高陡边坡桥基安全距离研究

研究目的:高陡边坡桥基位置的确定不仅关系到高边坡的稳定和桥梁的安全,也直接关系到整个桥梁的技术指标和造价。而目前相应的规范及手册中,对高陡边坡桥基位置没有明确的规定。研究方法:荷载作用下高陡边坡岩体力学行为特征是桥基位置确定的基础。利用数值分析方法,分析不同边坡几何状态下荷载对边坡岩体应力的影响。研究结果:根据荷载作用下边坡岩体应力影响范围的变化特征,提出高陡边坡桥基安全距离的确定原则。边坡岩体应力影响范围主要与荷载强度、桥基宽度、边坡坡度以及桥基水平距离等因素有关。根据坡面岩体应力影响系数最大值与各影响因素的关系,再利用岩体质量对应力影响系数进行限定,提出高陡边坡桥基安全距离的确定公式。研究结论:工程实践表明,用本文方法来确定高陡边坡桥基位置是方便的、适用的。

Research on the Safe Bridge Foundation Position on High Steep Slope

Research purposes: The bridge foundation position on high-steep slope has great effect on stability of slope and bridge, it also affects the technical index and cost of bridge. The bridge foundation position on high-steep slope is not specified definitely in current corresponding norms or hand books. Research methods:The mechanical behavior characteristics of rock mass of slope under load are the basis of bridge foundation position determining. In this paper, the influences of load on rock mass stress in different geometric conditions of slope are analyzed with numerical method. Research results:According to the change characteristics of influence range of rock mass stress under load, a principle of determining safe bridge foundation position on high steep slope is put forward. The stress influence range of rock mass slope is mainly related with load intensity, bride foundation width, slope angle, bridge foundation position. According to the relations between the maximum influence coefficients of rock mass stress on sloping surface and each influencing factor , a formula determining safe bridge foundation position on high steep slope is put forward at last when the influence coefficient of rock mass stress is limited by rock mass quantity. Research conclusions:Engineering practice shows the method of determining bridge foundation on high-steep slope in this paper is convenient and applicable.