Parametric Study Of Anchored Diaphragm Wall For Deep Excavations Using Plaxis 2d

There is a growing need for the construction of underground structures beneathrnbuildings because of the scarcity of available space in Addis Ababa either for parking orrnother purposes. Because of that there is a need for deep excavations duringrnconstruction of the structures, which shall minimize the ground movement caused byrnthe structures to remain within the allowable limits. It’s the geotechnical engineer’srnresponsibility to properly study the soil-structure interaction and soil behavior to designrna support structure which satisfies this requirement in addition to providing a safernworking space. rnThere are many ways to support deep excavations; among which diaphragm walls andrncontiguous piles are the most popular ones in Addis Ababa. There is a need to studyrnthe effect of different parameters prior to the construction for a safer design. Previousrnstudies on anchored diaphragm walls show that the effect of excavation depth, depth ofrnembedment, soil type, strut spacing, and stiffness of the anchored diaphragm wall butrnno consideration is given for the geometric properties of the ground anchor used.rnTherefore, this research presents a study of anchored diaphragm walls using Plaxis 2Drnfor deep foundation support in dry excavation by performing parametric study on thernanchor orientation, anchor length and the grout (geo-grid) length to compare theirrninfluence on the stability of the diaphragm wall. rnAvailable literatures on diaphragm wall had been carefully studied followed by arnnumerical analysis using Plaxis 2D on the representative base models. The comparisonrnof the effect of the parameters are carried out by analyzing the result of the maximumrnhorizontal displacement, vertical displacement, and bending moments induced in therndiaphragm wall using FEM. rnThe results of the parametric studies showed that increasing the anchor orientationrnmore than 25ᴼ isn’t advisable unless the site situation inhibited the installation. It wasrnfound out that free anchor length beyond the assumed wage slip surface should be arnminimum of 1 meter for a safe anchorage. Beyond the assumed wage slip surface, forrnthe same length of anchorage, it was found out that longer free anchor length andrnshorter grout result in a better anchorage than a short free anchor length with longerrngrout for both expansive and red silty clay soil.

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