Abstract

Info

Title:: Measured Device and Theory of Mechanical Parameters in Horizontal Cavity of Rock and Soil

Author(s):: HUANG Ming-li; LI Ning; Tunnel and Underground Engineering Research Center of Ministry of Education, Beijing Jiaotong University

Keywords:: ock and soil; horizontal cavity; in-situ test; mechanical parameter; in-isotonic cavity expansion; analytic theory

Abstract:: In order to get the mechanical parameters of rock and soil just only on the surface of tunnels and foundation pits, a new in-situ test method for measuring its mechanical parameters along horizontal cavity direction which was used in rock and soil was put forward, and a device supporting this method was also researched and designed. So, this would avoid the inconvenient working procedure of punching from ground surface to tunnel’s face. The design cogitation and the manipulation method of the device were also definitely and concretely introduced. The essence of this method was in-isotonic cavity expansion problem. For this problem, using the method of elasticity, analytic theory of testing the elastic parameters of rock and soil by this device was given, and there was also a numerical testify for this analytic theory. Finally, this test method was simulated by numerical method, which involved several groups of parameters of elastic model and MohrCoulomb model. The results show that the elastic analytic theory can be used in the rock and soil with high values of cohesive force and internal friction angle. This device can be used in a wider place along with the development of theoretical research.