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中文摘要：
为了探讨圆形地下洞室田岩岩爆破坏过程与机制，以单轴抗爪强度（α）、脆性系数（κ）与冲击能量指数（Ⅵ，R）为概化指标，通过物理模型材料的正交试验，选取合适的具有岩爆倾向性的坚硬脆性岩体物理模型材料，制作了尺寸为800mm×800mm×200mm（长×宽×厚）、中心为φ160mm的圆形洞室物删模型试件，并在岩土工程大型真三轴物理模型试验机上进行平面应变物理模型试验。试验结果表明：在保持物理模型试件水下荷载与垂直荷载相等并同步提高过程中，围岩由弹性状态进入塑性状态，σθ^-（r／ro）曲线表现峰值后移，σr^-（r／r0）曲线形状变化不明显。当对物理模型试件同步施加水甲荷载Ph与垂直荷载Pv，均为600kN时，洞壁出现葱皮状剥落。同步施加水平荷载Ph与乖直荷载Pv，均为630kN时，同岩在极短的时间与极窄的加载区间内围绕涧壁出现大规模突发性破坏，继续同步施加Ph与Pv,在相对较长时间与荷载区间内，围岩应力调整，山现相对稳定期。
英文摘要：
In order to discuss rockburst process and mechanism in the surrounding rock of a circular cavern, a physical model, which is 800 mm long, 800 mm wide and 200 mm thick with a φ160 mm circular cavern, is produced with hard brittle physical model material from orthogonal experiments by the generalized indexes of uniaxial compressive strength（ σc ）, brittleness coefficient（K） and exponential of impact energy（WB ）. The physical model is tested in the large true triaxial model-test machine in geotechnical engineering under the plane strain condition. There are some test results as follows. The peak value of the σθ^-（ r / r0 ） curve moves backwards; and the shape of the σr -（ r / r0 ） curve is not metabolic if the state of the surrounding rock changes from elasticity to plasticity during the process of the horizontal load（ Ph ） and the vertical load（ Pv ） being kept equal and being loaded in phase. On the other hand, flake like shallot skin comes into being in the cavern wall when Ph and Pv loaded in phase are all 600 kN, then large-scale paroxysmal breakage occurs in the surrounding rock during a short time and a limited loading-zone when Ph and Pv loaded in phase are equal to 630 kN. Subsequently, a relatively steady period appears in a relatively long time and a relatively broad loading-zone, following stress adjustability, if Ph and Pv are loaded in phase sequentially.
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