PROPOSED EMPIRICAL METHOD FOR DETERMINING STABILITY CRITERION OF COASTAL BANK PROTECTION ON SOFT GROUND USING MATTRESS AND BAMBOO CLUSTER PILE
Suyuti, Mufti A. Sultan, Zulkarnain K. Misbah

Khairun University
Ternate, North Maluku
Indonesia.


Abstract

Many low lands are deeply covered by deposite soft ground down depth 30 meters in Indonesia. These areas are often given soil consistency with soil cohesion cu less than 15 kPa in along of river or seashore. Indonesian people and local goverenment have a custom to stay and construct infrastructure on the area of soft ground aforementioned. In oder to protect the natural disaster by big waves from the coastal, the local government has to construct a robust bank for safety of living. However, these areas are very weak bearing capacity due to its subsoil stiffness problem. Ministry of Public Works has published several guidelines for soil embankment on soft ground [MPW., 1999; 2015]. These guidelines were reported the construction process for road and its must be conducted trial construction in field, which employed a commercial package to simulate the design stability, it is not for construction of coastal bank. This problem is solved by following the proposal of construction process for coastal bank included such as: 1. Cutting ground and preparating area of mattress, 2. Putting the bamboo stems as the mattress, 3. Laying geo-bamboo, 4. Constructing coastal bank. Therefore, this study is to propose an empirical method, the bearing capacity of bamboo mattress on soft soil was modelled in full scale test. Several layers of bamboo stems were provided to simulate the criterion of stability of the bank based on rule of geotechnics. Finally, the stability criterion such as bearing capacity, factor of safety and allowable hight for the coastal bank were presented

Keywords: empirical method, design criterion, coastal bank, soft ground, mattress bamboo

Topic: Infrastructure and Environment

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