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深埋球形洞室围岩分区破裂化机理

ISSN号：1000-4750
期刊名称：《工程力学》
时间：0
分类：TU452[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]重庆大学土木工程学院,重庆400045, [2]解放军理工大学,南京210007
相关基金：国家自然科学基金项目（50490275,50778184）,教育部新世纪优秀人才支持计划项目（NCET-07-0911）

关键词：球形巷道, 深部岩体工程, 分区破裂化, 深部岩体强度准则, 动力问题, spherical tunnel, deep rock mass engineering, the alternative occurrence of fractured zone andnon-fractured zone, strength criterion of deep rock masses, dynamic problem

中文摘要：

在高应力和复杂的地质环境中，深部球形洞室围岩在开挖扰动下会出现破裂区和非破裂区交替出现的分区破裂化现象，研究分区破裂化现象可以深化深部岩体的力学性能研究，同时对深埋洞室的开挖和支护设计提供理论基础。该文研究的深部球形洞室外部受到静水压力的作用，洞室内壁受到一个随时间变化的开挖荷载的作用，其运动方程用位移势函数来表示。通过Laplace变换简化计算，获得势函数的通解，从而获得了在开挖扰动下洞室围岩的应力场和位移场。当围岩应力场满足深部岩体强度准则时，岩体破裂，从而产生变形局部化。岩体破坏产生的应力重分布可能导致新的围岩破坏，从而产生二次破裂区；以此类推，直到应力释放后不能产生破裂区为止。根据断裂力学确定破裂区的残余强度，并确定破裂区和非破裂区的宽度和数量。破裂区的形成受到岩体力学性能、洞室开挖方式和速度等较大的影响。

英文摘要：

High stress, high temperature and complicated environment are encountered in deep geology. The mechanical behavior of the deep rock mass is different from that of shallow rock mass. In shallow rock mass engineering, the excavation-affected rock around tunnel contains a loose zone, a plastic zone and an elastic zone. /n deep rock mass engineering, the surrounding rock mass around spherical tunnels is divided into fractured zone and non-fractured zone, which occurs alternatively. The mechanism of the zonal disintegration phenomenon around deep spherical tunnels is analyzed. The present model is helpful to understand the failure and deformation of the deep rock mass. The present theory model contains a spherical tunnel which is subjected to an in-situ far-field hydrostatic stress and a changing internal pressure during tunnel excavation. The dynamic problem can be expressed by displacement potential function and the general solution of motion equations can be obtained by using Laplace transform. The stress and displacement field around spherical opening are obtained. The fractured zone in the surrounding rock mass around deep spherical tunnel can be determined by using the deep rock mass strength criterion. Size and quantity of fractured zone and non-fractured zone in the surrounding rock mass around deep spherical tunnel are given. The stress field in the fractured zone is obtained based on the theory of deformation localization. The influencing factors of the zonal disintegration phenomenon include the mechanical properties, excavation method and the excavation velocity, etc.

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