SR 202, Section 405 HWY Stabilization Project Sinkhole Remediation by Compaction Grouting King of Prussia, Pennsylvania Back to Project List Limited Mobility Grouting Compaction grouting is used to stabilize karstic geology soils at a railroad bridge abutment in King of Prussia, PA. Project Overview: Layne GeoConstruction was contracted to stabilize the karst geology below a new highway interchange by injecting a low slump grout mixture. The karst limestone underlying the area is prone to sink holes and compaction grouting was utilized to fill the solution features in the rock and consolidate the overlying soft soils. Layne's work was part of a multiphase project to upgrade the existing interchanges of State Route 202 with State Route 422 and Interstate 76. In total, 28,500 linear feet of grout holes were drilled and 2,500 yards of compaction grout was placed. One segment of the project involved grouting of the upper zone of the underlying bedrock under a new railroad bridge. Layne drilled over 325 holes at three footings to a depth of 10 foot into rock and grouted the rock portion of the hole. The grouting was necessary to stabilize possible solution features of the upper rock zone. This created a solid block for the H-pile foundation system to support the heavily loaded bridge abutments.     Value of Work Performed: $1,800,000 Project Duration: 12 Working Months Project Completion Date: March 2003 Project Reference: General Contractor Allan A. Myers, Inc. Gerard Maurer (610) 584-3489