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首页> 外文会议>Western Dredging Association Twenty-Third Technical Conference and Thirty-Fifth Texas Aamp;M Dredging Seminar; Jun 10-13, 2003; Chicago, Illinois >APPLICATION OF A COMBINED DREDGING AND VENEER-CAPPING REMEDY TO SOFT, UNCONSOLIDATED SEDIMENTS
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APPLICATION OF A COMBINED DREDGING AND VENEER-CAPPING REMEDY TO SOFT, UNCONSOLIDATED SEDIMENTS

机译：疏D和单板覆盖相结合的补救措施在软的，非固结沉积物中的应用

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Combined dredging with capping is increasingly being used as a remedial alternative for contaminated sediment sites. Unconsolidated sediments present a unique challenge for remediation. A method of applying successive thin or veneer-lifts as a cap over soft, unconsolidated or disturbed contaminated sediments is gaining increasing use. Combining this method with partial dredging shows promise for the challenges of remedial treatment of soft, unconsolidated sediments. This paper describes a method of combined partial dredging and subaqueous capping remedy performed over soft, thixotropic, sediments. Mocks Pond was a former limestone quarry that was used as a settling basin for primarily lime-stabilized sludge from a wire-manufacturing facility. The sediments are non-consolidated, low organic materials comprised principally of iron and other metal hydroxides, calcium sulfate, and calcium carbonate. The remedial action included removal of approximately 10,000 in-place cubic yards of soft sediments to provide an ultimate clear water depth of 10 feet throughout most of the pond, followed by placement of a 2-foot sand cap. Hydraulically removed sediments were mechanically dewatered and sent off-site for disposal as a non-hazardous waste. The cap design was based on consideration of consolidation, advective and diffusive flux, and scour potential in the 100-year flood plain using methods defined by the U.S. Army Corps of Engineers. Sequencing for cap construction included pre-placement of a geotextile support fabric across the entire pond bottom, application of the sand in discrete, 1.5- to 3-inch lifts, and confirmation sampling to confirm that contract specifications for the cap had been met. Three methods of sand placement were used, including a spreader barge with pipeline assembly, a high-pressure spray system in shallow water areas, and a bulldozer for areas along a rock shelf in < 24 inches of water. Over the 2.8 acres, 12,000 tons of sand were successfully placed.
机译：疏dr与封盖相结合的方法正越来越多地用作污染泥沙场的补救措施。未固结的沉积物提出了独特的修复挑战。在软的，未固结的或扰动的受污染的沉积物上施加连续的薄或单板抬升作为顶盖的方法正在得到越来越多的使用。将该方法与部分疏dr相结合，显示出对软性，未固结沉积物进行补救处理的挑战。本文介绍了一种在软性，触变性沉积物上进行部分疏partial和水下封堵补救措施相结合的方法。 Mocks Pond以前是一个石灰石采石场，曾被用作沉淀池，主要用于生产线材的石灰稳定污泥。沉积物是非固结的低有机物质，主要由铁和其他金属氢氧化物，硫酸钙和碳酸钙组成。补救措施包括清除大约10,000个就地立方码的软沉积物，以在整个池塘的大部分区域提供10英尺的最终清澈水深，然后放置一个2英尺的沙帽。将水力去除的沉积物进行机械脱水，然后作为非危险废物运至异地处置。使用美国陆军工程兵团定义的方法，根据100年洪泛区的固结，对流和扩散通量以及冲刷潜力的考虑来设计瓶盖。瓶盖施工的顺序包括在整个池塘底部预先放置土工布支撑织物，在1.5到3英寸的不连续升降机中使用沙子，以及确认采样以确认是否满足瓶盖的合同规格。使用了三种沙子放置方法，包括带有管道组件的散布驳船，浅水区域的高压喷雾系统，以及在水深小于24英寸的岩石架子区域的推土机。在2.8英亩的土地上，成功放置了12,000吨沙子。

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