Design, Manufacture, and Perform of First Electronic Seismic Sensor Dilatometer in Project of Tehran Metro line ۶ as a Rapid Environmentally Friendly in-situ Test with Less Soil Disturbance

The soil's physical and mechanical properties are obtained through laboratory or in-situ tests. The dilatometer is an in-situ tool in rock mechanics and geotechnical engineering, and is widely used in developed countries. In the advanced version of this device, a geophone receives ground vibration. Thus Vs [۱] could be obtained at the depth of the blade. This research work investigates the feasibility and performance of the first electronic seismic sensor due to its lower cost, more life span, more sensitivity instead of the geophone, and the ability to transfer signal. These changes make it an online tool connected to Arduino[۲], a platform so the digital or analog result could be transferred automatically. The test is carried out under construction of Bahar Shiraz station of Tehran Metro Line ۶ at the depth of ۳۰ m. The hammer generates a shear wave, and after amplification, the received signals are measured with the software. The shear wave velocity at the test site is obtained at ۵۰۴ m/s. The result compared to Vs reported geotechnical investigation done by “Darya-Khak-Pey consulting engineers” for Metro line ۶ shows a ۱۰% deviation. It is suggested to conduct more comparative tests to check the results and calibrate. Using an ۸۰۱-S sensor with more life span (of more than ۶۰ million times) and the ability to connect to the internet with an Arduino board is the innovation applied to introduce a new generation of this tool in the engineering world.

کلیدواژه ها:

in-situ ، rock mechanics ، geotechnics ، Dilatometer ، Seismic