静力触探在长距离输水线路勘察中的应用

2020-06-21 15:33:52马铁虎张永央
河南科技 2020年11期

马铁虎 张永央

摘 要:作为一种原位测试手段,静力触探经常应用于各行业的工程地质勘察工作中。相比标准贯入试验,它具有连续、快速、精确等特点,更能明确地反映地层竖向分布规律,在点状工程、面状工程中已得到较普遍的应用。但是,在跨多地貌单元的长距离线状工程中,其应用效果说法不一。本文以豫东平原上某累计长度约400 km的输水线路为例,简要分析双桥静力触探在长距离输水线路勘察中的应用。

关键词:双桥静力触探;标准贯入试验;长距离输水线路

Abstract: As an in-situ test method, static sounding is often used in engineering geological surveys in various industries. Compared with the standard penetration test, it has the characteristics of continuous, rapid and accurate, and can more clearly reflect the vertical distribution of the stratum, which has been widely used in point engineering and area engineering. However, in the long-distance linear project across multiple geomorphic units, the application effect is different. This paper took a water transmission line with a cumulative length of about 400 km on the East Henan Plain as an example, and briefly analyzed the application of double bridge static sounding in the investigation of long distance water transmission lines.

Keywords: static penetration test of double bridge;standard penetration test;long-distance water transmission line

雙桥静探试验工作的基本原理是采用准静力将触探头持续压入土层中,连续获取锥尖阻力([qc])和侧壁阻力([fs]),并计算出摩阻比([Rf])及地层比贯入阻力([Ps])。地质工程师通过采集到的数据绘制[qc]、[fs]、[Rf]曲线,直观地揭示竖向地层分布规律及各土层力学性质,进而进行地层编录、分层。大量的参考文献[1-3]和勘察实践表明,双桥静探试验划分地层的主要依据是参照《工程地质手册》将地层划分为砂土、粉土、粉质黏土、黏土,而水利工程传统上对于细粒土定名普遍采用《堤防工程地质勘察规程》(SL 188—2005)中土的三角坐标分类法,将地层划分为砂土、砂壤土、粉质壤土、壤土、粉质黏土、黏土。为使静力触探试验更好地在水利工程勘察中得到广泛应用,笔者将豫东某输水管线工程勘察过程中静力触探数据与钻探揭示的地层进行对比、分析、总结,简要论述其在长距离输水线路勘察中的应用。

1 概述

工程区位于豫东平原,地貌类型主要为黄淮冲积平原,地势平缓、开阔。……

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