岩土体水平孔内力学参数检测装置及检测理论-《建筑科学与工程学报》

文章信息/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

摘要:: 为了能在隧道掌子面或基坑侧壁上直接进行岩土体力学参数的测量，提出了一种在岩土体内沿水平方向钻孔测量其力学参数的原位测试方法，研制了其配套装置，从而避免从地面打孔进行土体力学参数测量的繁琐工序，并对该装置的设计思想和使用方法做了明确具体的介绍。针对该装置的不等压扩孔问题，采用弹性力学的方法给出了该装置测量岩土体力学参数的解析理论依据，并利用数值方法对解析理论做了验证。采用数值模拟方法研究了弹性模型、摩尔-库仑模型下多组参数的检测结果。结果表明：该装置的弹性解析理论在较大粘聚力、内摩擦角的岩土体中的检测结果是准确的。该装置可以随理论研究的不断加深而得到广泛的应用。

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.