States.在相对潮湿的橡树岭固体废物剪切波速度 与干旱的南加州垃圾填埋场不同的垃圾填埋场将 提供废物特性区域差异的证据。这些 潜在的差异可能会对抗震设计产生重大影响， 加州南部的垃圾填埋场。 一个动力固结地基处理项目的最新数据表明， 用常规的方法高估了诱导致密化， 渗透测试由于横向应力的增加。剪切波速 爆破前后的测量可以提供重要的检查， 锥形电阻计电阻作为改进措施的有效性， 并且可以提供更直接和成本有效的验证手段 改善，并可以提供重要的见解， 改进. +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ Clifford J. Astill Ph：703-306-1362; X5083传真：703-306-0291 castill@nsf.gov www.eng.nsf.gov/cms/castill.htm国家科学基金会 4201 Wilson Blvd.，RM545 阿灵顿，弗吉尼亚州22230

Author: Clifford Astill castill@nsf.gov at NOTE Date: 5/5/98 12:15 PM Priority: Normal TO: acoles at nsf18 Subject: Abstract: CMS-9813564, Edward Kavazanjian, GeoSyntec Consult ------------------------------- Message Contents ------------------------------- Abstract: CMS-9813564, Edward Kavazanjian, GeoSyntec Consultants The objective of this project is to collect important data on the seismic response of municipal solid waste and on ground improvement to enhance liquefaction resistance through densification of sand by blasting. A unique opportunity exists to achieve these objectives simultaneously through shear wave velocity measurements during a blast-induced ground improvement pilot program at the Oakridge Sanitary Landfill in Dorchester County, South Carolina. Shear wave velocity in the solid waste is measured by monitoring ground motions induced by the test blasts, while shear wave velocity of the improved ground is measured before and after blasting using crosshole and downhole testing. These shear wave velocity measurements on the solid waste and in the ground before and after blasting will provide valuable insight into the dynamic behavior of these materials, and may identify important phenomenon that merit further investigation. Information on the shear wave velocity of municipal solid waste is limited to data obtained in southern California landfills, yet it is the basis for evaluation of the seismic response of landfills throughout the United States. Solid waste shear wave velocities at the relatively wet Oakridge Landfill that differ from those at arid southern California landfills would provide evidence of regional differences in waste properties. These potential differences could have a major impact on the seismic design of landfills outside of southern California. Recent data from a dynamic-consolidation ground-improvement project show that the induced densification was overestimated using conventional penetration testing due to increases in lateral stress. Shear wave velocity measurements before and after blasting can provide an important check on the validity of cone penetrometer resistance as a measure of improvement, and may provide a more immediate and cost-effective means of verifying improvement, and can provide important insights into the mechanisms of improvement. +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+ Clifford J. Astill Ph:703-306-1362; X5083 Fax:703-306-0291 castill@nsf.gov www.eng.nsf.gov/cms/castill.htm Nat'l Science Fdn 4201 Wilson Blvd., Rm545 Arlington, VA 22230