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香港元朗地区发育有大量的大理岩，它的力学性质直接影响该区的建筑安全。我们采用超声测量技术、单轴压缩试验和岩石薄片的镜下观测等方法了解其内部的结构变化及其力学性质。得出的结论是：该区的大理岩力学性质变化很大。一般的说，致密的黑色大理岩超声波速度高，抗压强度大且具有脆性特征，Ｐ波速度６．２～６．５ｋｍ·ｓ－１，Ｓ波速度３．０～３．６０ｋｍ·ｓ－１，抗压强度在８８～１６６ＭＰａ；而那些颗粒较粗的白色或灰色大理岩，超声波速度变化很大，抗压强度小且具有韧性特征，Ｐ波速度在４．２～６．９ｋｍ·ｓ－１，Ｓ波速度２．４～３．２０ｋｍ·ｓ－１，抗压强度在５２～６３ＭＰａ之间。Ｐ波速度与裂隙密度成反比关系。抗压强度与裂隙密度成线性反比关系，而且对脆性大理岩，其曲线斜率要比韧性大理岩的曲线斜率大出许多倍。大理岩内部的微观结构（如裂隙和颗粒大小等）是影响其力学性质的主要因素。
There is a large amount of marble in the Yuen Long area of Hong Kong. Its mechanical properties directly affect the construction safety of the area. We used ultrasonic measurement techniques, uniaxial compression tests, and microscopic observations of rock sheets to understand its internal structural changes and its mechanical properties. The conclusion is: The mechanical properties of marble in this area have changed greatly. In general, dense black marble has high ultrasonic velocity, high compressive strength and brittle characteristics, P wave velocity of 6.2 to 6.5 km·s-1, and S wave velocity of 3.0 to 3.60 km·s- 1, compressive strength of 88 ~ 166MPa; and those coarse particles of white or gray marble, ultrasonic speed changes, compressive strength is small and has tough characteristics, P wave speed of 4.2 ~ 6.9km · s -1, S-wave velocity is 2.4-3.20km-s-1, compressive strength is between 52-63MPa. The P wave velocity is inversely proportional to the crack density. There is a linear inverse relationship between compressive strength and fracture density, and for brittle marble, the slope of the curve is many times larger than that of ductile marble. The internal microstructure of marble (such as cracks and particle size) is the main factor affecting its mechanical properties.