隧道洞口碎石土堆积边坡稳定性研究

Research on Slope Stability Based on Gravel-Soil Accumulation at Tunnel Entrance

碎石土堆积体边坡稳定性给隧道正常施工、运营带来较大安全隐患,为能够更好解决隧道洞口碎石土堆积体边坡稳定性问题,以雪山梁隧道为研究对象,对隧道洞口主要碎石堆组成部分的石英岩稳定性进行试验研究;利用单轴压缩与三轴压缩试验,获得石英岩(碎石土堆积体)的物理参数,同时采用折线滑动法与萨尔马法两种计算方法对其边坡自然与饱和两种状态下安全系数进行计算。计算结果表明,自然状态下雪山梁隧道工程B标段工程洞口碎石堆边坡处于稳定状态,而饱和状态下其稳定性欠佳。

The stability of the gravel-soil accumulation slope brings greater safety hazards to the normal construction and operation of the tunnel.In order to better solve the problem of the stability of the gravel-soil accumulation slope at the tunnel entrance,the Xueshanliang Tunnel is taken as the research object to conduct experimental research on the stability performance of the quartzite of the main gravel pile at the entrance of the tunnel;the uniaxial compression and triaxial compression experiments are used to obtain the physical parameters of quartzite(the gravel-soil accumulation).Meanwhile,the two calculation methods of the broken-line sliding method and the Salma method are adopted to calculate the safety factors of the slope in both natural and saturated states.The calculation results show that the gravel-soil accumulation slope at the entrance of B bidding section of the Xueshanliang Tunnel Project is in a stable state in natural state,but its stability is lacking in the saturated state.