The study aims to know some of the physical and mechanical properties of limestone rocks within the Pila Spi and Sinjar Formations at the southwestern limb of Bazian Fold within the Sulaymaniyah Governorate, in order to show their suitability as riprap stones. The tests showed that the values ​​of the dry density of these rocks ranged between (1.857-2.341) g/cm³, the water absorption rate ranged from (1.848-9.87)%, and the specific weight ranged from (2.167-2.255), and the values ​​of the chemical erosion ratio ranged between (8.9-29)%. After knowing the physical and mechanical properties of these limestone rocks and comparing them with the standard specifications of the riprap stones, it was found that these rocks are not suitable for riprap purposes in all the stations of the study area most of the stations of the study area.

The research aims to find the suitability of limestone rocks belonging to the Sinjar and Pila Spi Formations in the southwestern part of the Bazian fold in Sulaymaniyah Governorate for building purposes and as a railway ballast stone by conducting some important geotechnical laboratory tests and comparing them with the required standard specifications for building stones and railway ballast stone. Through these tests, it was found that the values ​​of the dry density of the studied samples ranged from (1.87-2.31) (g/cm³), while the values ​​of the water absorption coefficient ranged from (1.84-9.87)%, and the specific weight values ​​ranged from (2.16-2.25), while the values ​​of The unconfined compressive strength ranged between (31-55) MPa in its natural state, and the Flexural strength values ​​ranged from (5.5-11.9) MPa, and the mechanical abrasion percentage values ​​ranged between (24.4%-61.6%). After comparing the values of these properties with the specifications required for building stones and the specifications required for railway ballast stones, it was found that the limestone rocks in the study area are suitable for building purposes, but they are not valid as a railway ballast stone.