特高压线路工程中基础在强风化岩石下的优化选型

Optimal Design of Foundation under Condition of Highly Weathered Rock for UHV Transmission Lines

针对±800 k V特高压直流输电线路工程的特点,对比分析了挖孔基础和岩石嵌固基础在强风化及表层有覆盖层的强风化的地质条件下的适用性。分析结果表明,在无覆盖层的强风化岩石地质条件下,应采用挖孔基础或岩石嵌固基础,建议根据岩体的风化及完整性综合考虑;对于有覆盖层的强风化岩石地质条件下的基础选型,应优先采用挖孔基础。同时运用ANSYS模拟分析了挖孔基础在有一定厚度覆盖层的强风化地质条件下的受力机理,分析表明挖孔基础在水平力作用下呈现弯曲特性。

Based on the characteristics of ± 800kV UHV DC transmission lines this paper studies and compares theadaptability of excavated pile foundation and rock embedded foundation in highly weathered rock without and with overburdenlayer. The results show that the excavated pile foundation or the rock embedded foundation is allowed in highly weathered rockwithout overburden layer by taking into account the weathering degree and integrity of rock mass whereas the excavated pilefoundation is preferred in highly weathered rock with overburden layer. It uses ANSYS to analyze the stress mechanism of theexcavated pile foundation in highly weathered rock with overburden layer and finds that such foundation presents bendingproperty under horizontal force.