weathered layer

the characteristic of weathered conglomerate layer is complex, which possesses a loose structure and low formation strength.

该种地层具有分布复杂，结构松散，岩层强度低的特点。

such low velocities are usually seen only near the surface in a zone called the weathered layer or the low-velocity layer.

这样低的速度通常只在地表附近称为风化层或低速层的地带中见到。

the results show that the shallow structures in the investigation area display three layers, which are sedimentary cover, strongly weathered layer and bedrock, respectively.

结果表明：探测区浅层为3层结构，分别为盖层、强风化层和基岩。

The inversion of quality factor Q of weathered layer is an important step in absorption compensation.

反演风化层的品质因数Q是补偿吸收作用的重要一步.

Weathered-layer Q-value inversion method with consideration of noise

一种考虑噪声干扰的地表风化层Q值反演方法

inversion of quality factor q for weathered layer using surface waves ── compensating seismic wave absorption in weathered layer to increase resolution

用面波反演风化层Q值&补偿风化层吸收提高分辨率

to raise wire-line drilling efficiency need to: 1.select casing diameter and depth according to drilling depth, diameter, strata drilled and rock integrity, structure features, weathered layer depth;

提高绳索取心钻进效率要做到：一是根据孔深、钻孔孔径、钻孔所遇地层及其岩性的完整程度、构造特点、风化带发育深度等选择套管的直径及下入深度；

analysis of construction risk on fully strong weathered layer on land at wutong end of xiamen xiang'an tunnel

厦门翔安隧道五通端陆域全强风化层施工风险分析

for this reason, the inversion of q-value for weathered layer is necessary.

本文利用面波来反演风化层的Q值。

compared with normal ground soil, strong weathered rock base has high bearing capacity, low compressibility and small deformation. when strong weathered rock layer is rather thick and groundwater table is very high, beam foundation under pillar is adopted.

强风化岩石地基相对一般地基土承载力高，压缩变形小，当强风化岩层较厚，地下水位很高，可采用柱下梁式基础。