Study on the surge formula system of typical dangerous rock mass collapse with different instability modes
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摘要:
峡谷区高陡危岩崩塌产生涌浪危害巨大,严重危及航道及景区安全;但危岩崩塌产生涌浪的系统性研究不够,针对性快速评估技术有待加强。本文旨在建立一个针对不同失稳模式的危岩体涌浪公式计算体系,以加强峡谷区高陡危岩崩塌产生涌浪灾害的快速评估技术。通过系统梳理了适用于危岩体不同失稳模式的涌浪计算公式,并建立了适用于不同失稳模式的危岩体涌浪全过程公式计算体系,以此体系为基础编制了危岩涌浪计算引擎。通过对典型压溃式龙门寨危岩体运用公式法计算体系进行涌浪计算,发现175 m水位时最大首浪高度为13.9 m,传播至2 km处传播浪高度为1.75 m,码头处爬高值为2.91 m,与数值模拟结果误差在20%以内,验证了计算体系的可行性,并进行了涌浪危险性分析。随后运用该计算体系对典型坠落式渔峡口危岩体和典型倾倒式巴西卡皮托利乌危岩体进行了涌浪计算,两者危岩体涌浪传播200 m后都进入低风险区域,体现了该计算体系在不同失稳模式下的应用情况。
Abstract:The collapse of high and steep dangerous rock in the gorge area produces huge surge hazards, which seriously endangers the safety of waterways and scenic spots. However, the systematic research on the surge caused by perilous rock collapse is not enough, and the targeted rapid assessment technology needs to be strengthened. The purpose of this paper is to establish a calculation system of dangerous rock surge formula for different instability modes, so as to strengthen the rapid assessment technology of surge disaster caused by high and steep dangerous rock collapse in canyon area. The surge calculation formulas suitable for different instability modes of perilous rock mass are systematically sorted out, and the calculation system of the whole process formula of perilous rock mass surge suitable for different instability modes is established. Based on this system, the calculation engine of perilous rock surge is compiled. By using the formula method to calculate the surge of the typical crushed Longmenzhai dangerous rock mass, it is found that the maximum first wave height is 13.9 m at 175 m water level, the propagation wave height is 1.75 m at 2 km, and the climbing height at the wharf is 2.91m. The error with the numerical simulation results is within 20 %, which verifies the feasibility of the calculation system and analyzes the surge risk. Then, the calculation system is used to calculate the surge of the typical falling Yuxiakou dangerous rock mass and the typical toppling Brazilian Capitoliu dangerous rock mass. Both dangerous rock masses enter the low-risk area after 200 m surge propagation, which reflects the calculation system under different instability modes.
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Keywords:
- dangerous rock mass /
- surge /
- formula method /
- surge calculation system /
- instability mode
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表 1 涌浪研究方法及优劣
Table 1 Surge research methods and advantages and disadvantages
方法 公式法 概化物理试验模型法 缩尺物理模型试验法 数值模拟法 准确度 中 中-高 高 高 时间 少 少 非常多 多 经费 低 低 非常高 中等 技术门槛 低 中等 高 高 表 2 最大首浪公式
Table 2 Part of propagation wave formula
表 3 部分传播浪公式
Table 3 Part of propagation wave formula
表 4 部分爬高浪公式
Table 4 Part of climbing wave formula
表 5 危岩体计算参数
Table 5 Calculation parameters of dangerous rock mass
符号 g hw v h1 h2 d a Vs 参数 重力加速度(m/s2) 水深(m) 入水速度(m/s) 高度(m) 基座高度(m) 宽度(m) 柱体高宽比 体积(万m³) 145m 9.8 65 27.1 190 12 40 4.75 30.4 175m 95 25.6 表 6 危岩体计算参数
Table 6 Calculation parameters of dangerous rock mass
符号 g hw v HS Vs 参数 重力加速度
(m/s2)水深
(m)入水速度
(m/s)平均厚度
(m)体积
(万m³)渔峡口危岩体 9.8 63 30 3 0.01 -
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