Prediction of ground settlements have always been a big challenge for the engineers that are responsible for the design of subway tunnel projects. Since ground settlement is a crucial concept directly affecting the successfulness of a project, it must be taken seriously and should be accurately estimated. Consolidation settlements in the close proximity of Ulus-Ke&ccedil / i&ouml / ren Subway project due to groundwater drainage is the focus of this study. In this sense, the necessary data about the project characteristics and the site conditions were collected thru project descriptions and the geotechnical investigations conducted at the project site. Utilizing the generated database analytical calculations were carried out to predict the settlements. Upon completion of this stage of analysis several of the locations were numerically modeled for further investigation. Numerical analysis was conducted at four sections by using Plaxis, to determine the amount of expected displacements and the resulting groundwater situation. Despite of the differences between these two methods the resulting settlement estimations displayed consistency.

The Lost River Groundwater Drainage Basin in Warren County, Kentucky, is a karst drainage system encompassing 55 square miles (143 square kilometers) developed within the Mississippian St. Louis and Ste. Genevieve Limestones. Near the contact between these two formations are two bedded chert units, the Lost River Chert Bed (Elrod, 1899) within the Ste. Genevieve and the Corydon Chert Member (Woodson, 1983) of the St. Louis, which appear to be perching layers to shallow karst groundwater flow. Groundwater may be seen flowing on top of these beds in various cave streams and at swallets and springs throughout the basin. In order to compare the vertical positions of these layers to shallow karst groundwater flow, geologic structure maps of the Lost River Chert Bed and the Corydon Chert Member were prepared for the basin, along with a contour map of the water table (at or near which shallow karst groundwater flow is assumed to take place) over the same area. These surfaces were digitized, then contoured and compared using SURFACE II and DISSPLA computer graphics systems. Correlation was accepted for points where the water table is either 20 feet (6.1 meters above or below the top of the two chert layers. The water table (at baseflow conditions) was found to correlate with the Lost River Chert Bed over 42.6% of the basin, as well as 40.7% for the Corydon Member. Shallow karst groundwater flow is found to correlated with bedded chert layers over 83.3% of the study area, and therefore it is concluded that chert layers have a dominant effect on the vertical position of groundwater flow within the Lost River Groundwater Drainage Basin.

Denna rapport grundar sig i en genomgång av ett antal tunnelanläggningars ansökningar till Mark- och miljödomstolen vid Nacka Tingsrätt gällande bortledning av grundvatten, samt deras slutgiltiga domstolsbeslut i Stockholmsområdet. Syftet med denna studie är att undersöka vilka faktorer i ansökan som domstolen lägger störst vikt vid inför domstolsbeslutet, samt hitta eventuella likheter eller skillnader mellan de fyra olika tunnelanläggningarna som beaktats. Vidare undersöks anledningarna bakom uppdelningen av en tunnel i olika delsträckor och hur dessa i sin tur påverkar de inläckagenivåer som ansökan yrkar på. Rapporten behandlar följande tunnelanläggningar: Nya Avloppstunneln, E4 Förbifart Stockholm, City Link etapp 2 samt Nya Tunnelbanan. Sammanfattningsvis blev resultatet av denna studie följande: de olika domstolsbesluten tar alla hänsyn till ungefär samma faktorer där yttranden från Länsstyrelsen och genomförandet av fältundersökningar anses betydande. Tunnelsträckornas indelning baseras på de olika geologiska förhållandena i området samt vart vattendelare och inströmningsområden är lokaliserade. Slutligen är det även tydligt att domstolen tar hänsyn till tidigare projekts domstolsbeslut, både gällande de inläckagevillkor som beviljas samt den tekniska lösningens utformning. / The following report analyses a number of tunnel-constructions applications to the Land and Environmental Court (Mark- och miljödomstolen), at Nacka district court in Stockholm regarding groundwater drainage. The study also covers the court decisions for each of the tunnel-constructions. The purpose of this study is to find common denominators in the court decisions in order to draw conclusions about which denominators are of more importance than others, when the court makes its final decision. Furthermore, the study also aims to find clarity in the decision-making behind the division of the tunnel into sections and how those impact the levels of groundwater-leakage requested in the application. The following tunnel- constructions have been analysed: Nya Avloppstunneln, E4 Förbifart Stockholm, City Link etapp 2 as well as Nya Tunnelbanan. The result showed that the different court decisions all regard some factors more important than others, where the claimant from the supervisory authority Country Administrative Board (Länsstyrelsen) and the implementation of field studies are deemed two of the most important factors. The division of the tunnels is based on the geological prerequisites and the location of the watersheds and inflow areas. Lastly, it is also clear that the court takes previous projects court decisions into account regarding the leakage-levels as well as the technical solution.